Bump version: 0.30.2 → 0.31.0-beta.0

## Summary
- Update Rust Lance workspace dependencies to `v5.0.0-beta.4` using
`ci/set_lance_version.py` (including lockfile refresh).
- Update Java `lance-core` dependency property to `5.0.0-beta.4` in
`java/pom.xml`.

## Verification
- `cargo clippy --workspace --tests --all-features -- -D warnings`
- `cargo fmt --all`

## Triggering tag
- https://github.com/lance-format/lance/releases/tag/v5.0.0-beta.4

.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.27.1"
+current_version = "0.27.2"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.

.github/workflows/build_linux_wheel/action.yml

@@ -23,8 +23,10 @@ runs:
   steps:
     - name: CONFIRM ARM BUILD
       shell: bash
+      env:
+        ARM_BUILD: ${{ inputs.arm-build }}
       run: |
-        echo "ARM BUILD: ${{ inputs.arm-build }}"
+        echo "ARM BUILD: $ARM_BUILD"
     - name: Build x86_64 Manylinux wheel
       if: ${{ inputs.arm-build == 'false' }}
       uses: PyO3/maturin-action@v1

Cargo.toml

@@ -15,20 +15,20 @@ categories = ["database-implementations"]
 rust-version = "1.91.0"
 
 [workspace.dependencies]
-lance = { version = "=3.0.1", default-features = false }
-lance-core = { version = "=3.0.1" }
-lance-datagen = { version = "=3.0.1" }
-lance-file = { version = "=3.0.1" }
-lance-io = { version = "=3.0.1", default-features = false }
-lance-index = { version = "=3.0.1" }
-lance-linalg = { version = "=3.0.1" }
-lance-namespace = { version = "=3.0.1" }
-lance-namespace-impls = { version = "=3.0.1", default-features = false }
-lance-table = { version = "=3.0.1" }
-lance-testing = { version = "=3.0.1" }
-lance-datafusion = { version = "=3.0.1" }
-lance-encoding = { version = "=3.0.1" }
-lance-arrow = { version = "=3.0.1" }
+lance = { "version" = "=5.0.0-beta.4", default-features = false, "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-core = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-datagen = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-file = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-io = { "version" = "=5.0.0-beta.4", default-features = false, "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-index = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-linalg = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-namespace = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-namespace-impls = { "version" = "=5.0.0-beta.4", default-features = false, "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-table = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-testing = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-datafusion = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-encoding = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
+lance-arrow = { "version" = "=5.0.0-beta.4", "tag" = "v5.0.0-beta.4", "git" = "https://github.com/lance-format/lance.git" }
 ahash = "0.8"
 # Note that this one does not include pyarrow
 arrow = { version = "57.2", optional = false }

docs/src/java/java.md

@@ -14,7 +14,7 @@ Add the following dependency to your `pom.xml`:
 <dependency>
     <groupId>com.lancedb</groupId>
     <artifactId>lancedb-core</artifactId>
-    <version>0.27.1</version>
+    <version>0.27.2</version>
 </dependency>
 ```
 
@@ -57,32 +57,32 @@ LanceNamespace namespaceClient = LanceDbNamespaceClientBuilder.newBuilder()
 
 ## Metadata Operations
 
-### Creating a Namespace
+### Creating a Namespace Path
 
-Namespaces organize tables hierarchically. Create a namespace before creating tables within it:
+Namespace paths organize tables hierarchically. Create the desired namespace path before creating tables within it:
 
 ```java
 import org.lance.namespace.model.CreateNamespaceRequest;
 import org.lance.namespace.model.CreateNamespaceResponse;
 
-// Create a child namespace
+// Create a child namespace path
 CreateNamespaceRequest request = new CreateNamespaceRequest();
 request.setId(Arrays.asList("my_namespace"));
 
 CreateNamespaceResponse response = namespaceClient.createNamespace(request);
 ```
 
-You can also create nested namespaces:
+You can also create nested namespace paths:
 
 ```java
-// Create a nested namespace: parent/child
+// Create a nested namespace path: parent/child
 CreateNamespaceRequest request = new CreateNamespaceRequest();
 request.setId(Arrays.asList("parent_namespace", "child_namespace"));
 
 CreateNamespaceResponse response = namespaceClient.createNamespace(request);
 ```
 
-### Describing a Namespace
+### Describing a Namespace Path
 
 ```java
 import org.lance.namespace.model.DescribeNamespaceRequest;
@@ -95,22 +95,22 @@ DescribeNamespaceResponse response = namespaceClient.describeNamespace(request);
 System.out.println("Namespace properties: " + response.getProperties());
 ```
 
-### Listing Namespaces
+### Listing Namespace Paths
 
 ```java
 import org.lance.namespace.model.ListNamespacesRequest;
 import org.lance.namespace.model.ListNamespacesResponse;
 
-// List all namespaces at root level
+// List all namespace paths at the root level
 ListNamespacesRequest request = new ListNamespacesRequest();
 request.setId(Arrays.asList());  // Empty for root
 
 ListNamespacesResponse response = namespaceClient.listNamespaces(request);
 for (String ns : response.getNamespaces()) {
-    System.out.println("Namespace: " + ns);
+    System.out.println("Namespace path: " + ns);
 }
 
-// List child namespaces under a parent
+// List child namespace paths under a parent path
 ListNamespacesRequest childRequest = new ListNamespacesRequest();
 childRequest.setId(Arrays.asList("parent_namespace"));
 
@@ -123,7 +123,7 @@ ListNamespacesResponse childResponse = namespaceClient.listNamespaces(childReque
 import org.lance.namespace.model.ListTablesRequest;
 import org.lance.namespace.model.ListTablesResponse;
 
-// List tables in a namespace
+// List tables in a namespace path
 ListTablesRequest request = new ListTablesRequest();
 request.setId(Arrays.asList("my_namespace"));
 
@@ -133,7 +133,7 @@ for (String table : response.getTables()) {
 }
 ```
 
-### Dropping a Namespace
+### Dropping a Namespace Path
 
 ```java
 import org.lance.namespace.model.DropNamespaceRequest;
@@ -175,7 +175,7 @@ DropTableResponse response = namespaceClient.dropTable(request);
 
 ### Creating a Table
 
-Tables are created within a namespace by providing data in Apache Arrow IPC format:
+Tables are created within a namespace path by providing data in Apache Arrow IPC format:
 
 ```java
 import org.lance.namespace.LanceNamespace;
@@ -242,7 +242,7 @@ try (BufferAllocator allocator = new RootAllocator();
     }
     byte[] tableData = out.toByteArray();
 
-    // Create table in a namespace
+    // Create a table in a namespace path
     CreateTableRequest request = new CreateTableRequest();
     request.setId(Arrays.asList("my_namespace", "my_table"));
     CreateTableResponse response = namespaceClient.createTable(request, tableData);

docs/src/js/classes/Connection.md

@@ -61,8 +61,8 @@ sharing the same data, deletion, and index files.
 * **options.sourceVersion?**: `number`
     The version of the source table to clone.
 
-* **options.targetNamespace?**: `string`[]
-    The namespace for the target table (defaults to root namespace).
+* **options.targetNamespacePath?**: `string`[]
+    The namespace path for the target table (defaults to root namespace).
 
 #### Returns
 
@@ -116,13 +116,13 @@ Creates a new empty Table
 
 `Promise`<[`Table`](Table.md)>
 
-#### createEmptyTable(name, schema, namespace, options)
+#### createEmptyTable(name, schema, namespacePath, options)
 
 ```ts
 abstract createEmptyTable(
    name,
    schema,
-   namespace?,
+   namespacePath?,
    options?): Promise<Table>
 ```
 
@@ -136,8 +136,8 @@ Creates a new empty Table
 * **schema**: [`SchemaLike`](../type-aliases/SchemaLike.md)
     The schema of the table
 
-* **namespace?**: `string`[]
-    The namespace to create the table in (defaults to root namespace)
+* **namespacePath?**: `string`[]
+    The namespace path to create the table in (defaults to root namespace)
 
 * **options?**: `Partial`&lt;[`CreateTableOptions`](../interfaces/CreateTableOptions.md)&gt;
     Additional options
@@ -150,10 +150,10 @@ Creates a new empty Table
 
 ### createTable()
 
-#### createTable(options, namespace)
+#### createTable(options, namespacePath)
 
 ```ts
-abstract createTable(options, namespace?): Promise<Table>
+abstract createTable(options, namespacePath?): Promise<Table>
 ```
 
 Creates a new Table and initialize it with new data.
@@ -163,8 +163,8 @@ Creates a new Table and initialize it with new data.
 * **options**: `object` & `Partial`&lt;[`CreateTableOptions`](../interfaces/CreateTableOptions.md)&gt;
     The options object.
 
-* **namespace?**: `string`[]
-    The namespace to create the table in (defaults to root namespace)
+* **namespacePath?**: `string`[]
+    The namespace path to create the table in (defaults to root namespace)
 
 ##### Returns
 
@@ -197,13 +197,13 @@ Creates a new Table and initialize it with new data.
 
 `Promise`&lt;[`Table`](Table.md)&gt;
 
-#### createTable(name, data, namespace, options)
+#### createTable(name, data, namespacePath, options)
 
 ```ts
 abstract createTable(
    name,
    data,
-   namespace?,
+   namespacePath?,
    options?): Promise<Table>
 ```
 
@@ -218,8 +218,8 @@ Creates a new Table and initialize it with new data.
     Non-empty Array of Records
     to be inserted into the table
 
-* **namespace?**: `string`[]
-    The namespace to create the table in (defaults to root namespace)
+* **namespacePath?**: `string`[]
+    The namespace path to create the table in (defaults to root namespace)
 
 * **options?**: `Partial`&lt;[`CreateTableOptions`](../interfaces/CreateTableOptions.md)&gt;
     Additional options
@@ -247,15 +247,15 @@ Return a brief description of the connection
 ### dropAllTables()
 
 ```ts
-abstract dropAllTables(namespace?): Promise<void>
+abstract dropAllTables(namespacePath?): Promise<void>
 ```
 
 Drop all tables in the database.
 
 #### Parameters
 
-* **namespace?**: `string`[]
-    The namespace to drop tables from (defaults to root namespace).
+* **namespacePath?**: `string`[]
+    The namespace path to drop tables from (defaults to root namespace).
 
 #### Returns
 
@@ -266,7 +266,7 @@ Drop all tables in the database.
 ### dropTable()
 
 ```ts
-abstract dropTable(name, namespace?): Promise<void>
+abstract dropTable(name, namespacePath?): Promise<void>
 ```
 
 Drop an existing table.
@@ -276,8 +276,8 @@ Drop an existing table.
 * **name**: `string`
     The name of the table to drop.
 
-* **namespace?**: `string`[]
-    The namespace of the table (defaults to root namespace).
+* **namespacePath?**: `string`[]
+    The namespace path of the table (defaults to root namespace).
 
 #### Returns
 
@@ -304,7 +304,7 @@ Return true if the connection has not been closed
 ```ts
 abstract openTable(
    name,
-   namespace?,
+   namespacePath?,
    options?): Promise<Table>
 ```
 
@@ -315,8 +315,8 @@ Open a table in the database.
 * **name**: `string`
     The name of the table
 
-* **namespace?**: `string`[]
-    The namespace of the table (defaults to root namespace)
+* **namespacePath?**: `string`[]
+    The namespace path of the table (defaults to root namespace)
 
 * **options?**: `Partial`&lt;[`OpenTableOptions`](../interfaces/OpenTableOptions.md)&gt;
     Additional options
@@ -349,10 +349,10 @@ Tables will be returned in lexicographical order.
 
 `Promise`&lt;`string`[]&gt;
 
-#### tableNames(namespace, options)
+#### tableNames(namespacePath, options)
 
 ```ts
-abstract tableNames(namespace?, options?): Promise<string[]>
+abstract tableNames(namespacePath?, options?): Promise<string[]>
 ```
 
 List all the table names in this database.
@@ -361,8 +361,8 @@ Tables will be returned in lexicographical order.
 
 ##### Parameters
 
-* **namespace?**: `string`[]
-    The namespace to list tables from (defaults to root namespace)
+* **namespacePath?**: `string`[]
+    The namespace path to list tables from (defaults to root namespace)
 
 * **options?**: `Partial`&lt;[`TableNamesOptions`](../interfaces/TableNamesOptions.md)&gt;
     options to control the

docs/src/js/namespaces/embedding/classes/EmbeddingFunction.md

@@ -52,7 +52,7 @@ new EmbeddingFunction<T, M>(): EmbeddingFunction<T, M>
 ### computeQueryEmbeddings()
 
 ```ts
-computeQueryEmbeddings(data): Promise<number[] | Float32Array | Float64Array>
+computeQueryEmbeddings(data): Promise<number[] | Uint8Array | Float32Array | Float64Array>
 ```
 
 Compute the embeddings for a single query
@@ -63,7 +63,7 @@ Compute the embeddings for a single query
 
 #### Returns
 
-`Promise`&lt;`number`[] \| `Float32Array` \| `Float64Array`&gt;
+`Promise`&lt;`number`[] \| `Uint8Array` \| `Float32Array` \| `Float64Array`&gt;
 
 ***
 

docs/src/js/namespaces/embedding/classes/TextEmbeddingFunction.md

@@ -37,7 +37,7 @@ new TextEmbeddingFunction<M>(): TextEmbeddingFunction<M>
 ### computeQueryEmbeddings()
 
 ```ts
-computeQueryEmbeddings(data): Promise<number[] | Float32Array | Float64Array>
+computeQueryEmbeddings(data): Promise<number[] | Uint8Array | Float32Array | Float64Array>
 ```
 
 Compute the embeddings for a single query
@@ -48,7 +48,7 @@ Compute the embeddings for a single query
 
 #### Returns
 
-`Promise`&lt;`number`[] \| `Float32Array` \| `Float64Array`&gt;
+`Promise`&lt;`number`[] \| `Uint8Array` \| `Float32Array` \| `Float64Array`&gt;
 
 #### Overrides
 

docs/src/js/type-aliases/IntoVector.md

@@ -7,5 +7,10 @@
 # Type Alias: IntoVector
 
 ```ts
-type IntoVector: Float32Array | Float64Array | number[] | Promise<Float32Array | Float64Array | number[]>;
+type IntoVector:
+  | Float32Array
+  | Float64Array
+  | Uint8Array
+  | number[]
+  | Promise<Float32Array | Float64Array | Uint8Array | number[]>;
 ```

docs/src/python/python.md

@@ -36,6 +36,20 @@ is also an [asynchronous API client](#connections-asynchronous).
 
 ::: lancedb.table.Tags
 
+## Expressions
+
+Type-safe expression builder for filters and projections. Use these instead
+of raw SQL strings with [where][lancedb.query.LanceQueryBuilder.where] and
+[select][lancedb.query.LanceQueryBuilder.select].
+
+::: lancedb.expr.Expr
+
+::: lancedb.expr.col
+
+::: lancedb.expr.lit
+
+::: lancedb.expr.func
+
 ## Querying (Synchronous)
 
 ::: lancedb.query.Query

java/lancedb-core/pom.xml

@@ -8,7 +8,7 @@
     <parent>
       <groupId>com.lancedb</groupId>
       <artifactId>lancedb-parent</artifactId>
-      <version>0.27.1-final.0</version>
+      <version>0.27.2-final.0</version>
       <relativePath>../pom.xml</relativePath>
     </parent>
 

java/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.lancedb</groupId>
     <artifactId>lancedb-parent</artifactId>
-    <version>0.27.1-final.0</version>
+    <version>0.27.2-final.0</version>
     <packaging>pom</packaging>
     <name>${project.artifactId}</name>
     <description>LanceDB Java SDK Parent POM</description>
@@ -28,7 +28,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <arrow.version>15.0.0</arrow.version>
-        <lance-core.version>3.0.1</lance-core.version>
+        <lance-core.version>5.0.0-beta.4</lance-core.version>
         <spotless.skip>false</spotless.skip>
         <spotless.version>2.30.0</spotless.version>
         <spotless.java.googlejavaformat.version>1.7</spotless.java.googlejavaformat.version>

nodejs/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "lancedb-nodejs"
 edition.workspace = true
-version = "0.27.1"
+version = "0.27.2"
 license.workspace = true
 description.workspace = true
 repository.workspace = true
@@ -15,6 +15,8 @@ crate-type = ["cdylib"]
 async-trait.workspace = true
 arrow-ipc.workspace = true
 arrow-array.workspace = true
+arrow-buffer = "57.2"
+half.workspace = true
 arrow-schema.workspace = true
 env_logger.workspace = true
 futures.workspace = true

nodejs/__test__/table.test.ts

@@ -103,7 +103,7 @@ describe.each([arrow15, arrow16, arrow17, arrow18])(
         },
         numIndices: 0,
         numRows: 3,
-        totalBytes: 24,
+        totalBytes: 44,
       });
     });
 

nodejs/__test__/vector_types.test.ts

@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright The LanceDB Authors
+
+import * as tmp from "tmp";
+
+import { type Table, connect } from "../lancedb";
+import {
+  Field,
+  FixedSizeList,
+  Float32,
+  Int64,
+  Schema,
+  makeArrowTable,
+} from "../lancedb/arrow";
+
+describe("Vector query with different typed arrays", () => {
+  let tmpDir: tmp.DirResult;
+
+  afterEach(() => {
+    tmpDir?.removeCallback();
+  });
+
+  async function createFloat32Table(): Promise<Table> {
+    tmpDir = tmp.dirSync({ unsafeCleanup: true });
+    const db = await connect(tmpDir.name);
+    const schema = new Schema([
+      new Field("id", new Int64(), true),
+      new Field(
+        "vec",
+        new FixedSizeList(2, new Field("item", new Float32())),
+        true,
+      ),
+    ]);
+    const data = makeArrowTable(
+      [
+        { id: 1n, vec: [1.0, 0.0] },
+        { id: 2n, vec: [0.0, 1.0] },
+        { id: 3n, vec: [1.0, 1.0] },
+      ],
+      { schema },
+    );
+    return db.createTable("test_f32", data);
+  }
+
+  it("should search with Float32Array (baseline)", async () => {
+    const table = await createFloat32Table();
+    const results = await table
+      .query()
+      .nearestTo(new Float32Array([1.0, 0.0]))
+      .limit(1)
+      .toArray();
+
+    expect(results.length).toBe(1);
+    expect(Number(results[0].id)).toBe(1);
+  });
+
+  it("should search with number[] (backward compat)", async () => {
+    const table = await createFloat32Table();
+    const results = await table
+      .query()
+      .nearestTo([1.0, 0.0])
+      .limit(1)
+      .toArray();
+
+    expect(results.length).toBe(1);
+    expect(Number(results[0].id)).toBe(1);
+  });
+
+  it("should search with Float64Array via raw path", async () => {
+    const table = await createFloat32Table();
+    const results = await table
+      .query()
+      .nearestTo(new Float64Array([1.0, 0.0]))
+      .limit(1)
+      .toArray();
+
+    expect(results.length).toBe(1);
+    expect(Number(results[0].id)).toBe(1);
+  });
+
+  it("should add multiple query vectors with Float64Array", async () => {
+    const table = await createFloat32Table();
+    const results = await table
+      .query()
+      .nearestTo(new Float64Array([1.0, 0.0]))
+      .addQueryVector(new Float64Array([0.0, 1.0]))
+      .limit(2)
+      .toArray();
+
+    expect(results.length).toBeGreaterThanOrEqual(2);
+  });
+
+  // Float16Array is only available in Node 22+; not in TypeScript's standard lib yet
+  const float16ArrayCtor = (globalThis as unknown as Record<string, unknown>)
+    .Float16Array as (new (values: number[]) => unknown) | undefined;
+  const hasFloat16 = float16ArrayCtor !== undefined;
+  const f16it = hasFloat16 ? it : it.skip;
+
+  f16it("should search with Float16Array via raw path", async () => {
+    const table = await createFloat32Table();
+    const results = await table
+      .query()
+      .nearestTo(new float16ArrayCtor!([1.0, 0.0]) as Float32Array)
+      .limit(1)
+      .toArray();
+
+    expect(results.length).toBe(1);
+    expect(Number(results[0].id)).toBe(1);
+  });
+});

nodejs/lancedb/arrow.ts

@@ -117,8 +117,9 @@ export type TableLike =
 export type IntoVector =
   | Float32Array
   | Float64Array
+  | Uint8Array
   | number[]
-  | Promise<Float32Array | Float64Array | number[]>;
+  | Promise<Float32Array | Float64Array | Uint8Array | number[]>;
 
 export type MultiVector = IntoVector[];
 
@@ -126,14 +127,48 @@ export function isMultiVector(value: unknown): value is MultiVector {
   return Array.isArray(value) && isIntoVector(value[0]);
 }
 
+// Float16Array is not in TypeScript's standard lib yet; access dynamically
+type Float16ArrayCtor = new (
+  ...args: unknown[]
+) => { buffer: ArrayBuffer; byteOffset: number; byteLength: number };
+const float16ArrayCtor = (globalThis as unknown as Record<string, unknown>)
+  .Float16Array as Float16ArrayCtor | undefined;
+
 export function isIntoVector(value: unknown): value is IntoVector {
   return (
     value instanceof Float32Array ||
     value instanceof Float64Array ||
+    value instanceof Uint8Array ||
+    (float16ArrayCtor !== undefined && value instanceof float16ArrayCtor) ||
     (Array.isArray(value) && !Array.isArray(value[0]))
   );
 }
 
+/**
+ * Extract the underlying byte buffer and data type from a typed array
+ * for passing to the Rust NAPI layer without precision loss.
+ */
+export function extractVectorBuffer(
+  vector: Float32Array | Float64Array | Uint8Array,
+): { data: Uint8Array; dtype: string } | null {
+  if (float16ArrayCtor !== undefined && vector instanceof float16ArrayCtor) {
+    return {
+      data: new Uint8Array(vector.buffer, vector.byteOffset, vector.byteLength),
+      dtype: "float16",
+    };
+  }
+  if (vector instanceof Float64Array) {
+    return {
+      data: new Uint8Array(vector.buffer, vector.byteOffset, vector.byteLength),
+      dtype: "float64",
+    };
+  }
+  if (vector instanceof Uint8Array && !(vector instanceof Float32Array)) {
+    return { data: vector, dtype: "uint8" };
+  }
+  return null;
+}
+
 export function isArrowTable(value: object): value is TableLike {
   if (value instanceof ArrowTable) return true;
   return "schema" in value && "batches" in value;

nodejs/lancedb/connection.ts

@@ -166,25 +166,25 @@ export abstract class Connection {
    * List all the table names in this database.
    *
    * Tables will be returned in lexicographical order.
-   * @param {string[]} namespace - The namespace to list tables from (defaults to root namespace)
+   * @param {string[]} namespacePath - The namespace path to list tables from (defaults to root namespace)
    * @param {Partial<TableNamesOptions>} options - options to control the
    * paging / start point
    *
    */
   abstract tableNames(
-    namespace?: string[],
+    namespacePath?: string[],
     options?: Partial<TableNamesOptions>,
   ): Promise<string[]>;
 
   /**
    * Open a table in the database.
    * @param {string} name - The name of the table
-   * @param {string[]} namespace - The namespace of the table (defaults to root namespace)
+   * @param {string[]} namespacePath - The namespace path of the table (defaults to root namespace)
    * @param {Partial<OpenTableOptions>} options - Additional options
    */
   abstract openTable(
     name: string,
-    namespace?: string[],
+    namespacePath?: string[],
     options?: Partial<OpenTableOptions>,
   ): Promise<Table>;
 
@@ -193,7 +193,7 @@ export abstract class Connection {
    * @param {object} options - The options object.
    * @param {string} options.name - The name of the table.
    * @param {Data} options.data - Non-empty Array of Records to be inserted into the table
-   * @param {string[]} namespace - The namespace to create the table in (defaults to root namespace)
+   * @param {string[]} namespacePath - The namespace path to create the table in (defaults to root namespace)
    *
    */
   abstract createTable(
@@ -201,7 +201,7 @@ export abstract class Connection {
       name: string;
       data: Data;
     } & Partial<CreateTableOptions>,
-    namespace?: string[],
+    namespacePath?: string[],
   ): Promise<Table>;
   /**
    * Creates a new Table and initialize it with new data.
@@ -220,13 +220,13 @@ export abstract class Connection {
    * @param {string} name - The name of the table.
    * @param {Record<string, unknown>[] | TableLike} data - Non-empty Array of Records
    * to be inserted into the table
-   * @param {string[]} namespace - The namespace to create the table in (defaults to root namespace)
+   * @param {string[]} namespacePath - The namespace path to create the table in (defaults to root namespace)
    * @param {Partial<CreateTableOptions>} options - Additional options
    */
   abstract createTable(
     name: string,
     data: Record<string, unknown>[] | TableLike,
-    namespace?: string[],
+    namespacePath?: string[],
     options?: Partial<CreateTableOptions>,
   ): Promise<Table>;
 
@@ -245,28 +245,28 @@ export abstract class Connection {
    * Creates a new empty Table
    * @param {string} name - The name of the table.
    * @param {Schema} schema - The schema of the table
-   * @param {string[]} namespace - The namespace to create the table in (defaults to root namespace)
+   * @param {string[]} namespacePath - The namespace path to create the table in (defaults to root namespace)
    * @param {Partial<CreateTableOptions>} options - Additional options
    */
   abstract createEmptyTable(
     name: string,
     schema: import("./arrow").SchemaLike,
-    namespace?: string[],
+    namespacePath?: string[],
     options?: Partial<CreateTableOptions>,
   ): Promise<Table>;
 
   /**
    * Drop an existing table.
    * @param {string} name The name of the table to drop.
-   * @param {string[]} namespace The namespace of the table (defaults to root namespace).
+   * @param {string[]} namespacePath The namespace path of the table (defaults to root namespace).
    */
-  abstract dropTable(name: string, namespace?: string[]): Promise<void>;
+  abstract dropTable(name: string, namespacePath?: string[]): Promise<void>;
 
   /**
    * Drop all tables in the database.
-   * @param {string[]} namespace The namespace to drop tables from (defaults to root namespace).
+   * @param {string[]} namespacePath The namespace path to drop tables from (defaults to root namespace).
    */
-  abstract dropAllTables(namespace?: string[]): Promise<void>;
+  abstract dropAllTables(namespacePath?: string[]): Promise<void>;
 
   /**
    * Clone a table from a source table.
@@ -279,7 +279,7 @@ export abstract class Connection {
    * @param {string} targetTableName - The name of the target table to create.
    * @param {string} sourceUri - The URI of the source table to clone from.
    * @param {object} options - Clone options.
-   * @param {string[]} options.targetNamespace - The namespace for the target table (defaults to root namespace).
+   * @param {string[]} options.targetNamespacePath - The namespace path for the target table (defaults to root namespace).
    * @param {number} options.sourceVersion - The version of the source table to clone.
    * @param {string} options.sourceTag - The tag of the source table to clone.
    * @param {boolean} options.isShallow - Whether to perform a shallow clone (defaults to true).
@@ -288,7 +288,7 @@ export abstract class Connection {
     targetTableName: string,
     sourceUri: string,
     options?: {
-      targetNamespace?: string[];
+      targetNamespacePath?: string[];
       sourceVersion?: number;
       sourceTag?: string;
       isShallow?: boolean;
@@ -319,25 +319,25 @@ export class LocalConnection extends Connection {
   }
 
   async tableNames(
-    namespaceOrOptions?: string[] | Partial<TableNamesOptions>,
+    namespacePathOrOptions?: string[] | Partial<TableNamesOptions>,
     options?: Partial<TableNamesOptions>,
   ): Promise<string[]> {
-    // Detect if first argument is namespace array or options object
-    let namespace: string[] | undefined;
+    // Detect if first argument is namespacePath array or options object
+    let namespacePath: string[] | undefined;
     let tableNamesOptions: Partial<TableNamesOptions> | undefined;
 
-    if (Array.isArray(namespaceOrOptions)) {
-      // First argument is namespace array
-      namespace = namespaceOrOptions;
+    if (Array.isArray(namespacePathOrOptions)) {
+      // First argument is namespacePath array
+      namespacePath = namespacePathOrOptions;
       tableNamesOptions = options;
     } else {
       // First argument is options object (backwards compatibility)
-      namespace = undefined;
-      tableNamesOptions = namespaceOrOptions;
+      namespacePath = undefined;
+      tableNamesOptions = namespacePathOrOptions;
     }
 
     return this.inner.tableNames(
-      namespace ?? [],
+      namespacePath ?? [],
       tableNamesOptions?.startAfter,
       tableNamesOptions?.limit,
     );
@@ -345,12 +345,12 @@ export class LocalConnection extends Connection {
 
   async openTable(
     name: string,
-    namespace?: string[],
+    namespacePath?: string[],
     options?: Partial<OpenTableOptions>,
   ): Promise<Table> {
     const innerTable = await this.inner.openTable(
       name,
-      namespace ?? [],
+      namespacePath ?? [],
       cleanseStorageOptions(options?.storageOptions),
       options?.indexCacheSize,
     );
@@ -362,7 +362,7 @@ export class LocalConnection extends Connection {
     targetTableName: string,
     sourceUri: string,
     options?: {
-      targetNamespace?: string[];
+      targetNamespacePath?: string[];
       sourceVersion?: number;
       sourceTag?: string;
       isShallow?: boolean;
@@ -371,7 +371,7 @@ export class LocalConnection extends Connection {
     const innerTable = await this.inner.cloneTable(
       targetTableName,
       sourceUri,
-      options?.targetNamespace ?? [],
+      options?.targetNamespacePath ?? [],
       options?.sourceVersion ?? null,
       options?.sourceTag ?? null,
       options?.isShallow ?? true,
@@ -406,42 +406,42 @@ export class LocalConnection extends Connection {
     nameOrOptions:
       | string
       | ({ name: string; data: Data } & Partial<CreateTableOptions>),
-    dataOrNamespace?: Record<string, unknown>[] | TableLike | string[],
-    namespaceOrOptions?: string[] | Partial<CreateTableOptions>,
+    dataOrNamespacePath?: Record<string, unknown>[] | TableLike | string[],
+    namespacePathOrOptions?: string[] | Partial<CreateTableOptions>,
     options?: Partial<CreateTableOptions>,
   ): Promise<Table> {
     if (typeof nameOrOptions !== "string" && "name" in nameOrOptions) {
-      // First overload: createTable(options, namespace?)
+      // First overload: createTable(options, namespacePath?)
       const { name, data, ...createOptions } = nameOrOptions;
-      const namespace = dataOrNamespace as string[] | undefined;
-      return this._createTableImpl(name, data, namespace, createOptions);
+      const namespacePath = dataOrNamespacePath as string[] | undefined;
+      return this._createTableImpl(name, data, namespacePath, createOptions);
     }
 
-    // Second overload: createTable(name, data, namespace?, options?)
+    // Second overload: createTable(name, data, namespacePath?, options?)
     const name = nameOrOptions;
-    const data = dataOrNamespace as Record<string, unknown>[] | TableLike;
+    const data = dataOrNamespacePath as Record<string, unknown>[] | TableLike;
 
-    // Detect if third argument is namespace array or options object
-    let namespace: string[] | undefined;
+    // Detect if third argument is namespacePath array or options object
+    let namespacePath: string[] | undefined;
     let createOptions: Partial<CreateTableOptions> | undefined;
 
-    if (Array.isArray(namespaceOrOptions)) {
-      // Third argument is namespace array
-      namespace = namespaceOrOptions;
+    if (Array.isArray(namespacePathOrOptions)) {
+      // Third argument is namespacePath array
+      namespacePath = namespacePathOrOptions;
       createOptions = options;
     } else {
       // Third argument is options object (backwards compatibility)
-      namespace = undefined;
-      createOptions = namespaceOrOptions;
+      namespacePath = undefined;
+      createOptions = namespacePathOrOptions;
     }
 
-    return this._createTableImpl(name, data, namespace, createOptions);
+    return this._createTableImpl(name, data, namespacePath, createOptions);
   }
 
   private async _createTableImpl(
     name: string,
     data: Data,
-    namespace?: string[],
+    namespacePath?: string[],
     options?: Partial<CreateTableOptions>,
   ): Promise<Table> {
     if (data === undefined) {
@@ -455,7 +455,7 @@ export class LocalConnection extends Connection {
       name,
       buf,
       mode,
-      namespace ?? [],
+      namespacePath ?? [],
       storageOptions,
     );
 
@@ -465,21 +465,21 @@ export class LocalConnection extends Connection {
   async createEmptyTable(
     name: string,
     schema: import("./arrow").SchemaLike,
-    namespaceOrOptions?: string[] | Partial<CreateTableOptions>,
+    namespacePathOrOptions?: string[] | Partial<CreateTableOptions>,
     options?: Partial<CreateTableOptions>,
   ): Promise<Table> {
-    // Detect if third argument is namespace array or options object
-    let namespace: string[] | undefined;
+    // Detect if third argument is namespacePath array or options object
+    let namespacePath: string[] | undefined;
     let createOptions: Partial<CreateTableOptions> | undefined;
 
-    if (Array.isArray(namespaceOrOptions)) {
-      // Third argument is namespace array
-      namespace = namespaceOrOptions;
+    if (Array.isArray(namespacePathOrOptions)) {
+      // Third argument is namespacePath array
+      namespacePath = namespacePathOrOptions;
       createOptions = options;
     } else {
       // Third argument is options object (backwards compatibility)
-      namespace = undefined;
-      createOptions = namespaceOrOptions;
+      namespacePath = undefined;
+      createOptions = namespacePathOrOptions;
     }
 
     let mode: string = createOptions?.mode ?? "create";
@@ -502,18 +502,18 @@ export class LocalConnection extends Connection {
       name,
       buf,
       mode,
-      namespace ?? [],
+      namespacePath ?? [],
       storageOptions,
     );
     return new LocalTable(innerTable);
   }
 
-  async dropTable(name: string, namespace?: string[]): Promise<void> {
-    return this.inner.dropTable(name, namespace ?? []);
+  async dropTable(name: string, namespacePath?: string[]): Promise<void> {
+    return this.inner.dropTable(name, namespacePath ?? []);
   }
 
-  async dropAllTables(namespace?: string[]): Promise<void> {
-    return this.inner.dropAllTables(namespace ?? []);
+  async dropAllTables(namespacePath?: string[]): Promise<void> {
+    return this.inner.dropAllTables(namespacePath ?? []);
   }
 }
 

nodejs/lancedb/query.ts

@@ -5,6 +5,7 @@ import {
   Table as ArrowTable,
   type IntoVector,
   RecordBatch,
+  extractVectorBuffer,
   fromBufferToRecordBatch,
   fromRecordBatchToBuffer,
   tableFromIPC,
@@ -661,10 +662,8 @@ export class VectorQuery extends StandardQueryBase<NativeVectorQuery> {
       const res = (async () => {
         try {
           const v = await vector;
-          const arr = Float32Array.from(v);
-          //
           // biome-ignore lint/suspicious/noExplicitAny: we need to get the `inner`, but js has no package scoping
-          const value: any = this.addQueryVector(arr);
+          const value: any = this.addQueryVector(v);
           const inner = value.inner as
             | NativeVectorQuery
             | Promise<NativeVectorQuery>;
@@ -676,7 +675,12 @@ export class VectorQuery extends StandardQueryBase<NativeVectorQuery> {
       return new VectorQuery(res);
     } else {
       super.doCall((inner) => {
-        inner.addQueryVector(Float32Array.from(vector));
+        const raw = Array.isArray(vector) ? null : extractVectorBuffer(vector);
+        if (raw) {
+          inner.addQueryVectorRaw(raw.data, raw.dtype);
+        } else {
+          inner.addQueryVector(Float32Array.from(vector as number[]));
+        }
       });
       return this;
     }
@@ -765,14 +769,23 @@ export class Query extends StandardQueryBase<NativeQuery> {
    * a default `limit` of 10 will be used.  @see {@link Query#limit}
    */
   nearestTo(vector: IntoVector): VectorQuery {
+    const callNearestTo = (
+      inner: NativeQuery,
+      resolved: Float32Array | Float64Array | Uint8Array | number[],
+    ): NativeVectorQuery => {
+      const raw = Array.isArray(resolved)
+        ? null
+        : extractVectorBuffer(resolved);
+      if (raw) {
+        return inner.nearestToRaw(raw.data, raw.dtype);
+      }
+      return inner.nearestTo(Float32Array.from(resolved as number[]));
+    };
+
     if (this.inner instanceof Promise) {
       const nativeQuery = this.inner.then(async (inner) => {
-        if (vector instanceof Promise) {
-          const arr = await vector.then((v) => Float32Array.from(v));
-          return inner.nearestTo(arr);
-        } else {
-          return inner.nearestTo(Float32Array.from(vector));
-        }
+        const resolved = vector instanceof Promise ? await vector : vector;
+        return callNearestTo(inner, resolved);
       });
       return new VectorQuery(nativeQuery);
     }
@@ -780,10 +793,8 @@ export class Query extends StandardQueryBase<NativeQuery> {
       const res = (async () => {
         try {
           const v = await vector;
-          const arr = Float32Array.from(v);
-          //
           // biome-ignore lint/suspicious/noExplicitAny: we need to get the `inner`, but js has no package scoping
-          const value: any = this.nearestTo(arr);
+          const value: any = this.nearestTo(v);
           const inner = value.inner as
             | NativeVectorQuery
             | Promise<NativeVectorQuery>;
@@ -794,7 +805,7 @@ export class Query extends StandardQueryBase<NativeQuery> {
       })();
       return new VectorQuery(res);
     } else {
-      const vectorQuery = this.inner.nearestTo(Float32Array.from(vector));
+      const vectorQuery = callNearestTo(this.inner, vector);
       return new VectorQuery(vectorQuery);
     }
   }

nodejs/npm/darwin-arm64/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-darwin-arm64",
-	"version": "0.27.1",
+	"version": "0.27.2",
 	"os": ["darwin"],
 	"cpu": ["arm64"],
 	"main": "lancedb.darwin-arm64.node",

nodejs/npm/linux-arm64-gnu/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-linux-arm64-gnu",
-	"version": "0.27.1",
+	"version": "0.27.2",
 	"os": ["linux"],
 	"cpu": ["arm64"],
 	"main": "lancedb.linux-arm64-gnu.node",

nodejs/npm/linux-arm64-musl/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-linux-arm64-musl",
-	"version": "0.27.1",
+	"version": "0.27.2",
 	"os": ["linux"],
 	"cpu": ["arm64"],
 	"main": "lancedb.linux-arm64-musl.node",

nodejs/npm/linux-x64-gnu/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-linux-x64-gnu",
-	"version": "0.27.1",
+	"version": "0.27.2",
 	"os": ["linux"],
 	"cpu": ["x64"],
 	"main": "lancedb.linux-x64-gnu.node",

nodejs/npm/linux-x64-musl/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-linux-x64-musl",
-	"version": "0.27.1",
+	"version": "0.27.2",
 	"os": ["linux"],
 	"cpu": ["x64"],
 	"main": "lancedb.linux-x64-musl.node",

nodejs/npm/win32-arm64-msvc/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@lancedb/lancedb-win32-arm64-msvc",
-  "version": "0.27.1",
+  "version": "0.27.2",
   "os": [
     "win32"
   ],

nodejs/npm/win32-x64-msvc/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-win32-x64-msvc",
-	"version": "0.27.1",
+	"version": "0.27.2",
 	"os": ["win32"],
 	"cpu": ["x64"],
 	"main": "lancedb.win32-x64-msvc.node",

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@lancedb/lancedb",
-  "version": "0.27.1",
+  "version": "0.27.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@lancedb/lancedb",
-      "version": "0.27.1",
+      "version": "0.27.2",
       "cpu": [
         "x64",
         "arm64"

nodejs/package.json

@@ -11,7 +11,7 @@
     "ann"
   ],
   "private": false,
-  "version": "0.27.1",
+  "version": "0.27.2",
   "main": "dist/index.js",
   "exports": {
     ".": "./dist/index.js",

nodejs/src/connection.rs

@@ -119,12 +119,12 @@ impl Connection {
     #[napi(catch_unwind)]
     pub async fn table_names(
         &self,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         start_after: Option<String>,
         limit: Option<u32>,
     ) -> napi::Result<Vec<String>> {
         let mut op = self.get_inner()?.table_names();
-        op = op.namespace(namespace);
+        op = op.namespace(namespace_path.unwrap_or_default());
         if let Some(start_after) = start_after {
             op = op.start_after(start_after);
         }
@@ -146,7 +146,7 @@ impl Connection {
         name: String,
         buf: Buffer,
         mode: String,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         storage_options: Option<HashMap<String, String>>,
     ) -> napi::Result<Table> {
         let batches = ipc_file_to_batches(buf.to_vec())
@@ -154,7 +154,7 @@ impl Connection {
         let mode = Self::parse_create_mode_str(&mode)?;
         let mut builder = self.get_inner()?.create_table(&name, batches).mode(mode);
 
-        builder = builder.namespace(namespace);
+        builder = builder.namespace(namespace_path.unwrap_or_default());
 
         if let Some(storage_options) = storage_options {
             for (key, value) in storage_options {
@@ -171,7 +171,7 @@ impl Connection {
         name: String,
         schema_buf: Buffer,
         mode: String,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         storage_options: Option<HashMap<String, String>>,
     ) -> napi::Result<Table> {
         let schema = ipc_file_to_schema(schema_buf.to_vec()).map_err(|e| {
@@ -183,7 +183,7 @@ impl Connection {
             .create_empty_table(&name, schema)
             .mode(mode);
 
-        builder = builder.namespace(namespace);
+        builder = builder.namespace(namespace_path.unwrap_or_default());
 
         if let Some(storage_options) = storage_options {
             for (key, value) in storage_options {
@@ -198,13 +198,13 @@ impl Connection {
     pub async fn open_table(
         &self,
         name: String,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         storage_options: Option<HashMap<String, String>>,
         index_cache_size: Option<u32>,
     ) -> napi::Result<Table> {
         let mut builder = self.get_inner()?.open_table(&name);
 
-        builder = builder.namespace(namespace);
+        builder = builder.namespace(namespace_path.unwrap_or_default());
 
         if let Some(storage_options) = storage_options {
             for (key, value) in storage_options {
@@ -223,7 +223,7 @@ impl Connection {
         &self,
         target_table_name: String,
         source_uri: String,
-        target_namespace: Vec<String>,
+        target_namespace_path: Option<Vec<String>>,
         source_version: Option<i64>,
         source_tag: Option<String>,
         is_shallow: bool,
@@ -232,7 +232,7 @@ impl Connection {
             .get_inner()?
             .clone_table(&target_table_name, &source_uri);
 
-        builder = builder.target_namespace(target_namespace);
+        builder = builder.target_namespace(target_namespace_path.unwrap_or_default());
 
         if let Some(version) = source_version {
             builder = builder.source_version(version as u64);
@@ -250,18 +250,21 @@ impl Connection {
 
     /// Drop table with the name. Or raise an error if the table does not exist.
     #[napi(catch_unwind)]
-    pub async fn drop_table(&self, name: String, namespace: Vec<String>) -> napi::Result<()> {
+    pub async fn drop_table(
+        &self,
+        name: String,
+        namespace_path: Option<Vec<String>>,
+    ) -> napi::Result<()> {
+        let ns = namespace_path.unwrap_or_default();
         self.get_inner()?
-            .drop_table(&name, &namespace)
+            .drop_table(&name, &ns)
             .await
             .default_error()
     }
 
     #[napi(catch_unwind)]
-    pub async fn drop_all_tables(&self, namespace: Vec<String>) -> napi::Result<()> {
-        self.get_inner()?
-            .drop_all_tables(&namespace)
-            .await
-            .default_error()
+    pub async fn drop_all_tables(&self, namespace_path: Option<Vec<String>>) -> napi::Result<()> {
+        let ns = namespace_path.unwrap_or_default();
+        self.get_inner()?.drop_all_tables(&ns).await.default_error()
     }
 }

nodejs/src/query.rs

@@ -3,6 +3,12 @@
 
 use std::sync::Arc;
 
+use arrow_array::{
+    Array, Float16Array as ArrowFloat16Array, Float32Array as ArrowFloat32Array,
+    Float64Array as ArrowFloat64Array, UInt8Array as ArrowUInt8Array,
+};
+use arrow_buffer::ScalarBuffer;
+use half::f16;
 use lancedb::index::scalar::{
     BooleanQuery, BoostQuery, FtsQuery, FullTextSearchQuery, MatchQuery, MultiMatchQuery, Occur,
     Operator, PhraseQuery,
@@ -24,6 +30,33 @@ use crate::rerankers::RerankHybridCallbackArgs;
 use crate::rerankers::Reranker;
 use crate::util::{parse_distance_type, schema_to_buffer};
 
+fn bytes_to_arrow_array(data: Uint8Array, dtype: String) -> napi::Result<Arc<dyn Array>> {
+    let buf = arrow_buffer::Buffer::from(data.to_vec());
+    let num_bytes = buf.len();
+    match dtype.as_str() {
+        "float16" => {
+            let scalar_buf = ScalarBuffer::<f16>::new(buf, 0, num_bytes / 2);
+            Ok(Arc::new(ArrowFloat16Array::new(scalar_buf, None)))
+        }
+        "float32" => {
+            let scalar_buf = ScalarBuffer::<f32>::new(buf, 0, num_bytes / 4);
+            Ok(Arc::new(ArrowFloat32Array::new(scalar_buf, None)))
+        }
+        "float64" => {
+            let scalar_buf = ScalarBuffer::<f64>::new(buf, 0, num_bytes / 8);
+            Ok(Arc::new(ArrowFloat64Array::new(scalar_buf, None)))
+        }
+        "uint8" => {
+            let scalar_buf = ScalarBuffer::<u8>::new(buf, 0, num_bytes);
+            Ok(Arc::new(ArrowUInt8Array::new(scalar_buf, None)))
+        }
+        _ => Err(napi::Error::from_reason(format!(
+            "Unsupported vector dtype: {}. Expected one of: float16, float32, float64, uint8",
+            dtype
+        ))),
+    }
+}
+
 #[napi]
 pub struct Query {
     inner: LanceDbQuery,
@@ -78,6 +111,13 @@ impl Query {
         Ok(VectorQuery { inner })
     }
 
+    #[napi]
+    pub fn nearest_to_raw(&mut self, data: Uint8Array, dtype: String) -> Result<VectorQuery> {
+        let array = bytes_to_arrow_array(data, dtype)?;
+        let inner = self.inner.clone().nearest_to(array).default_error()?;
+        Ok(VectorQuery { inner })
+    }
+
     #[napi]
     pub fn fast_search(&mut self) {
         self.inner = self.inner.clone().fast_search();
@@ -163,6 +203,13 @@ impl VectorQuery {
         Ok(())
     }
 
+    #[napi]
+    pub fn add_query_vector_raw(&mut self, data: Uint8Array, dtype: String) -> Result<()> {
+        let array = bytes_to_arrow_array(data, dtype)?;
+        self.inner = self.inner.clone().add_query_vector(array).default_error()?;
+        Ok(())
+    }
+
     #[napi]
     pub fn distance_type(&mut self, distance_type: String) -> napi::Result<()> {
         let distance_type = parse_distance_type(distance_type)?;

python/.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.30.2-beta.0"
+current_version = "0.31.0-beta.0"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.

python/.gitignore

@@ -1,3 +1,5 @@
 # Test data created by some example tests
 data/
 _lancedb.pyd
+# macOS debug symbols bundle generated during build
+*.dSYM/

python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb-python"
-version = "0.30.2-beta.0"
+version = "0.31.0-beta.0"
 edition.workspace = true
 description = "Python bindings for LanceDB"
 license.workspace = true

python/pyproject.toml

@@ -45,7 +45,7 @@ repository = "https://github.com/lancedb/lancedb"
 
 [project.optional-dependencies]
 pylance = [
-    "pylance>=4.0.0b7",
+    "pylance>=5.0.0b3",
 ]
 tests = [
     "aiohttp>=3.9.0",
@@ -59,7 +59,7 @@ tests = [
     "polars>=0.19, <=1.3.0",
     "tantivy>=0.20.0",
     "pyarrow-stubs>=16.0",
-    "pylance>=4.0.0b7",
+    "pylance>=5.0.0b3",
     "requests>=2.31.0",
     "datafusion>=52,<53",
 ]

python/python/lancedb/__init__.py

@@ -6,7 +6,7 @@ import importlib.metadata
 import os
 from concurrent.futures import ThreadPoolExecutor
 from datetime import timedelta
-from typing import Dict, Optional, Union, Any
+from typing import Dict, Optional, Union, Any, List
 import warnings
 
 __version__ = importlib.metadata.version("lancedb")
@@ -15,9 +15,9 @@ from ._lancedb import connect as lancedb_connect
 from .common import URI, sanitize_uri
 from urllib.parse import urlparse
 from .db import AsyncConnection, DBConnection, LanceDBConnection
-from .io import StorageOptionsProvider
 from .remote import ClientConfig
 from .remote.db import RemoteDBConnection
+from .expr import Expr, col, lit, func
 from .schema import vector
 from .table import AsyncTable, Table
 from ._lancedb import Session
@@ -63,7 +63,7 @@ def _check_s3_bucket_with_dots(
 
 
 def connect(
-    uri: URI,
+    uri: Optional[URI] = None,
     *,
     api_key: Optional[str] = None,
     region: str = "us-east-1",
@@ -73,14 +73,18 @@ def connect(
     client_config: Union[ClientConfig, Dict[str, Any], None] = None,
     storage_options: Optional[Dict[str, str]] = None,
     session: Optional[Session] = None,
+    namespace_client_impl: Optional[str] = None,
+    namespace_client_properties: Optional[Dict[str, str]] = None,
+    namespace_client_pushdown_operations: Optional[List[str]] = None,
     **kwargs: Any,
 ) -> DBConnection:
     """Connect to a LanceDB database.
 
     Parameters
     ----------
-    uri: str or Path
-        The uri of the database.
+    uri: str or Path, optional
+        The uri of the database. When ``namespace_client_impl`` is provided you may
+        omit ``uri`` and connect through a namespace client instead.
     api_key: str, optional
         If presented, connect to LanceDB cloud.
         Otherwise, connect to a database on file system or cloud storage.
@@ -113,6 +117,18 @@ def connect(
         cache sizes for index and metadata caches, which can significantly
         impact memory use and performance. They can also be re-used across
         multiple connections to share the same cache state.
+    namespace_client_impl : str, optional
+        When provided along with ``namespace_client_properties``, ``connect``
+        returns a namespace-backed connection by delegating to
+        :func:`connect_namespace`. The value identifies which namespace
+        implementation to load (e.g., ``"dir"`` or ``"rest"``).
+    namespace_client_properties : dict, optional
+        Configuration to pass to the namespace client implementation. Required
+        when ``namespace_client_impl`` is set.
+    namespace_client_pushdown_operations : list[str], optional
+        Only used when ``namespace_client_properties`` is provided. Forwards to
+        :func:`connect_namespace` to control which operations are executed on the
+        namespace service (e.g., ``["QueryTable", "CreateTable"]``).
 
     Examples
     --------
@@ -132,11 +148,42 @@ def connect(
     >>> db = lancedb.connect("db://my_database", api_key="ldb_...",
     ...                      client_config={"retry_config": {"retries": 5}})
 
+    Connect to a namespace-backed database:
+
+    >>> db = lancedb.connect(namespace_client_impl="dir",
+    ...                      namespace_client_properties={"root": "/tmp/ns"})
+
     Returns
     -------
     conn : DBConnection
         A connection to a LanceDB database.
     """
+    if namespace_client_impl is not None or namespace_client_properties is not None:
+        if namespace_client_impl is None or namespace_client_properties is None:
+            raise ValueError(
+                "Both namespace_client_impl and "
+                "namespace_client_properties must be provided"
+            )
+        if kwargs:
+            raise ValueError(f"Unknown keyword arguments: {kwargs}")
+        return connect_namespace(
+            namespace_client_impl,
+            namespace_client_properties,
+            read_consistency_interval=read_consistency_interval,
+            storage_options=storage_options,
+            session=session,
+            namespace_client_pushdown_operations=namespace_client_pushdown_operations,
+        )
+
+    if namespace_client_pushdown_operations is not None:
+        raise ValueError(
+            "namespace_client_pushdown_operations is only valid when "
+            "connecting through a namespace"
+        )
+    if uri is None:
+        raise ValueError(
+            "uri is required when not connecting through a namespace client"
+        )
     if isinstance(uri, str) and uri.startswith("db://"):
         if api_key is None:
             api_key = os.environ.get("LANCEDB_API_KEY")
@@ -271,6 +318,10 @@ __all__ = [
     "AsyncConnection",
     "AsyncLanceNamespaceDBConnection",
     "AsyncTable",
+    "col",
+    "Expr",
+    "func",
+    "lit",
     "URI",
     "sanitize_uri",
     "vector",
@@ -279,7 +330,6 @@ __all__ = [
     "LanceNamespaceDBConnection",
     "RemoteDBConnection",
     "Session",
-    "StorageOptionsProvider",
     "Table",
     "__version__",
 ]

python/python/lancedb/_lancedb.pyi

@@ -14,7 +14,6 @@ from .index import (
     HnswSq,
     FTS,
 )
-from .io import StorageOptionsProvider
 from lance_namespace import (
     ListNamespacesResponse,
     CreateNamespaceResponse,
@@ -27,6 +26,32 @@ from .remote import ClientConfig
 IvfHnswPq: type[HnswPq] = HnswPq
 IvfHnswSq: type[HnswSq] = HnswSq
 
+class PyExpr:
+    """A type-safe DataFusion expression node (Rust-side handle)."""
+
+    def eq(self, other: "PyExpr") -> "PyExpr": ...
+    def ne(self, other: "PyExpr") -> "PyExpr": ...
+    def lt(self, other: "PyExpr") -> "PyExpr": ...
+    def lte(self, other: "PyExpr") -> "PyExpr": ...
+    def gt(self, other: "PyExpr") -> "PyExpr": ...
+    def gte(self, other: "PyExpr") -> "PyExpr": ...
+    def and_(self, other: "PyExpr") -> "PyExpr": ...
+    def or_(self, other: "PyExpr") -> "PyExpr": ...
+    def not_(self) -> "PyExpr": ...
+    def add(self, other: "PyExpr") -> "PyExpr": ...
+    def sub(self, other: "PyExpr") -> "PyExpr": ...
+    def mul(self, other: "PyExpr") -> "PyExpr": ...
+    def div(self, other: "PyExpr") -> "PyExpr": ...
+    def lower(self) -> "PyExpr": ...
+    def upper(self) -> "PyExpr": ...
+    def contains(self, substr: "PyExpr") -> "PyExpr": ...
+    def cast(self, data_type: pa.DataType) -> "PyExpr": ...
+    def to_sql(self) -> str: ...
+
+def expr_col(name: str) -> PyExpr: ...
+def expr_lit(value: Union[bool, int, float, str]) -> PyExpr: ...
+def expr_func(name: str, args: List[PyExpr]) -> PyExpr: ...
+
 class Session:
     def __init__(
         self,
@@ -46,35 +71,35 @@ class Connection(object):
     async def close(self): ...
     async def list_namespaces(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListNamespacesResponse: ...
     async def create_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         properties: Optional[Dict[str, str]] = None,
     ) -> CreateNamespaceResponse: ...
     async def drop_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         behavior: Optional[str] = None,
     ) -> DropNamespaceResponse: ...
     async def describe_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
     ) -> DescribeNamespaceResponse: ...
     async def list_tables(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListTablesResponse: ...
     async def table_names(
         self,
-        namespace: Optional[List[str]],
+        namespace_path: Optional[List[str]],
         start_after: Optional[str],
         limit: Optional[int],
     ) -> list[str]: ...  # Deprecated: Use list_tables instead
@@ -83,9 +108,8 @@ class Connection(object):
         name: str,
         mode: str,
         data: pa.RecordBatchReader,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional[StorageOptionsProvider] = None,
         location: Optional[str] = None,
     ) -> Table: ...
     async def create_empty_table(
@@ -93,17 +117,15 @@ class Connection(object):
         name: str,
         mode: str,
         schema: pa.Schema,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional[StorageOptionsProvider] = None,
         location: Optional[str] = None,
     ) -> Table: ...
     async def open_table(
         self,
         name: str,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional[StorageOptionsProvider] = None,
         index_cache_size: Optional[int] = None,
         location: Optional[str] = None,
     ) -> Table: ...
@@ -111,7 +133,7 @@ class Connection(object):
         self,
         target_table_name: str,
         source_uri: str,
-        target_namespace: Optional[List[str]] = None,
+        target_namespace_path: Optional[List[str]] = None,
         source_version: Optional[int] = None,
         source_tag: Optional[str] = None,
         is_shallow: bool = True,
@@ -120,13 +142,15 @@ class Connection(object):
         self,
         cur_name: str,
         new_name: str,
-        cur_namespace: Optional[List[str]] = None,
-        new_namespace: Optional[List[str]] = None,
+        cur_namespace_path: Optional[List[str]] = None,
+        new_namespace_path: Optional[List[str]] = None,
     ) -> None: ...
     async def drop_table(
-        self, name: str, namespace: Optional[List[str]] = None
+        self, name: str, namespace_path: Optional[List[str]] = None
+    ) -> None: ...
+    async def drop_all_tables(
+        self, namespace_path: Optional[List[str]] = None
     ) -> None: ...
-    async def drop_all_tables(self, namespace: Optional[List[str]] = None) -> None: ...
 
 class Table:
     def name(self) -> str: ...
@@ -225,7 +249,9 @@ class RecordBatchStream:
 
 class Query:
     def where(self, filter: str): ...
-    def select(self, columns: Tuple[str, str]): ...
+    def where_expr(self, expr: PyExpr): ...
+    def select(self, columns: List[Tuple[str, str]]): ...
+    def select_expr(self, columns: List[Tuple[str, PyExpr]]): ...
     def select_columns(self, columns: List[str]): ...
     def limit(self, limit: int): ...
     def offset(self, offset: int): ...
@@ -251,7 +277,9 @@ class TakeQuery:
 
 class FTSQuery:
     def where(self, filter: str): ...
-    def select(self, columns: List[str]): ...
+    def where_expr(self, expr: PyExpr): ...
+    def select(self, columns: List[Tuple[str, str]]): ...
+    def select_expr(self, columns: List[Tuple[str, PyExpr]]): ...
     def limit(self, limit: int): ...
     def offset(self, offset: int): ...
     def fast_search(self): ...
@@ -270,7 +298,9 @@ class VectorQuery:
     async def output_schema(self) -> pa.Schema: ...
     async def execute(self) -> RecordBatchStream: ...
     def where(self, filter: str): ...
-    def select(self, columns: List[str]): ...
+    def where_expr(self, expr: PyExpr): ...
+    def select(self, columns: List[Tuple[str, str]]): ...
+    def select_expr(self, columns: List[Tuple[str, PyExpr]]): ...
     def select_with_projection(self, columns: Tuple[str, str]): ...
     def limit(self, limit: int): ...
     def offset(self, offset: int): ...
@@ -287,7 +317,9 @@ class VectorQuery:
 
 class HybridQuery:
     def where(self, filter: str): ...
-    def select(self, columns: List[str]): ...
+    def where_expr(self, expr: PyExpr): ...
+    def select(self, columns: List[Tuple[str, str]]): ...
+    def select_expr(self, columns: List[Tuple[str, PyExpr]]): ...
     def limit(self, limit: int): ...
     def offset(self, offset: int): ...
     def fast_search(self): ...

python/python/lancedb/db.py

@@ -52,7 +52,6 @@ if TYPE_CHECKING:
     from ._lancedb import Connection as LanceDbConnection
     from .common import DATA, URI
     from .embeddings import EmbeddingFunctionConfig
-    from .io import StorageOptionsProvider
     from ._lancedb import Session
 
 from .namespace_utils import (
@@ -67,7 +66,7 @@ class DBConnection(EnforceOverrides):
 
     def list_namespaces(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListNamespacesResponse:
@@ -75,7 +74,7 @@ class DBConnection(EnforceOverrides):
 
         Parameters
         ----------
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The parent namespace to list namespaces in.
             Empty list represents root namespace.
         page_token: str, optional
@@ -89,13 +88,13 @@ class DBConnection(EnforceOverrides):
         ListNamespacesResponse
             Response containing namespace names and optional page_token for pagination.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return ListNamespacesResponse(namespaces=[], page_token=None)
 
     def create_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         properties: Optional[Dict[str, str]] = None,
     ) -> CreateNamespaceResponse:
@@ -103,7 +102,7 @@ class DBConnection(EnforceOverrides):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to create.
         mode: str, optional
             Creation mode - "create" (fail if exists), "exist_ok" (skip if exists),
@@ -122,7 +121,7 @@ class DBConnection(EnforceOverrides):
 
     def drop_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         behavior: Optional[str] = None,
     ) -> DropNamespaceResponse:
@@ -130,7 +129,7 @@ class DBConnection(EnforceOverrides):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to drop.
         mode: str, optional
             Whether to skip if not exists ("SKIP") or fail ("FAIL"). Case insensitive.
@@ -147,12 +146,14 @@ class DBConnection(EnforceOverrides):
             "Namespace operations are not supported for this connection type"
         )
 
-    def describe_namespace(self, namespace: List[str]) -> DescribeNamespaceResponse:
+    def describe_namespace(
+        self, namespace_path: List[str]
+    ) -> DescribeNamespaceResponse:
         """Describe a namespace.
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to describe.
 
         Returns
@@ -166,7 +167,7 @@ class DBConnection(EnforceOverrides):
 
     def list_tables(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListTablesResponse:
@@ -174,7 +175,7 @@ class DBConnection(EnforceOverrides):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to list tables in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -198,13 +199,13 @@ class DBConnection(EnforceOverrides):
         page_token: Optional[str] = None,
         limit: int = 10,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
     ) -> Iterable[str]:
         """List all tables in this database, in sorted order
 
         Parameters
         ----------
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The namespace to list tables in.
             Empty list represents root namespace.
         page_token: str, optional
@@ -231,9 +232,8 @@ class DBConnection(EnforceOverrides):
         fill_value: float = 0.0,
         embedding_functions: Optional[List[EmbeddingFunctionConfig]] = None,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         data_storage_version: Optional[str] = None,
         enable_v2_manifest_paths: Optional[bool] = None,
     ) -> Table:
@@ -243,7 +243,7 @@ class DBConnection(EnforceOverrides):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The namespace to create the table in.
             Empty list represents root namespace.
         data: The data to initialize the table, *optional*
@@ -401,9 +401,8 @@ class DBConnection(EnforceOverrides):
         self,
         name: str,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         index_cache_size: Optional[int] = None,
     ) -> Table:
         """Open a Lance Table in the database.
@@ -412,7 +411,7 @@ class DBConnection(EnforceOverrides):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to open the table from.
             None or empty list represents root namespace.
         index_cache_size: int, default 256
@@ -440,27 +439,27 @@ class DBConnection(EnforceOverrides):
         """
         raise NotImplementedError
 
-    def drop_table(self, name: str, namespace: Optional[List[str]] = None):
+    def drop_table(self, name: str, namespace_path: Optional[List[str]] = None):
         """Drop a table from the database.
 
         Parameters
         ----------
         name: str
             The name of the table.
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The namespace to drop the table from.
             Empty list represents root namespace.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         raise NotImplementedError
 
     def rename_table(
         self,
         cur_name: str,
         new_name: str,
-        cur_namespace: Optional[List[str]] = None,
-        new_namespace: Optional[List[str]] = None,
+        cur_namespace_path: Optional[List[str]] = None,
+        new_namespace_path: Optional[List[str]] = None,
     ):
         """Rename a table in the database.
 
@@ -470,17 +469,17 @@ class DBConnection(EnforceOverrides):
             The current name of the table.
         new_name: str
             The new name of the table.
-        cur_namespace: List[str], optional
+        cur_namespace_path: List[str], optional
             The namespace of the current table.
             None or empty list represents root namespace.
-        new_namespace: List[str], optional
+        new_namespace_path: List[str], optional
             The namespace to move the table to.
             If not specified, defaults to the same as cur_namespace.
         """
-        if cur_namespace is None:
-            cur_namespace = []
-        if new_namespace is None:
-            new_namespace = []
+        if cur_namespace_path is None:
+            cur_namespace_path = []
+        if new_namespace_path is None:
+            new_namespace_path = []
         raise NotImplementedError
 
     def drop_database(self):
@@ -490,18 +489,18 @@ class DBConnection(EnforceOverrides):
         """
         raise NotImplementedError
 
-    def drop_all_tables(self, namespace: Optional[List[str]] = None):
+    def drop_all_tables(self, namespace_path: Optional[List[str]] = None):
         """
         Drop all tables from the database
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to drop all tables from.
             None or empty list represents root namespace.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         raise NotImplementedError
 
     @property
@@ -642,7 +641,7 @@ class LanceDBConnection(DBConnection):
     @override
     def list_namespaces(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListNamespacesResponse:
@@ -650,7 +649,7 @@ class LanceDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The parent namespace to list namespaces in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -664,18 +663,18 @@ class LanceDBConnection(DBConnection):
         ListNamespacesResponse
             Response containing namespace names and optional page_token for pagination.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return LOOP.run(
             self._conn.list_namespaces(
-                namespace=namespace, page_token=page_token, limit=limit
+                namespace_path=namespace_path, page_token=page_token, limit=limit
             )
         )
 
     @override
     def create_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         properties: Optional[Dict[str, str]] = None,
     ) -> CreateNamespaceResponse:
@@ -683,7 +682,7 @@ class LanceDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to create.
         mode: str, optional
             Creation mode - "create" (fail if exists), "exist_ok" (skip if exists),
@@ -698,14 +697,14 @@ class LanceDBConnection(DBConnection):
         """
         return LOOP.run(
             self._conn.create_namespace(
-                namespace=namespace, mode=mode, properties=properties
+                namespace_path=namespace_path, mode=mode, properties=properties
             )
         )
 
     @override
     def drop_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         behavior: Optional[str] = None,
     ) -> DropNamespaceResponse:
@@ -713,7 +712,7 @@ class LanceDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to drop.
         mode: str, optional
             Whether to skip if not exists ("SKIP") or fail ("FAIL"). Case insensitive.
@@ -727,16 +726,20 @@ class LanceDBConnection(DBConnection):
             Response containing properties and transaction_id if applicable.
         """
         return LOOP.run(
-            self._conn.drop_namespace(namespace=namespace, mode=mode, behavior=behavior)
+            self._conn.drop_namespace(
+                namespace_path=namespace_path, mode=mode, behavior=behavior
+            )
         )
 
     @override
-    def describe_namespace(self, namespace: List[str]) -> DescribeNamespaceResponse:
+    def describe_namespace(
+        self, namespace_path: List[str]
+    ) -> DescribeNamespaceResponse:
         """Describe a namespace.
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to describe.
 
         Returns
@@ -744,12 +747,12 @@ class LanceDBConnection(DBConnection):
         DescribeNamespaceResponse
             Response containing the namespace properties.
         """
-        return LOOP.run(self._conn.describe_namespace(namespace=namespace))
+        return LOOP.run(self._conn.describe_namespace(namespace_path=namespace_path))
 
     @override
     def list_tables(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListTablesResponse:
@@ -757,7 +760,7 @@ class LanceDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to list tables in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -771,11 +774,11 @@ class LanceDBConnection(DBConnection):
         ListTablesResponse
             Response containing table names and optional page_token for pagination.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return LOOP.run(
             self._conn.list_tables(
-                namespace=namespace, page_token=page_token, limit=limit
+                namespace_path=namespace_path, page_token=page_token, limit=limit
             )
         )
 
@@ -785,7 +788,7 @@ class LanceDBConnection(DBConnection):
         page_token: Optional[str] = None,
         limit: int = 10,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
     ) -> Iterable[str]:
         """Get the names of all tables in the database. The names are sorted.
 
@@ -794,7 +797,7 @@ class LanceDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to list tables in.
         page_token: str, optional
             The token to use for pagination.
@@ -813,11 +816,11 @@ class LanceDBConnection(DBConnection):
             DeprecationWarning,
             stacklevel=2,
         )
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return LOOP.run(
             self._conn.table_names(
-                namespace=namespace, start_after=page_token, limit=limit
+                namespace_path=namespace_path, start_after=page_token, limit=limit
             )
         )
 
@@ -839,9 +842,8 @@ class LanceDBConnection(DBConnection):
         fill_value: float = 0.0,
         embedding_functions: Optional[List[EmbeddingFunctionConfig]] = None,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         data_storage_version: Optional[str] = None,
         enable_v2_manifest_paths: Optional[bool] = None,
     ) -> LanceTable:
@@ -849,15 +851,15 @@ class LanceDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to create the table in.
 
         See
         ---
         DBConnection.create_table
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         if mode.lower() not in ["create", "overwrite"]:
             raise ValueError("mode must be either 'create' or 'overwrite'")
         validate_table_name(name)
@@ -872,9 +874,8 @@ class LanceDBConnection(DBConnection):
             on_bad_vectors=on_bad_vectors,
             fill_value=fill_value,
             embedding_functions=embedding_functions,
-            namespace=namespace,
+            namespace_path=namespace_path,
             storage_options=storage_options,
-            storage_options_provider=storage_options_provider,
         )
         return tbl
 
@@ -883,9 +884,8 @@ class LanceDBConnection(DBConnection):
         self,
         name: str,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         index_cache_size: Optional[int] = None,
     ) -> LanceTable:
         """Open a table in the database.
@@ -894,15 +894,15 @@ class LanceDBConnection(DBConnection):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to open the table from.
 
         Returns
         -------
         A LanceTable object representing the table.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         if index_cache_size is not None:
             import warnings
 
@@ -917,9 +917,8 @@ class LanceDBConnection(DBConnection):
         return LanceTable.open(
             self,
             name,
-            namespace=namespace,
+            namespace_path=namespace_path,
             storage_options=storage_options,
-            storage_options_provider=storage_options_provider,
             index_cache_size=index_cache_size,
         )
 
@@ -928,7 +927,7 @@ class LanceDBConnection(DBConnection):
         target_table_name: str,
         source_uri: str,
         *,
-        target_namespace: Optional[List[str]] = None,
+        target_namespace_path: Optional[List[str]] = None,
         source_version: Optional[int] = None,
         source_tag: Optional[str] = None,
         is_shallow: bool = True,
@@ -946,7 +945,7 @@ class LanceDBConnection(DBConnection):
             The name of the target table to create.
         source_uri: str
             The URI of the source table to clone from.
-        target_namespace: List[str], optional
+        target_namespace_path: List[str], optional
             The namespace for the target table.
             None or empty list represents root namespace.
         source_version: int, optional
@@ -961,13 +960,13 @@ class LanceDBConnection(DBConnection):
         -------
         A LanceTable object representing the cloned table.
         """
-        if target_namespace is None:
-            target_namespace = []
+        if target_namespace_path is None:
+            target_namespace_path = []
         LOOP.run(
             self._conn.clone_table(
                 target_table_name,
                 source_uri,
-                target_namespace=target_namespace,
+                target_namespace_path=target_namespace_path,
                 source_version=source_version,
                 source_tag=source_tag,
                 is_shallow=is_shallow,
@@ -976,14 +975,14 @@ class LanceDBConnection(DBConnection):
         return LanceTable.open(
             self,
             target_table_name,
-            namespace=target_namespace,
+            namespace_path=target_namespace_path,
         )
 
     @override
     def drop_table(
         self,
         name: str,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         ignore_missing: bool = False,
     ):
         """Drop a table from the database.
@@ -992,32 +991,32 @@ class LanceDBConnection(DBConnection):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to drop the table from.
         ignore_missing: bool, default False
             If True, ignore if the table does not exist.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         LOOP.run(
             self._conn.drop_table(
-                name, namespace=namespace, ignore_missing=ignore_missing
+                name, namespace_path=namespace_path, ignore_missing=ignore_missing
             )
         )
 
     @override
-    def drop_all_tables(self, namespace: Optional[List[str]] = None):
-        if namespace is None:
-            namespace = []
-        LOOP.run(self._conn.drop_all_tables(namespace=namespace))
+    def drop_all_tables(self, namespace_path: Optional[List[str]] = None):
+        if namespace_path is None:
+            namespace_path = []
+        LOOP.run(self._conn.drop_all_tables(namespace_path=namespace_path))
 
     @override
     def rename_table(
         self,
         cur_name: str,
         new_name: str,
-        cur_namespace: Optional[List[str]] = None,
-        new_namespace: Optional[List[str]] = None,
+        cur_namespace_path: Optional[List[str]] = None,
+        new_namespace_path: Optional[List[str]] = None,
     ):
         """Rename a table in the database.
 
@@ -1027,21 +1026,21 @@ class LanceDBConnection(DBConnection):
             The current name of the table.
         new_name: str
             The new name of the table.
-        cur_namespace: List[str], optional
+        cur_namespace_path: List[str], optional
             The namespace of the current table.
-        new_namespace: List[str], optional
+        new_namespace_path: List[str], optional
             The namespace to move the table to.
         """
-        if cur_namespace is None:
-            cur_namespace = []
-        if new_namespace is None:
-            new_namespace = []
+        if cur_namespace_path is None:
+            cur_namespace_path = []
+        if new_namespace_path is None:
+            new_namespace_path = []
         LOOP.run(
             self._conn.rename_table(
                 cur_name,
                 new_name,
-                cur_namespace=cur_namespace,
-                new_namespace=new_namespace,
+                cur_namespace_path=cur_namespace_path,
+                new_namespace_path=new_namespace_path,
             )
         )
 
@@ -1125,7 +1124,7 @@ class AsyncConnection(object):
 
     async def list_namespaces(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListNamespacesResponse:
@@ -1133,7 +1132,7 @@ class AsyncConnection(object):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The parent namespace to list namespaces in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -1146,16 +1145,16 @@ class AsyncConnection(object):
         ListNamespacesResponse
             Response containing namespace names and optional pagination token
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         result = await self._inner.list_namespaces(
-            namespace=namespace, page_token=page_token, limit=limit
+            namespace_path=namespace_path, page_token=page_token, limit=limit
         )
         return ListNamespacesResponse(**result)
 
     async def create_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         properties: Optional[Dict[str, str]] = None,
     ) -> CreateNamespaceResponse:
@@ -1163,7 +1162,7 @@ class AsyncConnection(object):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to create.
         mode: str, optional
             Creation mode - "create", "exist_ok", or "overwrite". Case insensitive.
@@ -1176,7 +1175,7 @@ class AsyncConnection(object):
             Response containing namespace properties
         """
         result = await self._inner.create_namespace(
-            namespace,
+            namespace_path,
             mode=_normalize_create_namespace_mode(mode),
             properties=properties,
         )
@@ -1184,7 +1183,7 @@ class AsyncConnection(object):
 
     async def drop_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         behavior: Optional[str] = None,
     ) -> DropNamespaceResponse:
@@ -1192,7 +1191,7 @@ class AsyncConnection(object):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to drop.
         mode: str, optional
             Whether to skip if not exists ("SKIP") or fail ("FAIL"). Case insensitive.
@@ -1206,20 +1205,20 @@ class AsyncConnection(object):
             Response containing properties and transaction_id if applicable.
         """
         result = await self._inner.drop_namespace(
-            namespace,
+            namespace_path,
             mode=_normalize_drop_namespace_mode(mode),
             behavior=_normalize_drop_namespace_behavior(behavior),
         )
         return DropNamespaceResponse(**result)
 
     async def describe_namespace(
-        self, namespace: List[str]
+        self, namespace_path: List[str]
     ) -> DescribeNamespaceResponse:
         """Describe a namespace.
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to describe.
 
         Returns
@@ -1227,12 +1226,12 @@ class AsyncConnection(object):
         DescribeNamespaceResponse
             Response containing the namespace properties.
         """
-        result = await self._inner.describe_namespace(namespace)
+        result = await self._inner.describe_namespace(namespace_path)
         return DescribeNamespaceResponse(**result)
 
     async def list_tables(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListTablesResponse:
@@ -1240,7 +1239,7 @@ class AsyncConnection(object):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to list tables in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -1254,17 +1253,17 @@ class AsyncConnection(object):
         ListTablesResponse
             Response containing table names and optional page_token for pagination.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         result = await self._inner.list_tables(
-            namespace=namespace, page_token=page_token, limit=limit
+            namespace_path=namespace_path, page_token=page_token, limit=limit
         )
         return ListTablesResponse(**result)
 
     async def table_names(
         self,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         start_after: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> Iterable[str]:
@@ -1275,7 +1274,7 @@ class AsyncConnection(object):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to list tables in.
             None or empty list represents root namespace.
         start_after: str, optional
@@ -1298,10 +1297,10 @@ class AsyncConnection(object):
             DeprecationWarning,
             stacklevel=2,
         )
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return await self._inner.table_names(
-            namespace=namespace, start_after=start_after, limit=limit
+            namespace_path=namespace_path, start_after=start_after, limit=limit
         )
 
     async def create_table(
@@ -1314,9 +1313,8 @@ class AsyncConnection(object):
         on_bad_vectors: Optional[str] = None,
         fill_value: Optional[float] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         embedding_functions: Optional[List[EmbeddingFunctionConfig]] = None,
         location: Optional[str] = None,
     ) -> AsyncTable:
@@ -1326,7 +1324,7 @@ class AsyncConnection(object):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The namespace to create the table in.
             Empty list represents root namespace.
         data: The data to initialize the table, *optional*
@@ -1477,8 +1475,8 @@ class AsyncConnection(object):
         ...     await db.create_table("table4", make_batches(), schema=schema)
         >>> asyncio.run(iterable_example())
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         metadata = None
 
         if embedding_functions is not None:
@@ -1513,9 +1511,8 @@ class AsyncConnection(object):
                 name,
                 mode,
                 schema,
-                namespace=namespace,
+                namespace_path=namespace_path,
                 storage_options=storage_options,
-                storage_options_provider=storage_options_provider,
                 location=location,
             )
         else:
@@ -1524,9 +1521,8 @@ class AsyncConnection(object):
                 name,
                 mode,
                 data,
-                namespace=namespace,
+                namespace_path=namespace_path,
                 storage_options=storage_options,
-                storage_options_provider=storage_options_provider,
                 location=location,
             )
 
@@ -1536,9 +1532,8 @@ class AsyncConnection(object):
         self,
         name: str,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         index_cache_size: Optional[int] = None,
         location: Optional[str] = None,
         namespace_client: Optional[Any] = None,
@@ -1550,7 +1545,7 @@ class AsyncConnection(object):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to open the table from.
             None or empty list represents root namespace.
         storage_options: dict, optional
@@ -1583,13 +1578,12 @@ class AsyncConnection(object):
         -------
         A LanceTable object representing the table.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         table = await self._inner.open_table(
             name,
-            namespace=namespace,
+            namespace_path=namespace_path,
             storage_options=storage_options,
-            storage_options_provider=storage_options_provider,
             index_cache_size=index_cache_size,
             location=location,
             namespace_client=namespace_client,
@@ -1602,7 +1596,7 @@ class AsyncConnection(object):
         target_table_name: str,
         source_uri: str,
         *,
-        target_namespace: Optional[List[str]] = None,
+        target_namespace_path: Optional[List[str]] = None,
         source_version: Optional[int] = None,
         source_tag: Optional[str] = None,
         is_shallow: bool = True,
@@ -1620,7 +1614,7 @@ class AsyncConnection(object):
             The name of the target table to create.
         source_uri: str
             The URI of the source table to clone from.
-        target_namespace: List[str], optional
+        target_namespace_path: List[str], optional
             The namespace for the target table.
             None or empty list represents root namespace.
         source_version: int, optional
@@ -1635,12 +1629,12 @@ class AsyncConnection(object):
         -------
         An AsyncTable object representing the cloned table.
         """
-        if target_namespace is None:
-            target_namespace = []
+        if target_namespace_path is None:
+            target_namespace_path = []
         table = await self._inner.clone_table(
             target_table_name,
             source_uri,
-            target_namespace=target_namespace,
+            target_namespace_path=target_namespace_path,
             source_version=source_version,
             source_tag=source_tag,
             is_shallow=is_shallow,
@@ -1651,8 +1645,8 @@ class AsyncConnection(object):
         self,
         cur_name: str,
         new_name: str,
-        cur_namespace: Optional[List[str]] = None,
-        new_namespace: Optional[List[str]] = None,
+        cur_namespace_path: Optional[List[str]] = None,
+        new_namespace_path: Optional[List[str]] = None,
     ):
         """Rename a table in the database.
 
@@ -1662,26 +1656,29 @@ class AsyncConnection(object):
             The current name of the table.
         new_name: str
             The new name of the table.
-        cur_namespace: List[str], optional
+        cur_namespace_path: List[str], optional
             The namespace of the current table.
             None or empty list represents root namespace.
-        new_namespace: List[str], optional
+        new_namespace_path: List[str], optional
             The namespace to move the table to.
             If not specified, defaults to the same as cur_namespace.
         """
-        if cur_namespace is None:
-            cur_namespace = []
-        if new_namespace is None:
-            new_namespace = []
+        if cur_namespace_path is None:
+            cur_namespace_path = []
+        if new_namespace_path is None:
+            new_namespace_path = []
         await self._inner.rename_table(
-            cur_name, new_name, cur_namespace=cur_namespace, new_namespace=new_namespace
+            cur_name,
+            new_name,
+            cur_namespace_path=cur_namespace_path,
+            new_namespace_path=new_namespace_path,
         )
 
     async def drop_table(
         self,
         name: str,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         ignore_missing: bool = False,
     ):
         """Drop a table from the database.
@@ -1690,34 +1687,34 @@ class AsyncConnection(object):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The namespace to drop the table from.
             Empty list represents root namespace.
         ignore_missing: bool, default False
             If True, ignore if the table does not exist.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         try:
-            await self._inner.drop_table(name, namespace=namespace)
+            await self._inner.drop_table(name, namespace_path=namespace_path)
         except ValueError as e:
             if not ignore_missing:
                 raise e
             if f"Table '{name}' was not found" not in str(e):
                 raise e
 
-    async def drop_all_tables(self, namespace: Optional[List[str]] = None):
+    async def drop_all_tables(self, namespace_path: Optional[List[str]] = None):
         """Drop all tables from the database.
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to drop all tables from.
             None or empty list represents root namespace.
         """
-        if namespace is None:
-            namespace = []
-        await self._inner.drop_all_tables(namespace=namespace)
+        if namespace_path is None:
+            namespace_path = []
+        await self._inner.drop_all_tables(namespace_path=namespace_path)
 
     @deprecation.deprecated(
         deprecated_in="0.15.1",

python/python/lancedb/embeddings/utils.py

@@ -10,6 +10,7 @@ import sys
 import threading
 import time
 import urllib.error
+import urllib.request
 import weakref
 import logging
 from functools import wraps

python/python/lancedb/expr.py

@@ -0,0 +1,298 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright The LanceDB Authors
+
+"""Type-safe expression builder for filters and projections.
+
+Instead of writing raw SQL strings you can build expressions with Python
+operators::
+
+    from lancedb.expr import col, lit
+
+    # filter: age > 18 AND status = 'active'
+    filt = (col("age") > lit(18)) & (col("status") == lit("active"))
+
+    # projection: compute a derived column
+    proj = {"score": col("raw_score") * lit(1.5)}
+
+    table.search().where(filt).select(proj).to_list()
+"""
+
+from __future__ import annotations
+
+from typing import Union
+
+import pyarrow as pa
+
+from lancedb._lancedb import PyExpr, expr_col, expr_lit, expr_func
+
+__all__ = ["Expr", "col", "lit", "func"]
+
+_STR_TO_PA_TYPE: dict = {
+    "bool": pa.bool_(),
+    "boolean": pa.bool_(),
+    "int8": pa.int8(),
+    "int16": pa.int16(),
+    "int32": pa.int32(),
+    "int64": pa.int64(),
+    "uint8": pa.uint8(),
+    "uint16": pa.uint16(),
+    "uint32": pa.uint32(),
+    "uint64": pa.uint64(),
+    "float16": pa.float16(),
+    "float32": pa.float32(),
+    "float": pa.float32(),
+    "float64": pa.float64(),
+    "double": pa.float64(),
+    "string": pa.string(),
+    "utf8": pa.string(),
+    "str": pa.string(),
+    "large_string": pa.large_utf8(),
+    "large_utf8": pa.large_utf8(),
+    "date32": pa.date32(),
+    "date": pa.date32(),
+    "date64": pa.date64(),
+}
+
+
+def _coerce(value: "ExprLike") -> "Expr":
+    """Return *value* as an :class:`Expr`, wrapping plain Python values via
+    :func:`lit` if needed."""
+    if isinstance(value, Expr):
+        return value
+    return lit(value)
+
+
+# Type alias used in annotations.
+ExprLike = Union["Expr", bool, int, float, str]
+
+
+class Expr:
+    """A type-safe expression node.
+
+    Construct instances with :func:`col` and :func:`lit`, then combine them
+    using Python operators or the named methods below.
+
+    Examples
+    --------
+    >>> from lancedb.expr import col, lit
+    >>> filt = (col("age") > lit(18)) & (col("name").lower() == lit("alice"))
+    >>> proj = {"double": col("x") * lit(2)}
+    """
+
+    # Make Expr unhashable so that == returns an Expr rather than being used
+    # for dict keys / set membership.
+    __hash__ = None  # type: ignore[assignment]
+
+    def __init__(self, inner: PyExpr) -> None:
+        self._inner = inner
+
+    # ── comparisons ──────────────────────────────────────────────────────────
+
+    def __eq__(self, other: ExprLike) -> "Expr":  # type: ignore[override]
+        """Equal to (``col("x") == 1``)."""
+        return Expr(self._inner.eq(_coerce(other)._inner))
+
+    def __ne__(self, other: ExprLike) -> "Expr":  # type: ignore[override]
+        """Not equal to (``col("x") != 1``)."""
+        return Expr(self._inner.ne(_coerce(other)._inner))
+
+    def __lt__(self, other: ExprLike) -> "Expr":
+        """Less than (``col("x") < 1``)."""
+        return Expr(self._inner.lt(_coerce(other)._inner))
+
+    def __le__(self, other: ExprLike) -> "Expr":
+        """Less than or equal to (``col("x") <= 1``)."""
+        return Expr(self._inner.lte(_coerce(other)._inner))
+
+    def __gt__(self, other: ExprLike) -> "Expr":
+        """Greater than (``col("x") > 1``)."""
+        return Expr(self._inner.gt(_coerce(other)._inner))
+
+    def __ge__(self, other: ExprLike) -> "Expr":
+        """Greater than or equal to (``col("x") >= 1``)."""
+        return Expr(self._inner.gte(_coerce(other)._inner))
+
+    # ── logical ──────────────────────────────────────────────────────────────
+
+    def __and__(self, other: "Expr") -> "Expr":
+        """Logical AND (``expr_a & expr_b``)."""
+        return Expr(self._inner.and_(_coerce(other)._inner))
+
+    def __or__(self, other: "Expr") -> "Expr":
+        """Logical OR (``expr_a | expr_b``)."""
+        return Expr(self._inner.or_(_coerce(other)._inner))
+
+    def __invert__(self) -> "Expr":
+        """Logical NOT (``~expr``)."""
+        return Expr(self._inner.not_())
+
+    # ── arithmetic ───────────────────────────────────────────────────────────
+
+    def __add__(self, other: ExprLike) -> "Expr":
+        """Add (``col("x") + 1``)."""
+        return Expr(self._inner.add(_coerce(other)._inner))
+
+    def __radd__(self, other: ExprLike) -> "Expr":
+        """Right-hand add (``1 + col("x")``)."""
+        return Expr(_coerce(other)._inner.add(self._inner))
+
+    def __sub__(self, other: ExprLike) -> "Expr":
+        """Subtract (``col("x") - 1``)."""
+        return Expr(self._inner.sub(_coerce(other)._inner))
+
+    def __rsub__(self, other: ExprLike) -> "Expr":
+        """Right-hand subtract (``1 - col("x")``)."""
+        return Expr(_coerce(other)._inner.sub(self._inner))
+
+    def __mul__(self, other: ExprLike) -> "Expr":
+        """Multiply (``col("x") * 2``)."""
+        return Expr(self._inner.mul(_coerce(other)._inner))
+
+    def __rmul__(self, other: ExprLike) -> "Expr":
+        """Right-hand multiply (``2 * col("x")``)."""
+        return Expr(_coerce(other)._inner.mul(self._inner))
+
+    def __truediv__(self, other: ExprLike) -> "Expr":
+        """Divide (``col("x") / 2``)."""
+        return Expr(self._inner.div(_coerce(other)._inner))
+
+    def __rtruediv__(self, other: ExprLike) -> "Expr":
+        """Right-hand divide (``1 / col("x")``)."""
+        return Expr(_coerce(other)._inner.div(self._inner))
+
+    # ── string methods ───────────────────────────────────────────────────────
+
+    def lower(self) -> "Expr":
+        """Convert string column values to lowercase."""
+        return Expr(self._inner.lower())
+
+    def upper(self) -> "Expr":
+        """Convert string column values to uppercase."""
+        return Expr(self._inner.upper())
+
+    def contains(self, substr: "ExprLike") -> "Expr":
+        """Return True where the string contains *substr*."""
+        return Expr(self._inner.contains(_coerce(substr)._inner))
+
+    # ── type cast ────────────────────────────────────────────────────────────
+
+    def cast(self, data_type: Union[str, "pa.DataType"]) -> "Expr":
+        """Cast values to *data_type*.
+
+        Parameters
+        ----------
+        data_type:
+            A PyArrow ``DataType`` (e.g. ``pa.int32()``) or one of the type
+            name strings: ``"bool"``, ``"int8"``, ``"int16"``, ``"int32"``,
+            ``"int64"``, ``"uint8"``–``"uint64"``, ``"float32"``,
+            ``"float64"``, ``"string"``, ``"date32"``, ``"date64"``.
+        """
+        if isinstance(data_type, str):
+            try:
+                data_type = _STR_TO_PA_TYPE[data_type]
+            except KeyError:
+                raise ValueError(
+                    f"unsupported data type: '{data_type}'. Supported: "
+                    f"{', '.join(_STR_TO_PA_TYPE)}"
+                )
+        return Expr(self._inner.cast(data_type))
+
+    # ── named comparison helpers (alternative to operators) ──────────────────
+
+    def eq(self, other: ExprLike) -> "Expr":
+        """Equal to."""
+        return self.__eq__(other)
+
+    def ne(self, other: ExprLike) -> "Expr":
+        """Not equal to."""
+        return self.__ne__(other)
+
+    def lt(self, other: ExprLike) -> "Expr":
+        """Less than."""
+        return self.__lt__(other)
+
+    def lte(self, other: ExprLike) -> "Expr":
+        """Less than or equal to."""
+        return self.__le__(other)
+
+    def gt(self, other: ExprLike) -> "Expr":
+        """Greater than."""
+        return self.__gt__(other)
+
+    def gte(self, other: ExprLike) -> "Expr":
+        """Greater than or equal to."""
+        return self.__ge__(other)
+
+    def and_(self, other: "Expr") -> "Expr":
+        """Logical AND."""
+        return self.__and__(other)
+
+    def or_(self, other: "Expr") -> "Expr":
+        """Logical OR."""
+        return self.__or__(other)
+
+    # ── utilities ────────────────────────────────────────────────────────────
+
+    def to_sql(self) -> str:
+        """Render the expression as a SQL string (useful for debugging)."""
+        return self._inner.to_sql()
+
+    def __repr__(self) -> str:
+        return f"Expr({self._inner.to_sql()})"
+
+
+# ── free functions ────────────────────────────────────────────────────────────
+
+
+def col(name: str) -> Expr:
+    """Reference a table column by name.
+
+    Parameters
+    ----------
+    name:
+        The column name.
+
+    Examples
+    --------
+    >>> from lancedb.expr import col, lit
+    >>> col("age") > lit(18)
+    Expr((age > 18))
+    """
+    return Expr(expr_col(name))
+
+
+def lit(value: Union[bool, int, float, str]) -> Expr:
+    """Create a literal (constant) value expression.
+
+    Parameters
+    ----------
+    value:
+        A Python ``bool``, ``int``, ``float``, or ``str``.
+
+    Examples
+    --------
+    >>> from lancedb.expr import col, lit
+    >>> col("price") * lit(1.1)
+    Expr((price * 1.1))
+    """
+    return Expr(expr_lit(value))
+
+
+def func(name: str, *args: ExprLike) -> Expr:
+    """Call an arbitrary SQL function by name.
+
+    Parameters
+    ----------
+    name:
+        The SQL function name (e.g. ``"lower"``, ``"upper"``).
+    *args:
+        The function arguments as :class:`Expr` or plain Python literals.
+
+    Examples
+    --------
+    >>> from lancedb.expr import col, func
+    >>> func("lower", col("name"))
+    Expr(lower(name))
+    """
+    inner_args = [_coerce(a)._inner for a in args]
+    return Expr(expr_func(name, inner_args))

python/python/lancedb/io.py

@@ -2,70 +2,3 @@
 # SPDX-FileCopyrightText: Copyright The LanceDB Authors
 
 """I/O utilities and interfaces for LanceDB."""
-
-from abc import ABC, abstractmethod
-from typing import Dict
-
-
-class StorageOptionsProvider(ABC):
-    """Abstract base class for providing storage options to LanceDB tables.
-
-    Storage options providers enable automatic credential refresh for cloud
-    storage backends (e.g., AWS S3, Azure Blob Storage, GCS). When credentials
-    have an expiration time, the provider's fetch_storage_options() method will
-    be called periodically to get fresh credentials before they expire.
-
-    Example
-    -------
-    >>> class MyProvider(StorageOptionsProvider):
-    ...     def fetch_storage_options(self) -> Dict[str, str]:
-    ...         # Fetch fresh credentials from your credential manager
-    ...         return {
-    ...             "aws_access_key_id": "...",
-    ...             "aws_secret_access_key": "...",
-    ...             "expires_at_millis": "1234567890000"  # Optional
-    ...         }
-    """
-
-    @abstractmethod
-    def fetch_storage_options(self) -> Dict[str, str]:
-        """Fetch fresh storage credentials.
-
-        This method is called by LanceDB when credentials need to be refreshed.
-        If the returned dictionary contains an "expires_at_millis" key with a
-        Unix timestamp in milliseconds, LanceDB will automatically refresh the
-        credentials before that time. If the key is not present, credentials
-        are assumed to not expire.
-
-        Returns
-        -------
-        Dict[str, str]
-            Dictionary containing cloud storage credentials and optionally an
-            expiration time:
-            - "expires_at_millis" (optional): Unix timestamp in milliseconds when
-              credentials expire
-            - Provider-specific credential keys (e.g., aws_access_key_id,
-              aws_secret_access_key, etc.)
-
-        Raises
-        ------
-        RuntimeError
-            If credentials cannot be fetched or are invalid
-        """
-        pass
-
-    def provider_id(self) -> str:
-        """Return a human-readable unique identifier for this provider instance.
-
-        This identifier is used for caching and equality comparison. Two providers
-        with the same ID will share the same cached object store connection.
-
-        The default implementation uses the class name and string representation.
-        Override this method if you need custom identification logic.
-
-        Returns
-        -------
-        str
-            A unique identifier for this provider instance
-        """
-        return f"{self.__class__.__name__} {{ repr: {str(self)!r} }}"

python/python/lancedb/query.py

@@ -38,6 +38,7 @@ from .rerankers.base import Reranker
 from .rerankers.rrf import RRFReranker
 from .rerankers.util import check_reranker_result
 from .util import flatten_columns
+from .expr import Expr
 from lancedb._lancedb import fts_query_to_json
 from typing_extensions import Annotated
 
@@ -70,7 +71,7 @@ def ensure_vector_query(
 ) -> Union[List[float], List[List[float]], pa.Array, List[pa.Array]]:
     if isinstance(val, list):
         if len(val) == 0:
-            return ValueError("Vector query must be a non-empty list")
+            raise ValueError("Vector query must be a non-empty list")
         sample = val[0]
     else:
         if isinstance(val, float):
@@ -83,7 +84,7 @@ def ensure_vector_query(
         return val
     if isinstance(sample, list):
         if len(sample) == 0:
-            return ValueError("Vector query must be a non-empty list")
+            raise ValueError("Vector query must be a non-empty list")
         if isinstance(sample[0], float):
             # val is list of list of floats
             return val
@@ -449,8 +450,8 @@ class Query(pydantic.BaseModel):
         ensure_vector_query,
     ] = None
 
-    # sql filter to refine the query with
-    filter: Optional[str] = None
+    # sql filter or type-safe Expr to refine the query with
+    filter: Optional[Union[str, Expr]] = None
 
     # if True then apply the filter after vector search
     postfilter: Optional[bool] = None
@@ -464,8 +465,8 @@ class Query(pydantic.BaseModel):
     # distance type to use for vector search
     distance_type: Optional[str] = None
 
-    # which columns to return in the results
-    columns: Optional[Union[List[str], Dict[str, str]]] = None
+    # which columns to return in the results (dict values may be str or Expr)
+    columns: Optional[Union[List[str], Dict[str, Union[str, Expr]]]] = None
 
     # minimum number of IVF partitions to search
     #
@@ -856,14 +857,15 @@ class LanceQueryBuilder(ABC):
             self._offset = offset
         return self
 
-    def select(self, columns: Union[list[str], dict[str, str]]) -> Self:
+    def select(self, columns: Union[list[str], dict[str, Union[str, Expr]]]) -> Self:
         """Set the columns to return.
 
         Parameters
         ----------
-        columns: list of str, or dict of str to str default None
+        columns: list of str, or dict of str to str or Expr
             List of column names to be fetched.
-            Or a dictionary of column names to SQL expressions.
+            Or a dictionary of column names to SQL expressions or
+            :class:`~lancedb.expr.Expr` objects.
             All columns are fetched if None or unspecified.
 
         Returns
@@ -877,15 +879,15 @@ class LanceQueryBuilder(ABC):
             raise ValueError("columns must be a list or a dictionary")
         return self
 
-    def where(self, where: str, prefilter: bool = True) -> Self:
+    def where(self, where: Union[str, Expr], prefilter: bool = True) -> Self:
         """Set the where clause.
 
         Parameters
         ----------
-        where: str
-            The where clause which is a valid SQL where clause. See
-            `Lance filter pushdown <https://lance.org/guide/read_and_write#filter-push-down>`_
-            for valid SQL expressions.
+        where: str or :class:`~lancedb.expr.Expr`
+            The filter condition.  Can be a SQL string or a type-safe
+            :class:`~lancedb.expr.Expr` built with :func:`~lancedb.expr.col`
+            and :func:`~lancedb.expr.lit`.
         prefilter: bool, default True
             If True, apply the filter before vector search, otherwise the
             filter is applied on the result of vector search.
@@ -1355,15 +1357,17 @@ class LanceVectorQueryBuilder(LanceQueryBuilder):
 
         return result_set
 
-    def where(self, where: str, prefilter: bool = None) -> LanceVectorQueryBuilder:
+    def where(
+        self, where: Union[str, Expr], prefilter: bool = None
+    ) -> LanceVectorQueryBuilder:
         """Set the where clause.
 
         Parameters
         ----------
-        where: str
-            The where clause which is a valid SQL where clause. See
-            `Lance filter pushdown <https://lance.org/guide/read_and_write#filter-push-down>`_
-            for valid SQL expressions.
+        where: str or :class:`~lancedb.expr.Expr`
+            The filter condition.  Can be a SQL string or a type-safe
+            :class:`~lancedb.expr.Expr` built with :func:`~lancedb.expr.col`
+            and :func:`~lancedb.expr.lit`.
         prefilter: bool, default True
             If True, apply the filter before vector search, otherwise the
             filter is applied on the result of vector search.
@@ -2286,10 +2290,20 @@ class AsyncQueryBase(object):
         """
         if isinstance(columns, list) and all(isinstance(c, str) for c in columns):
             self._inner.select_columns(columns)
-        elif isinstance(columns, dict) and all(
-            isinstance(k, str) and isinstance(v, str) for k, v in columns.items()
-        ):
-            self._inner.select(list(columns.items()))
+        elif isinstance(columns, dict) and all(isinstance(k, str) for k in columns):
+            if any(isinstance(v, Expr) for v in columns.values()):
+                # At least one value is an Expr — use the type-safe path.
+                from .expr import _coerce
+
+                pairs = [(k, _coerce(v)._inner) for k, v in columns.items()]
+                self._inner.select_expr(pairs)
+            elif all(isinstance(v, str) for v in columns.values()):
+                self._inner.select(list(columns.items()))
+            else:
+                raise TypeError(
+                    "dict values must be str or Expr, got "
+                    + str({k: type(v) for k, v in columns.items()})
+                )
         else:
             raise TypeError("columns must be a list of column names or a dict")
         return self
@@ -2529,11 +2543,13 @@ class AsyncStandardQuery(AsyncQueryBase):
         """
         super().__init__(inner)
 
-    def where(self, predicate: str) -> Self:
+    def where(self, predicate: Union[str, Expr]) -> Self:
         """
         Only return rows matching the given predicate
 
-        The predicate should be supplied as an SQL query string.
+        The predicate can be a SQL string or a type-safe
+        :class:`~lancedb.expr.Expr` built with :func:`~lancedb.expr.col`
+        and :func:`~lancedb.expr.lit`.
 
         Examples
         --------
@@ -2545,7 +2561,10 @@ class AsyncStandardQuery(AsyncQueryBase):
         Filtering performance can often be improved by creating a scalar index
         on the filter column(s).
         """
-        self._inner.where(predicate)
+        if isinstance(predicate, Expr):
+            self._inner.where_expr(predicate._inner)
+        else:
+            self._inner.where(predicate)
         return self
 
     def limit(self, limit: int) -> Self:

python/python/lancedb/remote/db.py

@@ -111,7 +111,7 @@ class RemoteDBConnection(DBConnection):
     @override
     def list_namespaces(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListNamespacesResponse:
@@ -119,7 +119,7 @@ class RemoteDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The parent namespace to list namespaces in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -133,18 +133,18 @@ class RemoteDBConnection(DBConnection):
         ListNamespacesResponse
             Response containing namespace names and optional page_token for pagination.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return LOOP.run(
             self._conn.list_namespaces(
-                namespace=namespace, page_token=page_token, limit=limit
+                namespace_path=namespace_path, page_token=page_token, limit=limit
             )
         )
 
     @override
     def create_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         properties: Optional[Dict[str, str]] = None,
     ) -> CreateNamespaceResponse:
@@ -152,7 +152,7 @@ class RemoteDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to create.
         mode: str, optional
             Creation mode - "create" (fail if exists), "exist_ok" (skip if exists),
@@ -167,14 +167,14 @@ class RemoteDBConnection(DBConnection):
         """
         return LOOP.run(
             self._conn.create_namespace(
-                namespace=namespace, mode=mode, properties=properties
+                namespace_path=namespace_path, mode=mode, properties=properties
             )
         )
 
     @override
     def drop_namespace(
         self,
-        namespace: List[str],
+        namespace_path: List[str],
         mode: Optional[str] = None,
         behavior: Optional[str] = None,
     ) -> DropNamespaceResponse:
@@ -182,7 +182,7 @@ class RemoteDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to drop.
         mode: str, optional
             Whether to skip if not exists ("SKIP") or fail ("FAIL"). Case insensitive.
@@ -196,16 +196,20 @@ class RemoteDBConnection(DBConnection):
             Response containing properties and transaction_id if applicable.
         """
         return LOOP.run(
-            self._conn.drop_namespace(namespace=namespace, mode=mode, behavior=behavior)
+            self._conn.drop_namespace(
+                namespace_path=namespace_path, mode=mode, behavior=behavior
+            )
         )
 
     @override
-    def describe_namespace(self, namespace: List[str]) -> DescribeNamespaceResponse:
+    def describe_namespace(
+        self, namespace_path: List[str]
+    ) -> DescribeNamespaceResponse:
         """Describe a namespace.
 
         Parameters
         ----------
-        namespace: List[str]
+        namespace_path: List[str]
             The namespace identifier to describe.
 
         Returns
@@ -213,12 +217,12 @@ class RemoteDBConnection(DBConnection):
         DescribeNamespaceResponse
             Response containing the namespace properties.
         """
-        return LOOP.run(self._conn.describe_namespace(namespace=namespace))
+        return LOOP.run(self._conn.describe_namespace(namespace_path=namespace_path))
 
     @override
     def list_tables(
         self,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         page_token: Optional[str] = None,
         limit: Optional[int] = None,
     ) -> ListTablesResponse:
@@ -226,7 +230,7 @@ class RemoteDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to list tables in.
             None or empty list represents root namespace.
         page_token: str, optional
@@ -240,11 +244,11 @@ class RemoteDBConnection(DBConnection):
         ListTablesResponse
             Response containing table names and optional page_token for pagination.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return LOOP.run(
             self._conn.list_tables(
-                namespace=namespace, page_token=page_token, limit=limit
+                namespace_path=namespace_path, page_token=page_token, limit=limit
             )
         )
 
@@ -254,7 +258,7 @@ class RemoteDBConnection(DBConnection):
         page_token: Optional[str] = None,
         limit: int = 10,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
     ) -> Iterable[str]:
         """List the names of all tables in the database.
 
@@ -263,7 +267,7 @@ class RemoteDBConnection(DBConnection):
 
         Parameters
         ----------
-        namespace: List[str], default []
+        namespace_path: List[str], default []
             The namespace to list tables in.
             Empty list represents root namespace.
         page_token: str
@@ -282,11 +286,11 @@ class RemoteDBConnection(DBConnection):
             DeprecationWarning,
             stacklevel=2,
         )
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         return LOOP.run(
             self._conn.table_names(
-                namespace=namespace, start_after=page_token, limit=limit
+                namespace_path=namespace_path, start_after=page_token, limit=limit
             )
         )
 
@@ -295,7 +299,7 @@ class RemoteDBConnection(DBConnection):
         self,
         name: str,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
         index_cache_size: Optional[int] = None,
     ) -> Table:
@@ -305,7 +309,7 @@ class RemoteDBConnection(DBConnection):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to open the table from.
             None or empty list represents root namespace.
 
@@ -315,15 +319,15 @@ class RemoteDBConnection(DBConnection):
         """
         from .table import RemoteTable
 
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         if index_cache_size is not None:
             logging.info(
                 "index_cache_size is ignored in LanceDb Cloud"
                 " (there is no local cache to configure)"
             )
 
-        table = LOOP.run(self._conn.open_table(name, namespace=namespace))
+        table = LOOP.run(self._conn.open_table(name, namespace_path=namespace_path))
         return RemoteTable(table, self.db_name)
 
     def clone_table(
@@ -331,7 +335,7 @@ class RemoteDBConnection(DBConnection):
         target_table_name: str,
         source_uri: str,
         *,
-        target_namespace: Optional[List[str]] = None,
+        target_namespace_path: Optional[List[str]] = None,
         source_version: Optional[int] = None,
         source_tag: Optional[str] = None,
         is_shallow: bool = True,
@@ -344,7 +348,7 @@ class RemoteDBConnection(DBConnection):
             The name of the target table to create.
         source_uri: str
             The URI of the source table to clone from.
-        target_namespace: List[str], optional
+        target_namespace_path: List[str], optional
             The namespace for the target table.
             None or empty list represents root namespace.
         source_version: int, optional
@@ -361,13 +365,13 @@ class RemoteDBConnection(DBConnection):
         """
         from .table import RemoteTable
 
-        if target_namespace is None:
-            target_namespace = []
+        if target_namespace_path is None:
+            target_namespace_path = []
         table = LOOP.run(
             self._conn.clone_table(
                 target_table_name,
                 source_uri,
-                target_namespace=target_namespace,
+                target_namespace_path=target_namespace_path,
                 source_version=source_version,
                 source_tag=source_tag,
                 is_shallow=is_shallow,
@@ -387,7 +391,7 @@ class RemoteDBConnection(DBConnection):
         exist_ok: bool = False,
         embedding_functions: Optional[List[EmbeddingFunctionConfig]] = None,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
     ) -> Table:
         """Create a [Table][lancedb.table.Table] in the database.
 
@@ -395,7 +399,7 @@ class RemoteDBConnection(DBConnection):
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to create the table in.
             None or empty list represents root namespace.
         data: The data to initialize the table, *optional*
@@ -495,8 +499,8 @@ class RemoteDBConnection(DBConnection):
                 mode = "exist_ok"
             elif not mode:
                 mode = "exist_ok"
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         validate_table_name(name)
         if embedding_functions is not None:
             logging.warning(
@@ -511,7 +515,7 @@ class RemoteDBConnection(DBConnection):
             self._conn.create_table(
                 name,
                 data,
-                namespace=namespace,
+                namespace_path=namespace_path,
                 mode=mode,
                 schema=schema,
                 on_bad_vectors=on_bad_vectors,
@@ -521,28 +525,28 @@ class RemoteDBConnection(DBConnection):
         return RemoteTable(table, self.db_name)
 
     @override
-    def drop_table(self, name: str, namespace: Optional[List[str]] = None):
+    def drop_table(self, name: str, namespace_path: Optional[List[str]] = None):
         """Drop a table from the database.
 
         Parameters
         ----------
         name: str
             The name of the table.
-        namespace: List[str], optional
+        namespace_path: List[str], optional
             The namespace to drop the table from.
             None or empty list represents root namespace.
         """
-        if namespace is None:
-            namespace = []
-        LOOP.run(self._conn.drop_table(name, namespace=namespace))
+        if namespace_path is None:
+            namespace_path = []
+        LOOP.run(self._conn.drop_table(name, namespace_path=namespace_path))
 
     @override
     def rename_table(
         self,
         cur_name: str,
         new_name: str,
-        cur_namespace: Optional[List[str]] = None,
-        new_namespace: Optional[List[str]] = None,
+        cur_namespace_path: Optional[List[str]] = None,
+        new_namespace_path: Optional[List[str]] = None,
     ):
         """Rename a table in the database.
 
@@ -553,19 +557,19 @@ class RemoteDBConnection(DBConnection):
         new_name: str
             The new name of the table.
         """
-        if cur_namespace is None:
-            cur_namespace = []
-        if new_namespace is None:
-            new_namespace = []
+        if cur_namespace_path is None:
+            cur_namespace_path = []
+        if new_namespace_path is None:
+            new_namespace_path = []
         LOOP.run(
             self._conn.rename_table(
                 cur_name,
                 new_name,
-                cur_namespace=cur_namespace,
-                new_namespace=new_namespace,
+                cur_namespace_path=cur_namespace_path,
+                new_namespace_path=new_namespace_path,
             )
         )
 
     async def close(self):
         """Close the connection to the database."""
-        self._client.close()
+        self._conn.close()

python/python/lancedb/table.py

@@ -89,7 +89,6 @@ from .index import lang_mapping
 
 if TYPE_CHECKING:
     from .db import LanceDBConnection
-    from .io import StorageOptionsProvider
     from ._lancedb import (
         Table as LanceDBTable,
         OptimizeStats,
@@ -278,7 +277,7 @@ def _sanitize_data(
 
     if metadata:
         new_metadata = target_schema.metadata or {}
-        new_metadata = new_metadata.update(metadata)
+        new_metadata.update(metadata)
         target_schema = target_schema.with_metadata(new_metadata)
 
     _validate_schema(target_schema)
@@ -1776,30 +1775,30 @@ class LanceTable(Table):
         connection: "LanceDBConnection",
         name: str,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         index_cache_size: Optional[int] = None,
         location: Optional[str] = None,
         namespace_client: Optional[Any] = None,
         managed_versioning: Optional[bool] = None,
+        pushdown_operations: Optional[set] = None,
         _async: AsyncTable = None,
     ):
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         self._conn = connection
-        self._namespace = namespace
+        self._namespace_path = namespace_path
         self._location = location  # Store location for use in _dataset_path
         self._namespace_client = namespace_client
+        self._pushdown_operations = pushdown_operations or set()
         if _async is not None:
             self._table = _async
         else:
             self._table = LOOP.run(
                 connection._conn.open_table(
                     name,
-                    namespace=namespace,
+                    namespace_path=namespace_path,
                     storage_options=storage_options,
-                    storage_options_provider=storage_options_provider,
                     index_cache_size=index_cache_size,
                     location=location,
                     namespace_client=namespace_client,
@@ -1814,13 +1813,13 @@ class LanceTable(Table):
     @property
     def namespace(self) -> List[str]:
         """Return the namespace path of the table."""
-        return self._namespace
+        return self._namespace_path
 
     @property
     def id(self) -> str:
         """Return the full identifier of the table (namespace$name)."""
-        if self._namespace:
-            return "$".join(self._namespace + [self.name])
+        if self._namespace_path:
+            return "$".join(self._namespace_path + [self.name])
         return self.name
 
     @classmethod
@@ -1841,26 +1840,26 @@ class LanceTable(Table):
         db,
         name,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         index_cache_size: Optional[int] = None,
         location: Optional[str] = None,
         namespace_client: Optional[Any] = None,
         managed_versioning: Optional[bool] = None,
+        pushdown_operations: Optional[set] = None,
     ):
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         tbl = cls(
             db,
             name,
-            namespace=namespace,
+            namespace_path=namespace_path,
             storage_options=storage_options,
-            storage_options_provider=storage_options_provider,
             index_cache_size=index_cache_size,
             location=location,
             namespace_client=namespace_client,
             managed_versioning=managed_versioning,
+            pushdown_operations=pushdown_operations,
         )
 
         # check the dataset exists
@@ -1893,11 +1892,11 @@ class LanceTable(Table):
             )
 
         if self._namespace_client is not None:
-            table_id = self._namespace + [self.name]
+            table_id = self._namespace_path + [self.name]
             return lance.dataset(
                 version=self.version,
                 storage_options=self._conn.storage_options,
-                namespace=self._namespace_client,
+                namespace_client=self._namespace_client,
                 table_id=table_id,
                 **kwargs,
             )
@@ -2803,13 +2802,13 @@ class LanceTable(Table):
         fill_value: float = 0.0,
         embedding_functions: Optional[List[EmbeddingFunctionConfig]] = None,
         *,
-        namespace: Optional[List[str]] = None,
+        namespace_path: Optional[List[str]] = None,
         storage_options: Optional[Dict[str, str | bool]] = None,
-        storage_options_provider: Optional["StorageOptionsProvider"] = None,
         data_storage_version: Optional[str] = None,
         enable_v2_manifest_paths: Optional[bool] = None,
         location: Optional[str] = None,
         namespace_client: Optional[Any] = None,
+        pushdown_operations: Optional[set] = None,
     ):
         """
         Create a new table.
@@ -2864,13 +2863,14 @@ class LanceTable(Table):
             Deprecated.  Set `storage_options` when connecting to the database and set
             `new_table_enable_v2_manifest_paths` in the options.
         """
-        if namespace is None:
-            namespace = []
+        if namespace_path is None:
+            namespace_path = []
         self = cls.__new__(cls)
         self._conn = db
-        self._namespace = namespace
+        self._namespace_path = namespace_path
         self._location = location
         self._namespace_client = namespace_client
+        self._pushdown_operations = pushdown_operations or set()
 
         if data_storage_version is not None:
             warnings.warn(
@@ -2903,9 +2903,8 @@ class LanceTable(Table):
                 on_bad_vectors=on_bad_vectors,
                 fill_value=fill_value,
                 embedding_functions=embedding_functions,
-                namespace=namespace,
+                namespace_path=namespace_path,
                 storage_options=storage_options,
-                storage_options_provider=storage_options_provider,
                 location=location,
             )
         )
@@ -2974,6 +2973,15 @@ class LanceTable(Table):
         batch_size: Optional[int] = None,
         timeout: Optional[timedelta] = None,
     ) -> pa.RecordBatchReader:
+        if (
+            "QueryTable" in self._pushdown_operations
+            and self._namespace_client is not None
+        ):
+            from lancedb.namespace import _execute_server_side_query
+
+            table_id = self._namespace_path + [self.name]
+            return _execute_server_side_query(self._namespace_client, table_id, query)
+
         async_iter = LOOP.run(
             self._table._execute_query(query, batch_size=batch_size, timeout=timeout)
         )
@@ -3857,7 +3865,13 @@ class AsyncTable:
 
         # _santitize_data is an old code path, but we will use it until the
         # new code path is ready.
-        if on_bad_vectors != "error" or (
+        if mode == "overwrite":
+            # For overwrite, apply the same preprocessing as create_table
+            # so vector columns are inferred as FixedSizeList.
+            data, _ = sanitize_create_table(
+                data, None, on_bad_vectors=on_bad_vectors, fill_value=fill_value
+            )
+        elif on_bad_vectors != "error" or (
             schema.metadata is not None and b"embedding_functions" in schema.metadata
         ):
             data = _sanitize_data(
@@ -4205,7 +4219,7 @@ class AsyncTable:
             async_query = async_query.offset(query.offset)
         if query.columns:
             async_query = async_query.select(query.columns)
-        if query.filter:
+        if query.filter is not None:
             async_query = async_query.where(query.filter)
         if query.fast_search:
             async_query = async_query.fast_search()

python/python/tests/test_db.py

@@ -183,8 +183,8 @@ def test_table_names(tmp_db: lancedb.DBConnection):
     result = list(tmp_db.table_names("test2", limit=2))
     assert result == ["test3"], f"Expected ['test3'], got {result}"
 
-    # Test that namespace parameter can be passed as keyword
-    result = list(tmp_db.table_names(namespace=[]))
+    # Test that namespace_path parameter can be passed as keyword
+    result = list(tmp_db.table_names(namespace_path=[]))
     assert len(result) == 3
 
 
@@ -909,7 +909,7 @@ def test_local_namespace_operations(tmp_path):
         NotImplementedError,
         match="Namespace operations are not supported for listing database",
     ):
-        db.list_namespaces(namespace=["test"])
+        db.list_namespaces(namespace_path=["test"])
 
 
 def test_local_create_namespace_not_supported(tmp_path):

python/python/tests/test_embeddings.py

@@ -546,3 +546,24 @@ def test_openai_no_retry_on_401(mock_sleep):
     assert mock_func.call_count == 1
     # Verify that sleep was never called (no retries)
     assert mock_sleep.call_count == 0
+
+
+def test_url_retrieve_downloads_image():
+    """
+    Embedding functions like open-clip, siglip, and jinaai use url_retrieve()
+    to download images from HTTP URLs. For example, open_clip._to_pil() calls:
+
+        PIL_Image.open(io.BytesIO(url_retrieve(image)))
+
+    Verify that url_retrieve() can download an image and open it as PIL Image,
+    matching the real usage pattern in embedding functions.
+    """
+    import io
+
+    Image = pytest.importorskip("PIL.Image")
+    from lancedb.embeddings.utils import url_retrieve
+
+    image_url = "http://farm1.staticflickr.com/53/167798175_7c7845bbbd_z.jpg"
+    image_bytes = url_retrieve(image_url)
+    img = Image.open(io.BytesIO(image_bytes))
+    assert img.size[0] > 0 and img.size[1] > 0

python/python/tests/test_namespace.py

@@ -8,6 +8,7 @@ import shutil
 import pytest
 import pyarrow as pa
 import lancedb
+from lance_namespace.errors import NamespaceNotEmptyError, TableNotFoundError
 
 
 class TestNamespaceConnection:
@@ -32,6 +33,16 @@ class TestNamespaceConnection:
         # Initially no tables in root
         assert len(list(db.table_names())) == 0
 
+    def test_connect_via_connect_helper(self):
+        """Connecting via lancedb.connect should delegate to namespace connection."""
+        db = lancedb.connect(
+            namespace_client_impl="dir",
+            namespace_client_properties={"root": self.temp_dir},
+        )
+
+        assert isinstance(db, lancedb.LanceNamespaceDBConnection)
+        assert len(list(db.table_names())) == 0
+
     def test_create_table_through_namespace(self):
         """Test creating a table through namespace."""
         db = lancedb.connect_namespace("dir", {"root": self.temp_dir})
@@ -49,14 +60,14 @@ class TestNamespaceConnection:
         )
 
         # Create empty table in child namespace
-        table = db.create_table("test_table", schema=schema, namespace=["test_ns"])
+        table = db.create_table("test_table", schema=schema, namespace_path=["test_ns"])
         assert table is not None
         assert table.name == "test_table"
         assert table.namespace == ["test_ns"]
         assert table.id == "test_ns$test_table"
 
         # Table should appear in child namespace
-        table_names = list(db.table_names(namespace=["test_ns"]))
+        table_names = list(db.table_names(namespace_path=["test_ns"]))
         assert "test_table" in table_names
         assert len(table_names) == 1
 
@@ -79,10 +90,10 @@ class TestNamespaceConnection:
                 pa.field("vector", pa.list_(pa.float32(), 2)),
             ]
         )
-        db.create_table("test_table", schema=schema, namespace=["test_ns"])
+        db.create_table("test_table", schema=schema, namespace_path=["test_ns"])
 
         # Open the table
-        table = db.open_table("test_table", namespace=["test_ns"])
+        table = db.open_table("test_table", namespace_path=["test_ns"])
         assert table is not None
         assert table.name == "test_table"
         assert table.namespace == ["test_ns"]
@@ -107,31 +118,31 @@ class TestNamespaceConnection:
                 pa.field("vector", pa.list_(pa.float32(), 2)),
             ]
         )
-        db.create_table("table1", schema=schema, namespace=["test_ns"])
-        db.create_table("table2", schema=schema, namespace=["test_ns"])
+        db.create_table("table1", schema=schema, namespace_path=["test_ns"])
+        db.create_table("table2", schema=schema, namespace_path=["test_ns"])
 
         # Verify both tables exist in child namespace
-        table_names = list(db.table_names(namespace=["test_ns"]))
+        table_names = list(db.table_names(namespace_path=["test_ns"]))
         assert "table1" in table_names
         assert "table2" in table_names
         assert len(table_names) == 2
 
         # Drop one table
-        db.drop_table("table1", namespace=["test_ns"])
+        db.drop_table("table1", namespace_path=["test_ns"])
 
         # Verify only table2 remains
-        table_names = list(db.table_names(namespace=["test_ns"]))
+        table_names = list(db.table_names(namespace_path=["test_ns"]))
         assert "table1" not in table_names
         assert "table2" in table_names
         assert len(table_names) == 1
 
         # Drop the second table
-        db.drop_table("table2", namespace=["test_ns"])
-        assert len(list(db.table_names(namespace=["test_ns"]))) == 0
+        db.drop_table("table2", namespace_path=["test_ns"])
+        assert len(list(db.table_names(namespace_path=["test_ns"]))) == 0
 
         # Should not be able to open dropped table
-        with pytest.raises(RuntimeError):
-            db.open_table("table1", namespace=["test_ns"])
+        with pytest.raises(TableNotFoundError):
+            db.open_table("table1", namespace_path=["test_ns"])
 
     def test_create_table_with_schema(self):
         """Test creating a table with explicit schema through namespace."""
@@ -150,7 +161,7 @@ class TestNamespaceConnection:
         )
 
         # Create table with schema in child namespace
-        table = db.create_table("test_table", schema=schema, namespace=["test_ns"])
+        table = db.create_table("test_table", schema=schema, namespace_path=["test_ns"])
         assert table is not None
         assert table.namespace == ["test_ns"]
 
@@ -174,7 +185,7 @@ class TestNamespaceConnection:
                 pa.field("vector", pa.list_(pa.float32(), 2)),
             ]
         )
-        db.create_table("old_name", schema=schema, namespace=["test_ns"])
+        db.create_table("old_name", schema=schema, namespace_path=["test_ns"])
 
         # Rename should raise NotImplementedError
         with pytest.raises(NotImplementedError, match="rename_table is not supported"):
@@ -195,20 +206,20 @@ class TestNamespaceConnection:
             ]
         )
         for i in range(3):
-            db.create_table(f"table{i}", schema=schema, namespace=["test_ns"])
+            db.create_table(f"table{i}", schema=schema, namespace_path=["test_ns"])
 
         # Verify tables exist in child namespace
-        assert len(list(db.table_names(namespace=["test_ns"]))) == 3
+        assert len(list(db.table_names(namespace_path=["test_ns"]))) == 3
 
         # Drop all tables in child namespace
-        db.drop_all_tables(namespace=["test_ns"])
+        db.drop_all_tables(namespace_path=["test_ns"])
 
         # Verify all tables are gone from child namespace
-        assert len(list(db.table_names(namespace=["test_ns"]))) == 0
+        assert len(list(db.table_names(namespace_path=["test_ns"]))) == 0
 
         # Test that table_names works with keyword-only namespace parameter
-        db.create_table("test_table", schema=schema, namespace=["test_ns"])
-        result = list(db.table_names(namespace=["test_ns"]))
+        db.create_table("test_table", schema=schema, namespace_path=["test_ns"])
+        result = list(db.table_names(namespace_path=["test_ns"]))
         assert "test_table" in result
 
     def test_table_operations(self):
@@ -226,7 +237,7 @@ class TestNamespaceConnection:
                 pa.field("text", pa.string()),
             ]
         )
-        table = db.create_table("test_table", schema=schema, namespace=["test_ns"])
+        table = db.create_table("test_table", schema=schema, namespace_path=["test_ns"])
 
         # Verify empty table was created
         result = table.to_pandas()
@@ -297,25 +308,25 @@ class TestNamespaceConnection:
             ]
         )
         table = db.create_table(
-            "test_table", schema=schema, namespace=["test_namespace"]
+            "test_table", schema=schema, namespace_path=["test_namespace"]
         )
         assert table is not None
 
         # Verify table exists in namespace
-        tables_in_namespace = list(db.table_names(namespace=["test_namespace"]))
+        tables_in_namespace = list(db.table_names(namespace_path=["test_namespace"]))
         assert "test_table" in tables_in_namespace
         assert len(tables_in_namespace) == 1
 
         # Open table from namespace
-        table = db.open_table("test_table", namespace=["test_namespace"])
+        table = db.open_table("test_table", namespace_path=["test_namespace"])
         assert table is not None
         assert table.name == "test_table"
 
         # Drop table from namespace
-        db.drop_table("test_table", namespace=["test_namespace"])
+        db.drop_table("test_table", namespace_path=["test_namespace"])
 
         # Verify table no longer exists in namespace
-        tables_in_namespace = list(db.table_names(namespace=["test_namespace"]))
+        tables_in_namespace = list(db.table_names(namespace_path=["test_namespace"]))
         assert len(tables_in_namespace) == 0
 
         # Drop namespace
@@ -337,14 +348,14 @@ class TestNamespaceConnection:
                 pa.field("vector", pa.list_(pa.float32(), 2)),
             ]
         )
-        db.create_table("test_table", schema=schema, namespace=["test_namespace"])
+        db.create_table("test_table", schema=schema, namespace_path=["test_namespace"])
 
         # Try to drop namespace with tables - should fail
-        with pytest.raises(RuntimeError, match="is not empty"):
+        with pytest.raises(NamespaceNotEmptyError):
             db.drop_namespace(["test_namespace"])
 
         # Drop table first
-        db.drop_table("test_table", namespace=["test_namespace"])
+        db.drop_table("test_table", namespace_path=["test_namespace"])
 
         # Now dropping namespace should work
         db.drop_namespace(["test_namespace"])
@@ -367,10 +378,10 @@ class TestNamespaceConnection:
 
         # Create table with same name in both namespaces
         table_a = db.create_table(
-            "same_name_table", schema=schema, namespace=["namespace_a"]
+            "same_name_table", schema=schema, namespace_path=["namespace_a"]
         )
         table_b = db.create_table(
-            "same_name_table", schema=schema, namespace=["namespace_b"]
+            "same_name_table", schema=schema, namespace_path=["namespace_b"]
         )
 
         # Add different data to each table
@@ -388,7 +399,9 @@ class TestNamespaceConnection:
         table_b.add(data_b)
 
         # Verify data in namespace_a table
-        opened_table_a = db.open_table("same_name_table", namespace=["namespace_a"])
+        opened_table_a = db.open_table(
+            "same_name_table", namespace_path=["namespace_a"]
+        )
         result_a = opened_table_a.to_pandas().sort_values("id").reset_index(drop=True)
         assert len(result_a) == 2
         assert result_a["id"].tolist() == [1, 2]
@@ -399,7 +412,9 @@ class TestNamespaceConnection:
         assert [v.tolist() for v in result_a["vector"]] == [[1.0, 2.0], [3.0, 4.0]]
 
         # Verify data in namespace_b table
-        opened_table_b = db.open_table("same_name_table", namespace=["namespace_b"])
+        opened_table_b = db.open_table(
+            "same_name_table", namespace_path=["namespace_b"]
+        )
         result_b = opened_table_b.to_pandas().sort_values("id").reset_index(drop=True)
         assert len(result_b) == 3
         assert result_b["id"].tolist() == [10, 20, 30]
@@ -419,8 +434,8 @@ class TestNamespaceConnection:
         assert "same_name_table" not in root_tables
 
         # Clean up
-        db.drop_table("same_name_table", namespace=["namespace_a"])
-        db.drop_table("same_name_table", namespace=["namespace_b"])
+        db.drop_table("same_name_table", namespace_path=["namespace_a"])
+        db.drop_table("same_name_table", namespace_path=["namespace_b"])
         db.drop_namespace(["namespace_a"])
         db.drop_namespace(["namespace_b"])
 
@@ -448,6 +463,8 @@ class TestAsyncNamespaceConnection:
         table_names = await db.table_names()
         assert len(list(table_names)) == 0
 
+    # Async connect via namespace helper is not enabled yet.
+
     async def test_create_table_async(self):
         """Test creating a table asynchronously through namespace."""
         db = lancedb.connect_namespace_async("dir", {"root": self.temp_dir})
@@ -466,13 +483,13 @@ class TestAsyncNamespaceConnection:
 
         # Create empty table in child namespace
         table = await db.create_table(
-            "test_table", schema=schema, namespace=["test_ns"]
+            "test_table", schema=schema, namespace_path=["test_ns"]
         )
         assert table is not None
         assert isinstance(table, lancedb.AsyncTable)
 
         # Table should appear in child namespace
-        table_names = await db.table_names(namespace=["test_ns"])
+        table_names = await db.table_names(namespace_path=["test_ns"])
         assert "test_table" in list(table_names)
 
     async def test_open_table_async(self):
@@ -489,10 +506,10 @@ class TestAsyncNamespaceConnection:
                 pa.field("vector", pa.list_(pa.float32(), 2)),
             ]
         )
-        await db.create_table("test_table", schema=schema, namespace=["test_ns"])
+        await db.create_table("test_table", schema=schema, namespace_path=["test_ns"])
 
         # Open the table
-        table = await db.open_table("test_table", namespace=["test_ns"])
+        table = await db.open_table("test_table", namespace_path=["test_ns"])
         assert table is not None
         assert isinstance(table, lancedb.AsyncTable)
 
@@ -546,20 +563,20 @@ class TestAsyncNamespaceConnection:
                 pa.field("vector", pa.list_(pa.float32(), 2)),
             ]
         )
-        await db.create_table("table1", schema=schema, namespace=["test_ns"])
-        await db.create_table("table2", schema=schema, namespace=["test_ns"])
+        await db.create_table("table1", schema=schema, namespace_path=["test_ns"])
+        await db.create_table("table2", schema=schema, namespace_path=["test_ns"])
 
         # Verify both tables exist in child namespace
-        table_names = list(await db.table_names(namespace=["test_ns"]))
+        table_names = list(await db.table_names(namespace_path=["test_ns"]))
         assert "table1" in table_names
         assert "table2" in table_names
         assert len(table_names) == 2
 
         # Drop one table
-        await db.drop_table("table1", namespace=["test_ns"])
+        await db.drop_table("table1", namespace_path=["test_ns"])
 
         # Verify only table2 remains
-        table_names = list(await db.table_names(namespace=["test_ns"]))
+        table_names = list(await db.table_names(namespace_path=["test_ns"]))
         assert "table1" not in table_names
         assert "table2" in table_names
         assert len(table_names) == 1
@@ -588,20 +605,24 @@ class TestAsyncNamespaceConnection:
             ]
         )
         table = await db.create_table(
-            "test_table", schema=schema, namespace=["test_namespace"]
+            "test_table", schema=schema, namespace_path=["test_namespace"]
         )
         assert table is not None
 
         # Verify table exists in namespace
-        tables_in_namespace = list(await db.table_names(namespace=["test_namespace"]))
+        tables_in_namespace = list(
+            await db.table_names(namespace_path=["test_namespace"])
+        )
         assert "test_table" in tables_in_namespace
         assert len(tables_in_namespace) == 1
 
         # Drop table from namespace
-        await db.drop_table("test_table", namespace=["test_namespace"])
+        await db.drop_table("test_table", namespace_path=["test_namespace"])
 
         # Verify table no longer exists in namespace
-        tables_in_namespace = list(await db.table_names(namespace=["test_namespace"]))
+        tables_in_namespace = list(
+            await db.table_names(namespace_path=["test_namespace"])
+        )
         assert len(tables_in_namespace) == 0
 
         # Drop namespace
@@ -626,15 +647,98 @@ class TestAsyncNamespaceConnection:
             ]
         )
         for i in range(3):
-            await db.create_table(f"table{i}", schema=schema, namespace=["test_ns"])
+            await db.create_table(
+                f"table{i}", schema=schema, namespace_path=["test_ns"]
+            )
 
         # Verify tables exist in child namespace
-        table_names = await db.table_names(namespace=["test_ns"])
+        table_names = await db.table_names(namespace_path=["test_ns"])
         assert len(list(table_names)) == 3
 
         # Drop all tables in child namespace
-        await db.drop_all_tables(namespace=["test_ns"])
+        await db.drop_all_tables(namespace_path=["test_ns"])
 
         # Verify all tables are gone from child namespace
-        table_names = await db.table_names(namespace=["test_ns"])
+        table_names = await db.table_names(namespace_path=["test_ns"])
         assert len(list(table_names)) == 0
+
+
+class TestPushdownOperations:
+    """Test pushdown operations on namespace connections."""
+
+    def setup_method(self):
+        """Set up test fixtures."""
+        self.temp_dir = tempfile.mkdtemp()
+
+    def teardown_method(self):
+        """Clean up test fixtures."""
+        shutil.rmtree(self.temp_dir, ignore_errors=True)
+
+    def test_query_table_pushdown_stored(self):
+        """Test that QueryTable pushdown is stored on sync connection."""
+        db = lancedb.connect_namespace(
+            "dir",
+            {"root": self.temp_dir},
+            namespace_client_pushdown_operations=["QueryTable"],
+        )
+        assert "QueryTable" in db._pushdown_operations
+
+    def test_create_table_pushdown_stored(self):
+        """Test that CreateTable pushdown is stored on sync connection."""
+        db = lancedb.connect_namespace(
+            "dir",
+            {"root": self.temp_dir},
+            namespace_client_pushdown_operations=["CreateTable"],
+        )
+        assert "CreateTable" in db._pushdown_operations
+
+    def test_both_pushdowns_stored(self):
+        """Test that both pushdown operations can be set together."""
+        db = lancedb.connect_namespace(
+            "dir",
+            {"root": self.temp_dir},
+            namespace_client_pushdown_operations=["QueryTable", "CreateTable"],
+        )
+        assert "QueryTable" in db._pushdown_operations
+        assert "CreateTable" in db._pushdown_operations
+
+    def test_pushdown_defaults_to_empty(self):
+        """Test that pushdown operations default to empty."""
+        db = lancedb.connect_namespace("dir", {"root": self.temp_dir})
+        assert len(db._pushdown_operations) == 0
+
+
+@pytest.mark.asyncio
+class TestAsyncPushdownOperations:
+    """Test pushdown operations on async namespace connections."""
+
+    def setup_method(self):
+        """Set up test fixtures."""
+        self.temp_dir = tempfile.mkdtemp()
+
+    def teardown_method(self):
+        """Clean up test fixtures."""
+        shutil.rmtree(self.temp_dir, ignore_errors=True)
+
+    async def test_async_query_table_pushdown_stored(self):
+        """Test that QueryTable pushdown is stored on async connection."""
+        db = lancedb.connect_namespace_async(
+            "dir",
+            {"root": self.temp_dir},
+            namespace_client_pushdown_operations=["QueryTable"],
+        )
+        assert "QueryTable" in db._pushdown_operations
+
+    async def test_async_create_table_pushdown_stored(self):
+        """Test that CreateTable pushdown is stored on async connection."""
+        db = lancedb.connect_namespace_async(
+            "dir",
+            {"root": self.temp_dir},
+            namespace_client_pushdown_operations=["CreateTable"],
+        )
+        assert "CreateTable" in db._pushdown_operations
+
+    async def test_async_pushdown_defaults_to_empty(self):
+        """Test that pushdown operations default to empty on async connection."""
+        db = lancedb.connect_namespace_async("dir", {"root": self.temp_dir})
+        assert len(db._pushdown_operations) == 0

python/python/tests/test_namespace_integration.py

@@ -4,9 +4,11 @@
 """
 Integration tests for LanceDB Namespace with S3 and credential refresh.
 
-This test simulates a namespace server that returns incrementing credentials
-and verifies that the credential refresh mechanism works correctly for both
-create_table and open_table operations.
+This test uses DirectoryNamespace with native ops_metrics and vend_input_storage_options
+features to track API calls and test credential refresh mechanisms.
+
+Tests are parameterized to run with both DirectoryNamespace and a CustomNamespace
+wrapper to verify Python-Rust binding works correctly for custom implementations.
 
 Tests verify:
 - Storage options provider is auto-created and used
@@ -18,22 +20,136 @@ Tests verify:
 import copy
 import time
 import uuid
-from threading import Lock
-from typing import Dict
+from typing import Dict, Optional
 
 import pyarrow as pa
 import pytest
-from lance_namespace import (
-    CreateEmptyTableRequest,
-    CreateEmptyTableResponse,
+from lance.namespace import (
     DeclareTableRequest,
     DeclareTableResponse,
     DescribeTableRequest,
     DescribeTableResponse,
+    DirectoryNamespace,
     LanceNamespace,
 )
+from lance_namespace import (
+    CreateNamespaceRequest,
+    CreateNamespaceResponse,
+    CreateTableRequest,
+    CreateTableResponse,
+    CreateTableVersionRequest,
+    CreateTableVersionResponse,
+    DeregisterTableRequest,
+    DeregisterTableResponse,
+    DescribeNamespaceRequest,
+    DescribeNamespaceResponse,
+    DescribeTableVersionRequest,
+    DescribeTableVersionResponse,
+    DropNamespaceRequest,
+    DropNamespaceResponse,
+    DropTableRequest,
+    DropTableResponse,
+    ListNamespacesRequest,
+    ListNamespacesResponse,
+    ListTablesRequest,
+    ListTablesResponse,
+    ListTableVersionsRequest,
+    ListTableVersionsResponse,
+    NamespaceExistsRequest,
+    RegisterTableRequest,
+    RegisterTableResponse,
+    TableExistsRequest,
+)
 from lancedb.namespace import LanceNamespaceDBConnection
 
+
+class CustomNamespace(LanceNamespace):
+    """A custom namespace wrapper that delegates to DirectoryNamespace.
+
+    This class verifies that the Python-Rust binding works correctly for
+    custom namespace implementations that wrap the native DirectoryNamespace.
+    All methods simply delegate to the underlying DirectoryNamespace instance.
+    """
+
+    def __init__(self, inner: DirectoryNamespace):
+        self._inner = inner
+
+    def namespace_id(self) -> str:
+        return f"CustomNamespace[{self._inner.namespace_id()}]"
+
+    def create_namespace(
+        self, request: CreateNamespaceRequest
+    ) -> CreateNamespaceResponse:
+        return self._inner.create_namespace(request)
+
+    def describe_namespace(
+        self, request: DescribeNamespaceRequest
+    ) -> DescribeNamespaceResponse:
+        return self._inner.describe_namespace(request)
+
+    def namespace_exists(self, request: NamespaceExistsRequest) -> None:
+        return self._inner.namespace_exists(request)
+
+    def drop_namespace(self, request: DropNamespaceRequest) -> DropNamespaceResponse:
+        return self._inner.drop_namespace(request)
+
+    def list_namespaces(self, request: ListNamespacesRequest) -> ListNamespacesResponse:
+        return self._inner.list_namespaces(request)
+
+    def create_table(
+        self, request: CreateTableRequest, data: bytes
+    ) -> CreateTableResponse:
+        return self._inner.create_table(request, data)
+
+    def declare_table(self, request: DeclareTableRequest) -> DeclareTableResponse:
+        return self._inner.declare_table(request)
+
+    def describe_table(self, request: DescribeTableRequest) -> DescribeTableResponse:
+        return self._inner.describe_table(request)
+
+    def table_exists(self, request: TableExistsRequest) -> None:
+        return self._inner.table_exists(request)
+
+    def drop_table(self, request: DropTableRequest) -> DropTableResponse:
+        return self._inner.drop_table(request)
+
+    def list_tables(self, request: ListTablesRequest) -> ListTablesResponse:
+        return self._inner.list_tables(request)
+
+    def register_table(self, request: RegisterTableRequest) -> RegisterTableResponse:
+        return self._inner.register_table(request)
+
+    def deregister_table(
+        self, request: DeregisterTableRequest
+    ) -> DeregisterTableResponse:
+        return self._inner.deregister_table(request)
+
+    def list_table_versions(
+        self, request: ListTableVersionsRequest
+    ) -> ListTableVersionsResponse:
+        return self._inner.list_table_versions(request)
+
+    def describe_table_version(
+        self, request: DescribeTableVersionRequest
+    ) -> DescribeTableVersionResponse:
+        return self._inner.describe_table_version(request)
+
+    def create_table_version(
+        self, request: CreateTableVersionRequest
+    ) -> CreateTableVersionResponse:
+        return self._inner.create_table_version(request)
+
+    def retrieve_ops_metrics(self) -> Optional[Dict[str, int]]:
+        return self._inner.retrieve_ops_metrics()
+
+
+def _wrap_if_custom(ns_client: DirectoryNamespace, use_custom: bool):
+    """Wrap namespace client in CustomNamespace if use_custom is True."""
+    if use_custom:
+        return CustomNamespace(ns_client)
+    return ns_client
+
+
 # LocalStack S3 configuration
 CONFIG = {
     "allow_http": "true",
@@ -89,162 +205,88 @@ def delete_bucket(s3, bucket_name):
         pass
 
 
-class TrackingNamespace(LanceNamespace):
+def create_tracking_namespace(
+    bucket_name: str,
+    storage_options: dict,
+    credential_expires_in_seconds: int = 60,
+    use_custom: bool = False,
+):
+    """Create a DirectoryNamespace with ops metrics and credential vending enabled.
+
+    Uses native DirectoryNamespace features:
+    - ops_metrics_enabled=true: Tracks API call counts via retrieve_ops_metrics()
+    - vend_input_storage_options=true: Returns input storage options in responses
+    - vend_input_storage_options_refresh_interval_millis: Adds expires_at_millis
+
+    Args:
+        bucket_name: S3 bucket name or local path
+        storage_options: Storage options to pass through (credentials, endpoint, etc.)
+        credential_expires_in_seconds: Interval in seconds for credential expiration
+        use_custom: If True, wrap in CustomNamespace for testing custom implementations
+
+    Returns:
+        Tuple of (namespace_client, inner_namespace_client) where inner is always
+        the DirectoryNamespace (used for metrics retrieval)
     """
-    Mock namespace that wraps DirectoryNamespace and tracks API calls.
+    # Add refresh_offset_millis to storage options so that credentials are not
+    # considered expired immediately. Set to 1 second (1000ms) so that refresh
+    # checks work correctly with short-lived credentials in tests.
+    storage_options_with_refresh = dict(storage_options)
+    storage_options_with_refresh["refresh_offset_millis"] = "1000"
 
-    This namespace returns incrementing credentials with each API call to simulate
-    credential rotation. It also tracks the number of times each API is called
-    to verify caching behavior.
-    """
+    dir_props = {f"storage.{k}": v for k, v in storage_options_with_refresh.items()}
 
-    def __init__(
-        self,
-        bucket_name: str,
-        storage_options: Dict[str, str],
-        credential_expires_in_seconds: int = 60,
-    ):
-        from lance.namespace import DirectoryNamespace
+    if bucket_name.startswith("/") or bucket_name.startswith("file://"):
+        dir_props["root"] = f"{bucket_name}/namespace_root"
+    else:
+        dir_props["root"] = f"s3://{bucket_name}/namespace_root"
 
-        self.bucket_name = bucket_name
-        self.base_storage_options = storage_options
-        self.credential_expires_in_seconds = credential_expires_in_seconds
-        self.describe_call_count = 0
-        self.create_call_count = 0
-        self.lock = Lock()
+    # Enable ops metrics tracking
+    dir_props["ops_metrics_enabled"] = "true"
+    # Enable storage options vending
+    dir_props["vend_input_storage_options"] = "true"
+    # Set refresh interval in milliseconds
+    dir_props["vend_input_storage_options_refresh_interval_millis"] = str(
+        credential_expires_in_seconds * 1000
+    )
 
-        # Create underlying DirectoryNamespace with storage options
-        dir_props = {f"storage.{k}": v for k, v in storage_options.items()}
+    inner_ns_client = DirectoryNamespace(**dir_props)
+    ns_client = _wrap_if_custom(inner_ns_client, use_custom)
+    return ns_client, inner_ns_client
 
-        # Use S3 path for bucket name, local path for file paths
-        if bucket_name.startswith("/") or bucket_name.startswith("file://"):
-            dir_props["root"] = f"{bucket_name}/namespace_root"
-        else:
-            dir_props["root"] = f"s3://{bucket_name}/namespace_root"
 
-        self.inner = DirectoryNamespace(**dir_props)
+def get_describe_call_count(namespace_client) -> int:
+    """Get the number of describe_table calls made to the namespace client."""
+    return namespace_client.retrieve_ops_metrics().get("describe_table", 0)
 
-    def get_describe_call_count(self) -> int:
-        """Thread-safe getter for describe call count."""
-        with self.lock:
-            return self.describe_call_count
 
-    def get_create_call_count(self) -> int:
-        """Thread-safe getter for create call count."""
-        with self.lock:
-            return self.create_call_count
-
-    def namespace_id(self) -> str:
-        """Return namespace identifier."""
-        return f"TrackingNamespace {{ inner: {self.inner.namespace_id()} }}"
-
-    def _modify_storage_options(
-        self, storage_options: Dict[str, str], count: int
-    ) -> Dict[str, str]:
-        """
-        Add incrementing credentials with expiration timestamp.
-
-        This simulates a credential rotation system where each call returns
-        new credentials that expire after credential_expires_in_seconds.
-        """
-        # Start from base storage options (endpoint, region, allow_http, etc.)
-        # because DirectoryNamespace returns None for storage_options from
-        # describe_table/declare_table when no credential vendor is configured.
-        modified = copy.deepcopy(self.base_storage_options)
-        if storage_options:
-            modified.update(storage_options)
-
-        # Increment credentials to simulate rotation
-        modified["aws_access_key_id"] = f"AKID_{count}"
-        modified["aws_secret_access_key"] = f"SECRET_{count}"
-        modified["aws_session_token"] = f"TOKEN_{count}"
-
-        # Set expiration time
-        expires_at_millis = int(
-            (time.time() + self.credential_expires_in_seconds) * 1000
-        )
-        modified["expires_at_millis"] = str(expires_at_millis)
-
-        return modified
-
-    def declare_table(self, request: DeclareTableRequest) -> DeclareTableResponse:
-        """Track declare_table calls and inject rotating credentials."""
-        with self.lock:
-            self.create_call_count += 1
-            count = self.create_call_count
-
-        response = self.inner.declare_table(request)
-        response.storage_options = self._modify_storage_options(
-            response.storage_options, count
-        )
-
-        return response
-
-    def create_empty_table(
-        self, request: CreateEmptyTableRequest
-    ) -> CreateEmptyTableResponse:
-        """Track create_empty_table calls and inject rotating credentials."""
-        with self.lock:
-            self.create_call_count += 1
-            count = self.create_call_count
-
-        response = self.inner.create_empty_table(request)
-        response.storage_options = self._modify_storage_options(
-            response.storage_options, count
-        )
-
-        return response
-
-    def describe_table(self, request: DescribeTableRequest) -> DescribeTableResponse:
-        """Track describe_table calls and inject rotating credentials."""
-        with self.lock:
-            self.describe_call_count += 1
-            count = self.describe_call_count
-
-        response = self.inner.describe_table(request)
-        response.storage_options = self._modify_storage_options(
-            response.storage_options, count
-        )
-
-        return response
-
-    # Pass through other methods to inner namespace
-    def list_tables(self, request):
-        return self.inner.list_tables(request)
-
-    def drop_table(self, request):
-        return self.inner.drop_table(request)
-
-    def list_namespaces(self, request):
-        return self.inner.list_namespaces(request)
-
-    def create_namespace(self, request):
-        return self.inner.create_namespace(request)
-
-    def drop_namespace(self, request):
-        return self.inner.drop_namespace(request)
+def get_declare_call_count(namespace_client) -> int:
+    """Get the number of declare_table calls made to the namespace client."""
+    return namespace_client.retrieve_ops_metrics().get("declare_table", 0)
 
 
 @pytest.mark.s3_test
-def test_namespace_create_table_with_provider(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_create_table_with_provider(s3_bucket: str, use_custom: bool):
     """
     Test creating a table through namespace with storage options provider.
 
     Verifies:
-    - create_empty_table is called once to reserve location
+    - declare_table is called once to reserve location
     - Storage options provider is auto-created
     - Table can be written successfully
     - Credentials are cached during write operations
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3600,  # 1 hour
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -254,8 +296,8 @@ def test_namespace_create_table_with_provider(s3_bucket: str):
     namespace_path = [namespace_name]
 
     # Verify initial state
-    assert namespace.get_create_call_count() == 0
-    assert namespace.get_describe_call_count() == 0
+    assert get_declare_call_count(inner_ns_client) == 0
+    assert get_describe_call_count(inner_ns_client) == 0
 
     # Create table with data
     data = pa.table(
@@ -266,12 +308,12 @@ def test_namespace_create_table_with_provider(s3_bucket: str):
         }
     )
 
-    table = db.create_table(table_name, data, namespace=namespace_path)
+    table = db.create_table(table_name, data, namespace_path=namespace_path)
 
-    # Verify create_empty_table was called exactly once
-    assert namespace.get_create_call_count() == 1
+    # Verify declare_table was called exactly once
+    assert get_declare_call_count(inner_ns_client) == 1
     # describe_table should NOT be called during create in create mode
-    assert namespace.get_describe_call_count() == 0
+    assert get_describe_call_count(inner_ns_client) == 0
 
     # Verify table was created successfully
     assert table.name == table_name
@@ -281,7 +323,8 @@ def test_namespace_create_table_with_provider(s3_bucket: str):
 
 
 @pytest.mark.s3_test
-def test_namespace_open_table_with_provider(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_open_table_with_provider(s3_bucket: str, use_custom: bool):
     """
     Test opening a table through namespace with storage options provider.
 
@@ -293,13 +336,14 @@ def test_namespace_open_table_with_provider(s3_bucket: str):
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3600,
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -317,21 +361,21 @@ def test_namespace_open_table_with_provider(s3_bucket: str):
         }
     )
 
-    db.create_table(table_name, data, namespace=namespace_path)
+    db.create_table(table_name, data, namespace_path=namespace_path)
 
-    initial_create_count = namespace.get_create_call_count()
-    assert initial_create_count == 1
+    initial_declare_count = get_declare_call_count(inner_ns_client)
+    assert initial_declare_count == 1
 
     # Open the table
-    opened_table = db.open_table(table_name, namespace=namespace_path)
+    opened_table = db.open_table(table_name, namespace_path=namespace_path)
 
     # Verify describe_table was called exactly once
-    assert namespace.get_describe_call_count() == 1
-    # create_empty_table should not be called again
-    assert namespace.get_create_call_count() == initial_create_count
+    assert get_describe_call_count(inner_ns_client) == 1
+    # declare_table should not be called again
+    assert get_declare_call_count(inner_ns_client) == initial_declare_count
 
     # Perform multiple read operations
-    describe_count_after_open = namespace.get_describe_call_count()
+    describe_count_after_open = get_describe_call_count(inner_ns_client)
 
     for _ in range(3):
         result = opened_table.to_pandas()
@@ -340,11 +384,12 @@ def test_namespace_open_table_with_provider(s3_bucket: str):
         assert count == 5
 
     # Verify credentials were cached (no additional describe_table calls)
-    assert namespace.get_describe_call_count() == describe_count_after_open
+    assert get_describe_call_count(inner_ns_client) == describe_count_after_open
 
 
 @pytest.mark.s3_test
-def test_namespace_credential_refresh_on_read(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_credential_refresh_on_read(s3_bucket: str, use_custom: bool):
     """
     Test credential refresh when credentials expire during read operations.
 
@@ -355,13 +400,14 @@ def test_namespace_credential_refresh_on_read(s3_bucket: str):
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3,  # Short expiration for testing
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -378,16 +424,16 @@ def test_namespace_credential_refresh_on_read(s3_bucket: str):
         }
     )
 
-    db.create_table(table_name, data, namespace=namespace_path)
+    db.create_table(table_name, data, namespace_path=namespace_path)
 
     # Open table (triggers describe_table)
-    opened_table = db.open_table(table_name, namespace=namespace_path)
+    opened_table = db.open_table(table_name, namespace_path=namespace_path)
 
     # Perform an immediate read (should use credentials from open)
     result = opened_table.to_pandas()
     assert len(result) == 3
 
-    describe_count_after_first_read = namespace.get_describe_call_count()
+    describe_count_after_first_read = get_describe_call_count(inner_ns_client)
 
     # Wait for credentials to expire (3 seconds + buffer)
     time.sleep(5)
@@ -396,7 +442,7 @@ def test_namespace_credential_refresh_on_read(s3_bucket: str):
     result = opened_table.to_pandas()
     assert len(result) == 3
 
-    describe_count_after_refresh = namespace.get_describe_call_count()
+    describe_count_after_refresh = get_describe_call_count(inner_ns_client)
     # Verify describe_table was called again (credential refresh)
     refresh_delta = describe_count_after_refresh - describe_count_after_first_read
 
@@ -409,7 +455,8 @@ def test_namespace_credential_refresh_on_read(s3_bucket: str):
 
 
 @pytest.mark.s3_test
-def test_namespace_credential_refresh_on_write(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_credential_refresh_on_write(s3_bucket: str, use_custom: bool):
     """
     Test credential refresh when credentials expire during write operations.
 
@@ -420,13 +467,14 @@ def test_namespace_credential_refresh_on_write(s3_bucket: str):
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3,  # Short expiration
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -443,7 +491,7 @@ def test_namespace_credential_refresh_on_write(s3_bucket: str):
         }
     )
 
-    table = db.create_table(table_name, initial_data, namespace=namespace_path)
+    table = db.create_table(table_name, initial_data, namespace_path=namespace_path)
 
     # Add more data (should use cached credentials)
     new_data = pa.table(
@@ -471,24 +519,26 @@ def test_namespace_credential_refresh_on_write(s3_bucket: str):
 
 
 @pytest.mark.s3_test
-def test_namespace_overwrite_mode(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_overwrite_mode(s3_bucket: str, use_custom: bool):
     """
     Test creating table in overwrite mode with credential tracking.
 
     Verifies:
-    - First create calls create_empty_table exactly once
+    - First create calls declare_table exactly once
     - Overwrite mode calls describe_table exactly once to check existence
     - Storage options provider works in overwrite mode
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3600,
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -505,11 +555,11 @@ def test_namespace_overwrite_mode(s3_bucket: str):
         }
     )
 
-    table = db.create_table(table_name, data1, namespace=namespace_path)
-    # Exactly one create_empty_table call for initial create
-    assert namespace.get_create_call_count() == 1
+    table = db.create_table(table_name, data1, namespace_path=namespace_path)
+    # Exactly one declare_table call for initial create
+    assert get_declare_call_count(inner_ns_client) == 1
     # No describe_table calls in create mode
-    assert namespace.get_describe_call_count() == 0
+    assert get_describe_call_count(inner_ns_client) == 0
     assert table.count_rows() == 2
 
     # Overwrite the table
@@ -521,14 +571,14 @@ def test_namespace_overwrite_mode(s3_bucket: str):
     )
 
     table2 = db.create_table(
-        table_name, data2, namespace=namespace_path, mode="overwrite"
+        table_name, data2, namespace_path=namespace_path, mode="overwrite"
     )
 
-    # Should still have only 1 create_empty_table call
+    # Should still have only 1 declare_table call
     # (overwrite reuses location from describe_table)
-    assert namespace.get_create_call_count() == 1
+    assert get_declare_call_count(inner_ns_client) == 1
     # Should have called describe_table exactly once to get existing table location
-    assert namespace.get_describe_call_count() == 1
+    assert get_describe_call_count(inner_ns_client) == 1
 
     # Verify new data
     assert table2.count_rows() == 3
@@ -537,7 +587,8 @@ def test_namespace_overwrite_mode(s3_bucket: str):
 
 
 @pytest.mark.s3_test
-def test_namespace_multiple_tables(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_multiple_tables(s3_bucket: str, use_custom: bool):
     """
     Test creating and opening multiple tables in the same namespace.
 
@@ -548,13 +599,14 @@ def test_namespace_multiple_tables(s3_bucket: str):
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3600,
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -564,22 +616,22 @@ def test_namespace_multiple_tables(s3_bucket: str):
     # Create first table
     table1_name = f"table1_{uuid.uuid4().hex}"
     data1 = pa.table({"id": [1, 2], "value": [10, 20]})
-    db.create_table(table1_name, data1, namespace=namespace_path)
+    db.create_table(table1_name, data1, namespace_path=namespace_path)
 
     # Create second table
     table2_name = f"table2_{uuid.uuid4().hex}"
     data2 = pa.table({"id": [3, 4], "value": [30, 40]})
-    db.create_table(table2_name, data2, namespace=namespace_path)
+    db.create_table(table2_name, data2, namespace_path=namespace_path)
 
-    # Should have 2 create calls (one per table)
-    assert namespace.get_create_call_count() == 2
+    # Should have 2 declare calls (one per table)
+    assert get_declare_call_count(inner_ns_client) == 2
 
     # Open both tables
-    opened1 = db.open_table(table1_name, namespace=namespace_path)
-    opened2 = db.open_table(table2_name, namespace=namespace_path)
+    opened1 = db.open_table(table1_name, namespace_path=namespace_path)
+    opened2 = db.open_table(table2_name, namespace_path=namespace_path)
 
     # Should have 2 describe calls (one per open)
-    assert namespace.get_describe_call_count() == 2
+    assert get_describe_call_count(inner_ns_client) == 2
 
     # Verify both tables work independently
     assert opened1.count_rows() == 2
@@ -593,7 +645,8 @@ def test_namespace_multiple_tables(s3_bucket: str):
 
 
 @pytest.mark.s3_test
-def test_namespace_with_schema_only(s3_bucket: str):
+@pytest.mark.parametrize("use_custom", [False, True], ids=["DirectoryNS", "CustomNS"])
+def test_namespace_with_schema_only(s3_bucket: str, use_custom: bool):
     """
     Test creating empty table with schema only (no data).
 
@@ -604,13 +657,14 @@ def test_namespace_with_schema_only(s3_bucket: str):
     """
     storage_options = copy.deepcopy(CONFIG)
 
-    namespace = TrackingNamespace(
+    ns_client, inner_ns_client = create_tracking_namespace(
         bucket_name=s3_bucket,
         storage_options=storage_options,
         credential_expires_in_seconds=3600,
+        use_custom=use_custom,
     )
 
-    db = LanceNamespaceDBConnection(namespace)
+    db = LanceNamespaceDBConnection(ns_client)
 
     # Create unique namespace for this test
     namespace_name = f"test_ns_{uuid.uuid4().hex[:8]}"
@@ -628,12 +682,12 @@ def test_namespace_with_schema_only(s3_bucket: str):
         ]
     )
 
-    table = db.create_table(table_name, schema=schema, namespace=namespace_path)
+    table = db.create_table(table_name, schema=schema, namespace_path=namespace_path)
 
-    # Should have called create_empty_table once
-    assert namespace.get_create_call_count() == 1
+    # Should have called declare_table once
+    assert get_declare_call_count(inner_ns_client) == 1
     # Should NOT have called describe_table in create mode
-    assert namespace.get_describe_call_count() == 0
+    assert get_describe_call_count(inner_ns_client) == 0
 
     # Verify empty table
     assert table.count_rows() == 0

python/python/tests/test_query.py

@@ -30,6 +30,7 @@ from lancedb.query import (
     PhraseQuery,
     Query,
     FullTextSearchQuery,
+    ensure_vector_query,
 )
 from lancedb.rerankers.cross_encoder import CrossEncoderReranker
 from lancedb.table import AsyncTable, LanceTable
@@ -1501,6 +1502,18 @@ def test_search_empty_table(mem_db):
     assert results == []
 
 
+def test_ensure_vector_query_empty_list():
+    """Regression: ensure_vector_query used to return instead of raise ValueError."""
+    with pytest.raises(ValueError, match="non-empty"):
+        ensure_vector_query([])
+
+
+def test_ensure_vector_query_nested_empty_list():
+    """Regression: ensure_vector_query used to return instead of raise ValueError."""
+    with pytest.raises(ValueError, match="non-empty"):
+        ensure_vector_query([[]])
+
+
 def test_fast_search(tmp_path):
     db = lancedb.connect(tmp_path)
 

python/python/tests/test_remote_db.py

@@ -1201,6 +1201,18 @@ async def test_header_provider_overrides_static_headers():
         await db.table_names()
 
 
+def test_close():
+    """Test that close() works without AttributeError."""
+    import asyncio
+
+    def handler(req):
+        req.send_response(200)
+        req.end_headers()
+
+    with mock_lancedb_connection(handler) as db:
+        asyncio.run(db.close())
+
+
 @pytest.mark.parametrize("exception", [KeyboardInterrupt, SystemExit, GeneratorExit])
 def test_background_loop_cancellation(exception):
     """Test that BackgroundEventLoop.run() cancels the future on interrupt."""

python/python/tests/test_table.py

@@ -527,6 +527,36 @@ async def test_add_async(mem_db_async: AsyncConnection):
     assert await table.count_rows() == 3
 
 
+def test_add_overwrite_infers_vector_schema(mem_db: DBConnection):
+    """Overwrite should infer vector columns the same way create_table does.
+
+    Regression test for https://github.com/lancedb/lancedb/issues/3183
+    """
+    table = mem_db.create_table(
+        "test_overwrite_vec",
+        data=[
+            {"vector": [1.0, 2.0, 3.0, 4.0], "item": "foo"},
+            {"vector": [5.0, 6.0, 7.0, 8.0], "item": "bar"},
+        ],
+    )
+    # create_table infers vector as fixed_size_list<float32, 4>
+    original_type = table.schema.field("vector").type
+    assert pa.types.is_fixed_size_list(original_type)
+
+    # overwrite with plain Python lists (PyArrow infers list<double>)
+    table.add(
+        [
+            {"vector": [10.0, 20.0, 30.0, 40.0], "item": "baz"},
+        ],
+        mode="overwrite",
+    )
+    # overwrite should infer vector column the same way as create_table
+    new_type = table.schema.field("vector").type
+    assert pa.types.is_fixed_size_list(new_type), (
+        f"Expected fixed_size_list after overwrite, got {new_type}"
+    )
+
+
 def test_add_progress_callback(mem_db: DBConnection):
     table = mem_db.create_table(
         "test",
@@ -2078,7 +2108,7 @@ def test_stats(mem_db: DBConnection):
     stats = table.stats()
     print(f"{stats=}")
     assert stats == {
-        "total_bytes": 38,
+        "total_bytes": 60,
         "num_rows": 2,
         "num_indices": 0,
         "fragment_stats": {
@@ -2143,3 +2173,33 @@ def test_table_uri(tmp_path):
     db = lancedb.connect(tmp_path)
     table = db.create_table("my_table", data=[{"x": 0}])
     assert table.uri == str(tmp_path / "my_table.lance")
+
+
+def test_sanitize_data_metadata_not_stripped():
+    """Regression test: dict.update() returns None, so assigning its result
+    would silently replace metadata with None, causing with_metadata(None)
+    to strip all schema metadata from the target schema."""
+    from lancedb.table import _sanitize_data
+
+    schema = pa.schema(
+        [pa.field("x", pa.int64())],
+        metadata={b"existing_key": b"existing_value"},
+    )
+    batch = pa.record_batch([pa.array([1, 2, 3])], schema=schema)
+
+    # Use a different field type so the reader and target schemas differ,
+    # forcing _cast_to_target_schema to rebuild the schema with the
+    # target's metadata (instead of taking the fast-path).
+    target_schema = pa.schema(
+        [pa.field("x", pa.int32())],
+        metadata={b"existing_key": b"existing_value"},
+    )
+
+    reader = pa.RecordBatchReader.from_batches(schema, [batch])
+    metadata = {b"new_key": b"new_value"}
+    result = _sanitize_data(reader, target_schema=target_schema, metadata=metadata)
+
+    result_schema = result.schema
+    assert result_schema.metadata is not None
+    assert result_schema.metadata[b"existing_key"] == b"existing_value"
+    assert result_schema.metadata[b"new_key"] == b"new_value"

python/src/connection.rs

@@ -17,8 +17,9 @@ use pyo3::{
 use pyo3_async_runtimes::tokio::future_into_py;
 
 use crate::{
-    error::PythonErrorExt, namespace::extract_namespace_arc,
-    storage_options::py_object_to_storage_options_provider, table::Table,
+    error::PythonErrorExt,
+    namespace::{create_namespace_storage_options_provider, extract_namespace_arc},
+    table::Table,
 };
 
 #[pyclass]
@@ -87,16 +88,16 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (namespace=vec![], start_after=None, limit=None))]
+    #[pyo3(signature = (namespace_path=None, start_after=None, limit=None))]
     pub fn table_names(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         start_after: Option<String>,
         limit: Option<u32>,
     ) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
         let mut op = inner.table_names();
-        op = op.namespace(namespace);
+        op = op.namespace(namespace_path.unwrap_or_default());
         if let Some(start_after) = start_after {
             op = op.start_after(start_after);
         }
@@ -107,34 +108,43 @@ impl Connection {
     }
 
     #[allow(clippy::too_many_arguments)]
-    #[pyo3(signature = (name, mode, data, namespace=vec![], storage_options=None, storage_options_provider=None, location=None))]
+    #[pyo3(signature = (name, mode, data, namespace_path=None, storage_options=None, location=None, namespace_client=None))]
     pub fn create_table<'a>(
         self_: PyRef<'a, Self>,
         name: String,
         mode: &str,
         data: Bound<'_, PyAny>,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         storage_options: Option<HashMap<String, String>>,
-        storage_options_provider: Option<Py<PyAny>>,
         location: Option<String>,
+        namespace_client: Option<Py<PyAny>>,
     ) -> PyResult<Bound<'a, PyAny>> {
         let inner = self_.get_inner()?.clone();
+        let py = self_.py();
 
         let mode = Self::parse_create_mode_str(mode)?;
 
         let batches: Box<dyn arrow::array::RecordBatchReader + Send> =
             Box::new(ArrowArrayStreamReader::from_pyarrow_bound(&data)?);
 
-        let mut builder = inner.create_table(name, batches).mode(mode);
+        let ns_path = namespace_path.clone().unwrap_or_default();
+        let mut builder = inner.create_table(name.clone(), batches).mode(mode);
 
-        builder = builder.namespace(namespace);
+        builder = builder.namespace(ns_path.clone());
         if let Some(storage_options) = storage_options {
             builder = builder.storage_options(storage_options);
         }
-        if let Some(provider_obj) = storage_options_provider {
-            let provider = py_object_to_storage_options_provider(provider_obj)?;
+
+        // Auto-create storage options provider from namespace_client
+        if let Some(ns_obj) = namespace_client {
+            let ns_client = extract_namespace_arc(py, ns_obj)?;
+            // Create table_id by combining namespace_path with table name
+            let mut table_id = ns_path;
+            table_id.push(name);
+            let provider = create_namespace_storage_options_provider(ns_client, table_id);
             builder = builder.storage_options_provider(provider);
         }
+
         if let Some(location) = location {
             builder = builder.location(location);
         }
@@ -146,33 +156,44 @@ impl Connection {
     }
 
     #[allow(clippy::too_many_arguments)]
-    #[pyo3(signature = (name, mode, schema, namespace=vec![], storage_options=None, storage_options_provider=None, location=None))]
+    #[pyo3(signature = (name, mode, schema, namespace_path=None, storage_options=None, location=None, namespace_client=None))]
     pub fn create_empty_table<'a>(
         self_: PyRef<'a, Self>,
         name: String,
         mode: &str,
         schema: Bound<'_, PyAny>,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         storage_options: Option<HashMap<String, String>>,
-        storage_options_provider: Option<Py<PyAny>>,
         location: Option<String>,
+        namespace_client: Option<Py<PyAny>>,
     ) -> PyResult<Bound<'a, PyAny>> {
         let inner = self_.get_inner()?.clone();
+        let py = self_.py();
 
         let mode = Self::parse_create_mode_str(mode)?;
 
         let schema = Schema::from_pyarrow_bound(&schema)?;
 
-        let mut builder = inner.create_empty_table(name, Arc::new(schema)).mode(mode);
+        let ns_path = namespace_path.clone().unwrap_or_default();
+        let mut builder = inner
+            .create_empty_table(name.clone(), Arc::new(schema))
+            .mode(mode);
 
-        builder = builder.namespace(namespace);
+        builder = builder.namespace(ns_path.clone());
         if let Some(storage_options) = storage_options {
             builder = builder.storage_options(storage_options);
         }
-        if let Some(provider_obj) = storage_options_provider {
-            let provider = py_object_to_storage_options_provider(provider_obj)?;
+
+        // Auto-create storage options provider from namespace_client
+        if let Some(ns_obj) = namespace_client {
+            let ns_client = extract_namespace_arc(py, ns_obj)?;
+            // Create table_id by combining namespace_path with table name
+            let mut table_id = ns_path;
+            table_id.push(name);
+            let provider = create_namespace_storage_options_provider(ns_client, table_id);
             builder = builder.storage_options_provider(provider);
         }
+
         if let Some(location) = location {
             builder = builder.location(location);
         }
@@ -184,45 +205,44 @@ impl Connection {
     }
 
     #[allow(clippy::too_many_arguments)]
-    #[pyo3(signature = (name, namespace=vec![], storage_options = None, storage_options_provider=None, index_cache_size = None, location=None, namespace_client=None, managed_versioning=None))]
+    #[pyo3(signature = (name, namespace_path=None, storage_options=None, index_cache_size=None, location=None, namespace_client=None, managed_versioning=None))]
     pub fn open_table(
         self_: PyRef<'_, Self>,
         name: String,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         storage_options: Option<HashMap<String, String>>,
-        storage_options_provider: Option<Py<PyAny>>,
         index_cache_size: Option<u32>,
         location: Option<String>,
         namespace_client: Option<Py<PyAny>>,
         managed_versioning: Option<bool>,
     ) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
+        let py = self_.py();
 
-        let mut builder = inner.open_table(name);
-        builder = builder.namespace(namespace.clone());
+        let ns_path = namespace_path.clone().unwrap_or_default();
+        let mut builder = inner.open_table(name.clone());
+        builder = builder.namespace(ns_path.clone());
         if let Some(storage_options) = storage_options {
             builder = builder.storage_options(storage_options);
         }
-        if let Some(provider_obj) = storage_options_provider {
-            let provider = py_object_to_storage_options_provider(provider_obj)?;
+
+        // Auto-create storage options provider from namespace_client
+        if let Some(ns_obj) = namespace_client {
+            let ns_client = extract_namespace_arc(py, ns_obj)?;
+            // Create table_id by combining namespace_path with table name
+            let mut table_id = ns_path;
+            table_id.push(name);
+            let provider = create_namespace_storage_options_provider(ns_client.clone(), table_id);
             builder = builder.storage_options_provider(provider);
+            builder = builder.namespace_client(ns_client);
         }
+
         if let Some(index_cache_size) = index_cache_size {
             builder = builder.index_cache_size(index_cache_size);
         }
         if let Some(location) = location {
             builder = builder.location(location);
         }
-        // Extract namespace client from Python object if provided
-        let ns_client = if let Some(ns_obj) = namespace_client {
-            let py = self_.py();
-            Some(extract_namespace_arc(py, ns_obj)?)
-        } else {
-            None
-        };
-        if let Some(ns_client) = ns_client {
-            builder = builder.namespace_client(ns_client);
-        }
         // Pass managed_versioning if provided to avoid redundant describe_table call
         if let Some(enabled) = managed_versioning {
             builder = builder.managed_versioning(enabled);
@@ -234,12 +254,12 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (target_table_name, source_uri, target_namespace=vec![], source_version=None, source_tag=None, is_shallow=true))]
+    #[pyo3(signature = (target_table_name, source_uri, target_namespace_path=None, source_version=None, source_tag=None, is_shallow=true))]
     pub fn clone_table(
         self_: PyRef<'_, Self>,
         target_table_name: String,
         source_uri: String,
-        target_namespace: Vec<String>,
+        target_namespace_path: Option<Vec<String>>,
         source_version: Option<u64>,
         source_tag: Option<String>,
         is_shallow: bool,
@@ -247,7 +267,7 @@ impl Connection {
         let inner = self_.get_inner()?.clone();
 
         let mut builder = inner.clone_table(target_table_name, source_uri);
-        builder = builder.target_namespace(target_namespace);
+        builder = builder.target_namespace(target_namespace_path.unwrap_or_default());
         if let Some(version) = source_version {
             builder = builder.source_version(version);
         }
@@ -262,52 +282,56 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (cur_name, new_name, cur_namespace=vec![], new_namespace=vec![]))]
+    #[pyo3(signature = (cur_name, new_name, cur_namespace_path=None, new_namespace_path=None))]
     pub fn rename_table(
         self_: PyRef<'_, Self>,
         cur_name: String,
         new_name: String,
-        cur_namespace: Vec<String>,
-        new_namespace: Vec<String>,
+        cur_namespace_path: Option<Vec<String>>,
+        new_namespace_path: Option<Vec<String>>,
     ) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
+        let cur_ns_path = cur_namespace_path.unwrap_or_default();
+        let new_ns_path = new_namespace_path.unwrap_or_default();
         future_into_py(self_.py(), async move {
             inner
-                .rename_table(cur_name, new_name, &cur_namespace, &new_namespace)
+                .rename_table(cur_name, new_name, &cur_ns_path, &new_ns_path)
                 .await
                 .infer_error()
         })
     }
 
-    #[pyo3(signature = (name, namespace=vec![]))]
+    #[pyo3(signature = (name, namespace_path=None))]
     pub fn drop_table(
         self_: PyRef<'_, Self>,
         name: String,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
     ) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
+        let ns_path = namespace_path.unwrap_or_default();
         future_into_py(self_.py(), async move {
-            inner.drop_table(name, &namespace).await.infer_error()
+            inner.drop_table(name, &ns_path).await.infer_error()
         })
     }
 
-    #[pyo3(signature = (namespace=vec![],))]
+    #[pyo3(signature = (namespace_path=None,))]
     pub fn drop_all_tables(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
     ) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
+        let ns_path = namespace_path.unwrap_or_default();
         future_into_py(self_.py(), async move {
-            inner.drop_all_tables(&namespace).await.infer_error()
+            inner.drop_all_tables(&ns_path).await.infer_error()
         })
     }
 
     // Namespace management methods
 
-    #[pyo3(signature = (namespace=vec![], page_token=None, limit=None))]
+    #[pyo3(signature = (namespace_path=None, page_token=None, limit=None))]
     pub fn list_namespaces(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         page_token: Option<String>,
         limit: Option<u32>,
     ) -> PyResult<Bound<'_, PyAny>> {
@@ -316,11 +340,7 @@ impl Connection {
         future_into_py(py, async move {
             use lance_namespace::models::ListNamespacesRequest;
             let request = ListNamespacesRequest {
-                id: if namespace.is_empty() {
-                    None
-                } else {
-                    Some(namespace)
-                },
+                id: namespace_path,
                 page_token,
                 limit: limit.map(|l| l as i32),
                 ..Default::default()
@@ -335,10 +355,10 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (namespace, mode=None, properties=None))]
+    #[pyo3(signature = (namespace_path, mode=None, properties=None))]
     pub fn create_namespace(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Vec<String>,
         mode: Option<String>,
         properties: Option<std::collections::HashMap<String, String>>,
     ) -> PyResult<Bound<'_, PyAny>> {
@@ -354,11 +374,7 @@ impl Connection {
                 _ => None,
             });
             let request = CreateNamespaceRequest {
-                id: if namespace.is_empty() {
-                    None
-                } else {
-                    Some(namespace)
-                },
+                id: Some(namespace_path),
                 mode: mode_str,
                 properties,
                 ..Default::default()
@@ -372,10 +388,10 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (namespace, mode=None, behavior=None))]
+    #[pyo3(signature = (namespace_path, mode=None, behavior=None))]
     pub fn drop_namespace(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Vec<String>,
         mode: Option<String>,
         behavior: Option<String>,
     ) -> PyResult<Bound<'_, PyAny>> {
@@ -395,11 +411,7 @@ impl Connection {
                 _ => None,
             });
             let request = DropNamespaceRequest {
-                id: if namespace.is_empty() {
-                    None
-                } else {
-                    Some(namespace)
-                },
+                id: Some(namespace_path),
                 mode: mode_str,
                 behavior: behavior_str,
                 ..Default::default()
@@ -414,21 +426,17 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (namespace,))]
+    #[pyo3(signature = (namespace_path,))]
     pub fn describe_namespace(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Vec<String>,
     ) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
         let py = self_.py();
         future_into_py(py, async move {
             use lance_namespace::models::DescribeNamespaceRequest;
             let request = DescribeNamespaceRequest {
-                id: if namespace.is_empty() {
-                    None
-                } else {
-                    Some(namespace)
-                },
+                id: Some(namespace_path),
                 ..Default::default()
             };
             let response = inner.describe_namespace(request).await.infer_error()?;
@@ -440,10 +448,10 @@ impl Connection {
         })
     }
 
-    #[pyo3(signature = (namespace=vec![], page_token=None, limit=None))]
+    #[pyo3(signature = (namespace_path=None, page_token=None, limit=None))]
     pub fn list_tables(
         self_: PyRef<'_, Self>,
-        namespace: Vec<String>,
+        namespace_path: Option<Vec<String>>,
         page_token: Option<String>,
         limit: Option<u32>,
     ) -> PyResult<Bound<'_, PyAny>> {
@@ -452,11 +460,7 @@ impl Connection {
         future_into_py(py, async move {
             use lance_namespace::models::ListTablesRequest;
             let request = ListTablesRequest {
-                id: if namespace.is_empty() {
-                    None
-                } else {
-                    Some(namespace)
-                },
+                id: namespace_path,
                 page_token,
                 limit: limit.map(|l| l as i32),
                 ..Default::default()

python/src/expr.rs

@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright The LanceDB Authors
+
+//! PyO3 bindings for the LanceDB expression builder API.
+//!
+//! This module exposes [`PyExpr`] and helper free functions so Python can
+//! build type-safe filter / projection expressions that map directly to
+//! DataFusion [`Expr`] nodes, bypassing SQL string parsing.
+
+use arrow::{datatypes::DataType, pyarrow::PyArrowType};
+use lancedb::expr::{DfExpr, col as ldb_col, contains, expr_cast, lit as df_lit, lower, upper};
+use pyo3::{Bound, PyAny, PyResult, exceptions::PyValueError, prelude::*, pyfunction};
+
+/// A type-safe DataFusion expression.
+///
+/// Instances are constructed via the free functions [`expr_col`] and
+/// [`expr_lit`] and combined with the methods on this struct.  On the Python
+/// side a thin wrapper class (`lancedb.expr.Expr`) delegates to these methods
+/// and adds Python operator overloads.
+#[pyclass(name = "PyExpr")]
+#[derive(Clone)]
+pub struct PyExpr(pub DfExpr);
+
+#[pymethods]
+impl PyExpr {
+    // ── comparisons ──────────────────────────────────────────────────────────
+
+    fn eq(&self, other: &Self) -> Self {
+        Self(self.0.clone().eq(other.0.clone()))
+    }
+
+    fn ne(&self, other: &Self) -> Self {
+        Self(self.0.clone().not_eq(other.0.clone()))
+    }
+
+    fn lt(&self, other: &Self) -> Self {
+        Self(self.0.clone().lt(other.0.clone()))
+    }
+
+    fn lte(&self, other: &Self) -> Self {
+        Self(self.0.clone().lt_eq(other.0.clone()))
+    }
+
+    fn gt(&self, other: &Self) -> Self {
+        Self(self.0.clone().gt(other.0.clone()))
+    }
+
+    fn gte(&self, other: &Self) -> Self {
+        Self(self.0.clone().gt_eq(other.0.clone()))
+    }
+
+    // ── logical ──────────────────────────────────────────────────────────────
+
+    fn and_(&self, other: &Self) -> Self {
+        Self(self.0.clone().and(other.0.clone()))
+    }
+
+    fn or_(&self, other: &Self) -> Self {
+        Self(self.0.clone().or(other.0.clone()))
+    }
+
+    fn not_(&self) -> Self {
+        use std::ops::Not;
+        Self(self.0.clone().not())
+    }
+
+    // ── arithmetic ───────────────────────────────────────────────────────────
+
+    fn add(&self, other: &Self) -> Self {
+        use std::ops::Add;
+        Self(self.0.clone().add(other.0.clone()))
+    }
+
+    fn sub(&self, other: &Self) -> Self {
+        use std::ops::Sub;
+        Self(self.0.clone().sub(other.0.clone()))
+    }
+
+    fn mul(&self, other: &Self) -> Self {
+        use std::ops::Mul;
+        Self(self.0.clone().mul(other.0.clone()))
+    }
+
+    fn div(&self, other: &Self) -> Self {
+        use std::ops::Div;
+        Self(self.0.clone().div(other.0.clone()))
+    }
+
+    // ── string functions ─────────────────────────────────────────────────────
+
+    /// Convert string column to lowercase.
+    fn lower(&self) -> Self {
+        Self(lower(self.0.clone()))
+    }
+
+    /// Convert string column to uppercase.
+    fn upper(&self) -> Self {
+        Self(upper(self.0.clone()))
+    }
+
+    /// Test whether the string contains `substr`.
+    fn contains(&self, substr: &Self) -> Self {
+        Self(contains(self.0.clone(), substr.0.clone()))
+    }
+
+    // ── type cast ────────────────────────────────────────────────────────────
+
+    /// Cast the expression to `data_type`.
+    ///
+    /// `data_type` must be a PyArrow `DataType` (e.g. `pa.int32()`).
+    /// On the Python side, `lancedb.expr.Expr.cast` also accepts type name
+    /// strings via `pa.lib.ensure_type` before forwarding here.
+    fn cast(&self, data_type: PyArrowType<DataType>) -> Self {
+        Self(expr_cast(self.0.clone(), data_type.0))
+    }
+
+    // ── utilities ────────────────────────────────────────────────────────────
+
+    /// Render the expression as a SQL string (useful for debugging).
+    fn to_sql(&self) -> PyResult<String> {
+        lancedb::expr::expr_to_sql_string(&self.0).map_err(|e| PyValueError::new_err(e.to_string()))
+    }
+
+    fn __repr__(&self) -> PyResult<String> {
+        let sql =
+            lancedb::expr::expr_to_sql_string(&self.0).unwrap_or_else(|_| "<expr>".to_string());
+        Ok(format!("PyExpr({})", sql))
+    }
+}
+
+// ── free functions ────────────────────────────────────────────────────────────
+
+/// Create a column reference expression.
+///
+/// The column name is preserved exactly as given (case-sensitive), so
+/// `col("firstName")` correctly references a field named `firstName`.
+#[pyfunction]
+pub fn expr_col(name: &str) -> PyExpr {
+    PyExpr(ldb_col(name))
+}
+
+/// Create a literal value expression.
+///
+/// Supported Python types: `bool`, `int`, `float`, `str`.
+#[pyfunction]
+pub fn expr_lit(value: Bound<'_, PyAny>) -> PyResult<PyExpr> {
+    // bool must be checked before int because bool is a subclass of int in Python
+    if let Ok(b) = value.extract::<bool>() {
+        return Ok(PyExpr(df_lit(b)));
+    }
+    if let Ok(i) = value.extract::<i64>() {
+        return Ok(PyExpr(df_lit(i)));
+    }
+    if let Ok(f) = value.extract::<f64>() {
+        return Ok(PyExpr(df_lit(f)));
+    }
+    if let Ok(s) = value.extract::<String>() {
+        return Ok(PyExpr(df_lit(s)));
+    }
+    Err(PyValueError::new_err(format!(
+        "unsupported literal type: {}. Supported: bool, int, float, str",
+        value.get_type().name()?
+    )))
+}
+
+/// Call an arbitrary registered SQL function by name.
+///
+/// See `lancedb::expr::func` for the list of supported function names.
+#[pyfunction]
+pub fn expr_func(name: &str, args: Vec<PyExpr>) -> PyResult<PyExpr> {
+    let df_args: Vec<DfExpr> = args.into_iter().map(|e| e.0).collect();
+    lancedb::expr::func(name, df_args)
+        .map(PyExpr)
+        .map_err(|e| PyValueError::new_err(e.to_string()))
+}

python/src/lib.rs

@@ -4,6 +4,7 @@
 use arrow::RecordBatchStream;
 use connection::{Connection, connect};
 use env_logger::Env;
+use expr::{PyExpr, expr_col, expr_func, expr_lit};
 use index::IndexConfig;
 use permutation::{PyAsyncPermutationBuilder, PyPermutationReader};
 use pyo3::{
@@ -21,13 +22,13 @@ use table::{
 pub mod arrow;
 pub mod connection;
 pub mod error;
+pub mod expr;
 pub mod header;
 pub mod index;
 pub mod namespace;
 pub mod permutation;
 pub mod query;
 pub mod session;
-pub mod storage_options;
 pub mod table;
 pub mod util;
 
@@ -55,10 +56,14 @@ pub fn _lancedb(_py: Python, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<UpdateResult>()?;
     m.add_class::<PyAsyncPermutationBuilder>()?;
     m.add_class::<PyPermutationReader>()?;
+    m.add_class::<PyExpr>()?;
     m.add_function(wrap_pyfunction!(connect, m)?)?;
     m.add_function(wrap_pyfunction!(permutation::async_permutation_builder, m)?)?;
     m.add_function(wrap_pyfunction!(util::validate_table_name, m)?)?;
     m.add_function(wrap_pyfunction!(query::fts_query_to_json, m)?)?;
+    m.add_function(wrap_pyfunction!(expr_col, m)?)?;
+    m.add_function(wrap_pyfunction!(expr_lit, m)?)?;
+    m.add_function(wrap_pyfunction!(expr_func, m)?)?;
     m.add("__version__", env!("CARGO_PKG_VERSION"))?;
     Ok(())
 }

python/src/namespace.rs

@@ -8,6 +8,7 @@ use std::sync::Arc;
 
 use async_trait::async_trait;
 use bytes::Bytes;
+use lance_io::object_store::{LanceNamespaceStorageOptionsProvider, StorageOptionsProvider};
 use lance_namespace::LanceNamespace as LanceNamespaceTrait;
 use lance_namespace::models::*;
 use pyo3::prelude::*;
@@ -694,3 +695,21 @@ pub fn extract_namespace_arc(
     let ns_ref = ns.bind(py);
     PyLanceNamespace::create_arc(py, ns_ref)
 }
+
+/// Create a LanceNamespaceStorageOptionsProvider from a namespace client and table ID.
+///
+/// This creates a Rust storage options provider that fetches credentials from the
+/// namespace's describe_table() method, enabling automatic credential refresh.
+///
+/// # Arguments
+/// * `namespace_client` - The namespace client (wrapped PyLanceNamespace)
+/// * `table_id` - Full table identifier (namespace_path + table_name)
+pub fn create_namespace_storage_options_provider(
+    namespace_client: Arc<dyn LanceNamespaceTrait>,
+    table_id: Vec<String>,
+) -> Arc<dyn StorageOptionsProvider> {
+    Arc::new(LanceNamespaceStorageOptionsProvider::new(
+        namespace_client,
+        table_id,
+    ))
+}

python/src/query.rs

@@ -35,12 +35,10 @@ use pyo3::types::PyList;
 use pyo3::types::{PyDict, PyString};
 use pyo3::{FromPyObject, exceptions::PyRuntimeError};
 use pyo3::{PyErr, pyclass};
-use pyo3::{
-    exceptions::{PyNotImplementedError, PyValueError},
-    intern,
-};
+use pyo3::{exceptions::PyValueError, intern};
 use pyo3_async_runtimes::tokio::future_into_py;
 
+use crate::expr::PyExpr;
 use crate::util::parse_distance_type;
 use crate::{arrow::RecordBatchStream, util::PyLanceDB};
 use crate::{error::PythonErrorExt, index::class_name};
@@ -344,9 +342,13 @@ impl<'py> IntoPyObject<'py> for PyQueryFilter {
 
     fn into_pyobject(self, py: pyo3::Python<'py>) -> PyResult<Self::Output> {
         match self.0 {
-            QueryFilter::Datafusion(_) => Err(PyNotImplementedError::new_err(
-                "Datafusion filter has no conversion to Python",
-            )),
+            QueryFilter::Datafusion(expr) => {
+                // Serialize the DataFusion expression to a SQL string so that
+                // callers (e.g. remote tables) see the same format as Sql.
+                let sql = lancedb::expr::expr_to_sql_string(&expr)
+                    .map_err(|e| PyRuntimeError::new_err(e.to_string()))?;
+                Ok(sql.into_pyobject(py)?.into_any())
+            }
             QueryFilter::Sql(sql) => Ok(sql.into_pyobject(py)?.into_any()),
             QueryFilter::Substrait(substrait) => Ok(substrait.into_pyobject(py)?.into_any()),
         }
@@ -370,10 +372,20 @@ impl Query {
         self.inner = self.inner.clone().only_if(predicate);
     }
 
+    pub fn where_expr(&mut self, expr: PyExpr) {
+        self.inner = self.inner.clone().only_if_expr(expr.0);
+    }
+
     pub fn select(&mut self, columns: Vec<(String, String)>) {
         self.inner = self.inner.clone().select(Select::dynamic(&columns));
     }
 
+    pub fn select_expr(&mut self, columns: Vec<(String, PyExpr)>) {
+        let pairs: Vec<(String, lancedb::expr::DfExpr)> =
+            columns.into_iter().map(|(name, e)| (name, e.0)).collect();
+        self.inner = self.inner.clone().select(Select::Expr(pairs));
+    }
+
     pub fn select_columns(&mut self, columns: Vec<String>) {
         self.inner = self.inner.clone().select(Select::columns(&columns));
     }
@@ -607,10 +619,20 @@ impl FTSQuery {
         self.inner = self.inner.clone().only_if(predicate);
     }
 
+    pub fn where_expr(&mut self, expr: PyExpr) {
+        self.inner = self.inner.clone().only_if_expr(expr.0);
+    }
+
     pub fn select(&mut self, columns: Vec<(String, String)>) {
         self.inner = self.inner.clone().select(Select::dynamic(&columns));
     }
 
+    pub fn select_expr(&mut self, columns: Vec<(String, PyExpr)>) {
+        let pairs: Vec<(String, lancedb::expr::DfExpr)> =
+            columns.into_iter().map(|(name, e)| (name, e.0)).collect();
+        self.inner = self.inner.clone().select(Select::Expr(pairs));
+    }
+
     pub fn select_columns(&mut self, columns: Vec<String>) {
         self.inner = self.inner.clone().select(Select::columns(&columns));
     }
@@ -725,6 +747,10 @@ impl VectorQuery {
         self.inner = self.inner.clone().only_if(predicate);
     }
 
+    pub fn where_expr(&mut self, expr: PyExpr) {
+        self.inner = self.inner.clone().only_if_expr(expr.0);
+    }
+
     pub fn add_query_vector(&mut self, vector: Bound<'_, PyAny>) -> PyResult<()> {
         let data: ArrayData = ArrayData::from_pyarrow_bound(&vector)?;
         let array = make_array(data);
@@ -736,6 +762,12 @@ impl VectorQuery {
         self.inner = self.inner.clone().select(Select::dynamic(&columns));
     }
 
+    pub fn select_expr(&mut self, columns: Vec<(String, PyExpr)>) {
+        let pairs: Vec<(String, lancedb::expr::DfExpr)> =
+            columns.into_iter().map(|(name, e)| (name, e.0)).collect();
+        self.inner = self.inner.clone().select(Select::Expr(pairs));
+    }
+
     pub fn select_columns(&mut self, columns: Vec<String>) {
         self.inner = self.inner.clone().select(Select::columns(&columns));
     }
@@ -890,11 +922,21 @@ impl HybridQuery {
         self.inner_fts.r#where(predicate);
     }
 
+    pub fn where_expr(&mut self, expr: PyExpr) {
+        self.inner_vec.where_expr(expr.clone());
+        self.inner_fts.where_expr(expr);
+    }
+
     pub fn select(&mut self, columns: Vec<(String, String)>) {
         self.inner_vec.select(columns.clone());
         self.inner_fts.select(columns);
     }
 
+    pub fn select_expr(&mut self, columns: Vec<(String, PyExpr)>) {
+        self.inner_vec.select_expr(columns.clone());
+        self.inner_fts.select_expr(columns);
+    }
+
     pub fn select_columns(&mut self, columns: Vec<String>) {
         self.inner_vec.select_columns(columns.clone());
         self.inner_fts.select_columns(columns);

python/src/storage_options.rs

@@ -1,137 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-// SPDX-FileCopyrightText: Copyright The LanceDB Authors
-
-//! PyO3 bindings for StorageOptionsProvider
-//!
-//! This module provides the bridge between Python StorageOptionsProvider objects
-//! and Rust's StorageOptionsProvider trait, enabling automatic credential refresh.
-
-use std::collections::HashMap;
-use std::sync::Arc;
-
-use async_trait::async_trait;
-use lance_io::object_store::StorageOptionsProvider;
-use pyo3::prelude::*;
-use pyo3::types::PyDict;
-
-/// Internal wrapper around a Python object implementing StorageOptionsProvider
-pub struct PyStorageOptionsProvider {
-    /// The Python object implementing fetch_storage_options()
-    inner: Py<PyAny>,
-}
-
-impl Clone for PyStorageOptionsProvider {
-    fn clone(&self) -> Self {
-        Python::attach(|py| Self {
-            inner: self.inner.clone_ref(py),
-        })
-    }
-}
-
-impl PyStorageOptionsProvider {
-    pub fn new(obj: Py<PyAny>) -> PyResult<Self> {
-        Python::attach(|py| {
-            // Verify the object has a fetch_storage_options method
-            if !obj.bind(py).hasattr("fetch_storage_options")? {
-                return Err(pyo3::exceptions::PyTypeError::new_err(
-                    "StorageOptionsProvider must implement fetch_storage_options() method",
-                ));
-            }
-            Ok(Self { inner: obj })
-        })
-    }
-}
-
-/// Wrapper that implements the Rust StorageOptionsProvider trait
-pub struct PyStorageOptionsProviderWrapper {
-    py_provider: PyStorageOptionsProvider,
-}
-
-impl PyStorageOptionsProviderWrapper {
-    pub fn new(py_provider: PyStorageOptionsProvider) -> Self {
-        Self { py_provider }
-    }
-}
-
-#[async_trait]
-impl StorageOptionsProvider for PyStorageOptionsProviderWrapper {
-    async fn fetch_storage_options(&self) -> lance_core::Result<Option<HashMap<String, String>>> {
-        // Call Python method from async context using spawn_blocking
-        let py_provider = self.py_provider.clone();
-
-        tokio::task::spawn_blocking(move || {
-            Python::attach(|py| {
-                // Call the Python fetch_storage_options method
-                let result = py_provider
-                    .inner
-                    .bind(py)
-                    .call_method0("fetch_storage_options")
-                    .map_err(|e| lance_core::Error::io_source(Box::new(std::io::Error::other(format!(
-                        "Failed to call fetch_storage_options: {}",
-                        e
-                    )))))?;
-
-                // If result is None, return None
-                if result.is_none() {
-                    return Ok(None);
-                }
-
-                // Extract the result dict - should be a flat Map<String, String>
-                let result_dict = result.downcast::<PyDict>().map_err(|_| {
-                    lance_core::Error::invalid_input(
-                        "fetch_storage_options() must return a dict of string key-value pairs or None",
-                    )
-                })?;
-
-                // Convert all entries to HashMap<String, String>
-                let mut storage_options = HashMap::new();
-                for (key, value) in result_dict.iter() {
-                    let key_str: String = key.extract().map_err(|e| {
-                        lance_core::Error::invalid_input(format!("Storage option key must be a string: {}", e))
-                    })?;
-                    let value_str: String = value.extract().map_err(|e| {
-                        lance_core::Error::invalid_input(format!("Storage option value must be a string: {}", e))
-                    })?;
-                    storage_options.insert(key_str, value_str);
-                }
-
-                Ok(Some(storage_options))
-            })
-        })
-        .await
-        .map_err(|e| lance_core::Error::io_source(Box::new(std::io::Error::other(format!(
-            "Task join error: {}",
-            e
-        )))))?
-    }
-
-    fn provider_id(&self) -> String {
-        Python::attach(|py| {
-            // Call provider_id() method on the Python object
-            let obj = self.py_provider.inner.bind(py);
-            obj.call_method0("provider_id")
-                .and_then(|result| result.extract::<String>())
-                .unwrap_or_else(|e| {
-                    // If provider_id() fails, construct a fallback ID
-                    format!("PyStorageOptionsProvider(error: {})", e)
-                })
-        })
-    }
-}
-
-impl std::fmt::Debug for PyStorageOptionsProviderWrapper {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "PyStorageOptionsProviderWrapper({})", self.provider_id())
-    }
-}
-
-/// Convert a Python object to an Arc<dyn StorageOptionsProvider>
-///
-/// This is the main entry point for converting Python StorageOptionsProvider objects
-/// to Rust trait objects that can be used by the Lance ecosystem.
-pub fn py_object_to_storage_options_provider(
-    py_obj: Py<PyAny>,
-) -> PyResult<Arc<dyn StorageOptionsProvider>> {
-    let py_provider = PyStorageOptionsProvider::new(py_obj)?;
-    Ok(Arc::new(PyStorageOptionsProviderWrapper::new(py_provider)))
-}

python/tests/test_expr.py

@@ -0,0 +1,387 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright The LanceDB Authors
+
+"""Tests for the type-safe expression builder API."""
+
+import pytest
+import pyarrow as pa
+import lancedb
+from lancedb.expr import Expr, col, lit, func
+
+
+# ── unit tests for Expr construction ─────────────────────────────────────────
+
+
+class TestExprConstruction:
+    def test_col_returns_expr(self):
+        e = col("age")
+        assert isinstance(e, Expr)
+
+    def test_lit_int(self):
+        e = lit(42)
+        assert isinstance(e, Expr)
+
+    def test_lit_float(self):
+        e = lit(3.14)
+        assert isinstance(e, Expr)
+
+    def test_lit_str(self):
+        e = lit("hello")
+        assert isinstance(e, Expr)
+
+    def test_lit_bool(self):
+        e = lit(True)
+        assert isinstance(e, Expr)
+
+    def test_lit_unsupported_type_raises(self):
+        with pytest.raises(Exception):
+            lit([1, 2, 3])
+
+    def test_func(self):
+        e = func("lower", col("name"))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "lower(name)"
+
+    def test_func_unknown_raises(self):
+        with pytest.raises(Exception):
+            func("not_a_real_function", col("x"))
+
+
+class TestExprOperators:
+    def test_eq_operator(self):
+        e = col("x") == lit(1)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(x = 1)"
+
+    def test_ne_operator(self):
+        e = col("x") != lit(1)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(x <> 1)"
+
+    def test_lt_operator(self):
+        e = col("age") < lit(18)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(age < 18)"
+
+    def test_le_operator(self):
+        e = col("age") <= lit(18)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(age <= 18)"
+
+    def test_gt_operator(self):
+        e = col("age") > lit(18)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(age > 18)"
+
+    def test_ge_operator(self):
+        e = col("age") >= lit(18)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(age >= 18)"
+
+    def test_and_operator(self):
+        e = (col("age") > lit(18)) & (col("status") == lit("active"))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "((age > 18) AND (status = 'active'))"
+
+    def test_or_operator(self):
+        e = (col("a") == lit(1)) | (col("b") == lit(2))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "((a = 1) OR (b = 2))"
+
+    def test_invert_operator(self):
+        e = ~(col("active") == lit(True))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "NOT (active = true)"
+
+    def test_add_operator(self):
+        e = col("x") + lit(1)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(x + 1)"
+
+    def test_sub_operator(self):
+        e = col("x") - lit(1)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(x - 1)"
+
+    def test_mul_operator(self):
+        e = col("price") * lit(1.1)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(price * 1.1)"
+
+    def test_div_operator(self):
+        e = col("total") / lit(2)
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(total / 2)"
+
+    def test_radd(self):
+        e = lit(1) + col("x")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(1 + x)"
+
+    def test_rmul(self):
+        e = lit(2) * col("x")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(2 * x)"
+
+    def test_coerce_plain_int(self):
+        # Operators should auto-wrap plain Python values via lit()
+        e = col("age") > 18
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(age > 18)"
+
+    def test_coerce_plain_str(self):
+        e = col("name") == "alice"
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(name = 'alice')"
+
+
+class TestExprStringMethods:
+    def test_lower(self):
+        e = col("name").lower()
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "lower(name)"
+
+    def test_upper(self):
+        e = col("name").upper()
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "upper(name)"
+
+    def test_contains(self):
+        e = col("text").contains(lit("hello"))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "contains(text, 'hello')"
+
+    def test_contains_with_str_coerce(self):
+        e = col("text").contains("hello")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "contains(text, 'hello')"
+
+    def test_chained_lower_eq(self):
+        e = col("name").lower() == lit("alice")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(lower(name) = 'alice')"
+
+
+class TestExprCast:
+    def test_cast_string(self):
+        e = col("id").cast("string")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "CAST(id AS VARCHAR)"
+
+    def test_cast_int32(self):
+        e = col("score").cast("int32")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "CAST(score AS INTEGER)"
+
+    def test_cast_float64(self):
+        e = col("val").cast("float64")
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "CAST(val AS DOUBLE)"
+
+    def test_cast_pyarrow_type(self):
+        e = col("score").cast(pa.int32())
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "CAST(score AS INTEGER)"
+
+    def test_cast_pyarrow_float64(self):
+        e = col("val").cast(pa.float64())
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "CAST(val AS DOUBLE)"
+
+    def test_cast_pyarrow_string(self):
+        e = col("id").cast(pa.string())
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "CAST(id AS VARCHAR)"
+
+    def test_cast_pyarrow_and_string_equivalent(self):
+        # pa.int32() and "int32" should produce equivalent SQL
+        sql_str = col("x").cast("int32").to_sql()
+        sql_pa = col("x").cast(pa.int32()).to_sql()
+        assert sql_str == sql_pa
+
+
+class TestExprNamedMethods:
+    def test_eq_method(self):
+        e = col("x").eq(lit(1))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(x = 1)"
+
+    def test_gt_method(self):
+        e = col("x").gt(lit(0))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "(x > 0)"
+
+    def test_and_method(self):
+        e = col("x").gt(lit(0)).and_(col("y").lt(lit(10)))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "((x > 0) AND (y < 10))"
+
+    def test_or_method(self):
+        e = col("x").eq(lit(1)).or_(col("x").eq(lit(2)))
+        assert isinstance(e, Expr)
+        assert e.to_sql() == "((x = 1) OR (x = 2))"
+
+
+class TestExprRepr:
+    def test_repr(self):
+        e = col("age") > lit(18)
+        assert repr(e) == "Expr((age > 18))"
+
+    def test_to_sql(self):
+        e = col("age") > 18
+        assert e.to_sql() == "(age > 18)"
+
+    def test_unhashable(self):
+        e = col("x")
+        with pytest.raises(TypeError):
+            {e: 1}
+
+
+# ── integration tests: end-to-end query against a real table ─────────────────
+
+
+@pytest.fixture
+def simple_table(tmp_path):
+    db = lancedb.connect(str(tmp_path))
+    data = pa.table(
+        {
+            "id": [1, 2, 3, 4, 5],
+            "name": ["Alice", "Bob", "Charlie", "alice", "BOB"],
+            "age": [25, 17, 30, 22, 15],
+            "score": [1.5, 2.0, 3.5, 4.0, 0.5],
+        }
+    )
+    return db.create_table("test", data)
+
+
+class TestExprFilter:
+    def test_simple_gt_filter(self, simple_table):
+        result = simple_table.search().where(col("age") > lit(20)).to_arrow()
+        assert result.num_rows == 3  # ages 25, 30, 22
+
+    def test_compound_and_filter(self, simple_table):
+        result = (
+            simple_table.search()
+            .where((col("age") > lit(18)) & (col("score") > lit(2.0)))
+            .to_arrow()
+        )
+        assert result.num_rows == 2  # (30, 3.5) and (22, 4.0)
+
+    def test_string_equality_filter(self, simple_table):
+        result = simple_table.search().where(col("name") == lit("Bob")).to_arrow()
+        assert result.num_rows == 1
+
+    def test_or_filter(self, simple_table):
+        result = (
+            simple_table.search()
+            .where((col("age") < lit(18)) | (col("age") > lit(28)))
+            .to_arrow()
+        )
+        assert result.num_rows == 3  # ages 17, 30, 15
+
+    def test_coercion_no_lit(self, simple_table):
+        # Python values should be auto-coerced
+        result = simple_table.search().where(col("age") > 20).to_arrow()
+        assert result.num_rows == 3
+
+    def test_string_sql_still_works(self, simple_table):
+        # Backwards compatibility: plain strings still accepted
+        result = simple_table.search().where("age > 20").to_arrow()
+        assert result.num_rows == 3
+
+
+class TestExprProjection:
+    def test_select_with_expr(self, simple_table):
+        result = (
+            simple_table.search()
+            .select({"double_score": col("score") * lit(2)})
+            .to_arrow()
+        )
+        assert "double_score" in result.schema.names
+
+    def test_select_mixed_str_and_expr(self, simple_table):
+        result = (
+            simple_table.search()
+            .select({"id": "id", "double_score": col("score") * lit(2)})
+            .to_arrow()
+        )
+        assert "id" in result.schema.names
+        assert "double_score" in result.schema.names
+
+    def test_select_list_of_columns(self, simple_table):
+        # Plain list of str still works
+        result = simple_table.search().select(["id", "name"]).to_arrow()
+        assert result.schema.names == ["id", "name"]
+
+
+# ── column name edge cases ────────────────────────────────────────────────────
+
+
+class TestColNaming:
+    """Unit tests verifying that col() preserves identifiers exactly.
+
+    Identifiers that need quoting (camelCase, spaces, leading digits, unicode)
+    are wrapped in backticks to match the lance SQL parser's dialect.
+    """
+
+    def test_camel_case_preserved_in_sql(self):
+        # camelCase is quoted with backticks so the case round-trips correctly.
+        assert col("firstName").to_sql() == "`firstName`"
+
+    def test_camel_case_in_expression(self):
+        assert (col("firstName") > lit(18)).to_sql() == "(`firstName` > 18)"
+
+    def test_space_in_name_quoted(self):
+        assert col("first name").to_sql() == "`first name`"
+
+    def test_space_in_expression(self):
+        assert (col("first name") == lit("A")).to_sql() == "(`first name` = 'A')"
+
+    def test_leading_digit_quoted(self):
+        assert col("2fast").to_sql() == "`2fast`"
+
+    def test_unicode_quoted(self):
+        assert col("名前").to_sql() == "`名前`"
+
+    def test_snake_case_unquoted(self):
+        # Plain snake_case needs no quoting.
+        assert col("first_name").to_sql() == "first_name"
+
+
+@pytest.fixture
+def special_col_table(tmp_path):
+    db = lancedb.connect(str(tmp_path))
+    data = pa.table(
+        {
+            "firstName": ["Alice", "Bob", "Charlie"],
+            "first name": ["A", "B", "C"],
+            "score": [10, 20, 30],
+        }
+    )
+    return db.create_table("special", data)
+
+
+class TestColNamingIntegration:
+    def test_camel_case_filter(self, special_col_table):
+        result = (
+            special_col_table.search()
+            .where(col("firstName") == lit("Alice"))
+            .to_arrow()
+        )
+        assert result.num_rows == 1
+        assert result["firstName"][0].as_py() == "Alice"
+
+    def test_space_in_col_filter(self, special_col_table):
+        result = (
+            special_col_table.search().where(col("first name") == lit("B")).to_arrow()
+        )
+        assert result.num_rows == 1
+
+    def test_camel_case_projection(self, special_col_table):
+        result = (
+            special_col_table.search()
+            .select({"upper_name": col("firstName").upper()})
+            .to_arrow()
+        )
+        assert "upper_name" in result.schema.names
+        assert sorted(result["upper_name"].to_pylist()) == ["ALICE", "BOB", "CHARLIE"]

python/uv.lock

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 [[package]]
@@ -1251,6 +1251,7 @@ dependencies = [
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 [[package]]
@@ -3767,7 +3770,7 @@ crypto = [
 
 [[package]]
 name = "pylance"
-version = "2.0.0"
+version = "4.0.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "lance-namespace" },
@@ -3776,12 +3779,12 @@ dependencies = [
     { name = "pyarrow" },
 ]
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-    { url = "https://files.pythonhosted.org/packages/3d/b7/0674bea6e33a3edf466afa6d28271c495996a6f287f4426dd20d3cc08fcc/pylance-2.0.0-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:c0397d7b9e7da2bbcc15c13edc52698a988f10e30ddb7577bebe82ec5deb82eb", size = 54124374, upload-time = "2026-02-05T20:01:43.278Z" },
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 [[package]]

rust/lancedb/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb"
-version = "0.27.1"
+version = "0.27.2"
 edition.workspace = true
 description = "LanceDB: A serverless, low-latency vector database for AI applications"
 license.workspace = true

rust/lancedb/src/connection.rs

@@ -101,9 +101,9 @@ impl TableNamesBuilder {
         self
     }
 
-    /// Set the namespace to list tables from
-    pub fn namespace(mut self, namespace: Vec<String>) -> Self {
-        self.request.namespace = namespace;
+    /// Set the namespace path to list tables from
+    pub fn namespace(mut self, namespace_path: Vec<String>) -> Self {
+        self.request.namespace_path = namespace_path;
         self
     }
 
@@ -131,7 +131,7 @@ impl OpenTableBuilder {
             parent,
             request: OpenTableRequest {
                 name,
-                namespace: vec![],
+                namespace_path: vec![],
                 index_cache_size: None,
                 lance_read_params: None,
                 location: None,
@@ -206,9 +206,9 @@ impl OpenTableBuilder {
         self
     }
 
-    /// Set the namespace for the table
-    pub fn namespace(mut self, namespace: Vec<String>) -> Self {
-        self.request.namespace = namespace;
+    /// Set the namespace path for the table
+    pub fn namespace(mut self, namespace_path: Vec<String>) -> Self {
+        self.request.namespace_path = namespace_path;
         self
     }
 
@@ -303,9 +303,9 @@ impl CloneTableBuilder {
         self
     }
 
-    /// Set the target namespace for the cloned table
-    pub fn target_namespace(mut self, namespace: Vec<String>) -> Self {
-        self.request.target_namespace = namespace;
+    /// Set the target namespace path for the cloned table
+    pub fn target_namespace(mut self, namespace_path: Vec<String>) -> Self {
+        self.request.target_namespace_path = namespace_path;
         self
     }
 
@@ -456,15 +456,15 @@ impl Connection {
         &self,
         old_name: impl AsRef<str>,
         new_name: impl AsRef<str>,
-        cur_namespace: &[String],
-        new_namespace: &[String],
+        cur_namespace_path: &[String],
+        new_namespace_path: &[String],
     ) -> Result<()> {
         self.internal
             .rename_table(
                 old_name.as_ref(),
                 new_name.as_ref(),
-                cur_namespace,
-                new_namespace,
+                cur_namespace_path,
+                new_namespace_path,
             )
             .await
     }
@@ -478,9 +478,11 @@ impl Connection {
     ///
     /// # Arguments
     /// * `name` - The name of the table to drop
-    /// * `namespace` - The namespace to drop the table from
-    pub async fn drop_table(&self, name: impl AsRef<str>, namespace: &[String]) -> Result<()> {
-        self.internal.drop_table(name.as_ref(), namespace).await
+    /// * `namespace_path` - The namespace path to drop the table from
+    pub async fn drop_table(&self, name: impl AsRef<str>, namespace_path: &[String]) -> Result<()> {
+        self.internal
+            .drop_table(name.as_ref(), namespace_path)
+            .await
     }
 
     /// Drop the database
@@ -494,9 +496,9 @@ impl Connection {
     /// Drops all tables in the database
     ///
     /// # Arguments
-    /// * `namespace` - The namespace to drop all tables from. Empty slice represents root namespace.
-    pub async fn drop_all_tables(&self, namespace: &[String]) -> Result<()> {
-        self.internal.drop_all_tables(namespace).await
+    /// * `namespace_path` - The namespace path to drop all tables from. Empty slice represents root namespace.
+    pub async fn drop_all_tables(&self, namespace_path: &[String]) -> Result<()> {
+        self.internal.drop_all_tables(namespace_path).await
     }
 
     /// List immediate child namespace names in the given namespace
@@ -862,6 +864,21 @@ pub fn connect(uri: &str) -> ConnectBuilder {
     ConnectBuilder::new(uri)
 }
 
+use std::collections::HashSet;
+
+/// Operations that can be pushed down to the namespace server.
+///
+/// These operations will be executed on the namespace server instead of locally
+/// when enabled via [`ConnectNamespaceBuilder::pushdown_operations`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum PushdownOperation {
+    /// Execute queries on the namespace server via `query_table()` instead of locally.
+    QueryTable,
+    /// Execute table creation on the namespace server via `create_table()`
+    /// instead of using `declare_table` + local write.
+    CreateTable,
+}
+
 pub struct ConnectNamespaceBuilder {
     ns_impl: String,
     properties: HashMap<String, String>,
@@ -869,7 +886,7 @@ pub struct ConnectNamespaceBuilder {
     read_consistency_interval: Option<std::time::Duration>,
     embedding_registry: Option<Arc<dyn EmbeddingRegistry>>,
     session: Option<Arc<lance::session::Session>>,
-    server_side_query_enabled: bool,
+    pushdown_operations: HashSet<PushdownOperation>,
 }
 
 impl ConnectNamespaceBuilder {
@@ -881,7 +898,7 @@ impl ConnectNamespaceBuilder {
             read_consistency_interval: None,
             embedding_registry: None,
             session: None,
-            server_side_query_enabled: false,
+            pushdown_operations: HashSet::new(),
         }
     }
 
@@ -936,15 +953,30 @@ impl ConnectNamespaceBuilder {
         self
     }
 
-    /// Enable server-side query execution.
+    /// Add operations to push down to the namespace server.
     ///
-    /// When enabled, queries will be executed on the namespace server instead of
-    /// locally. This can improve performance by reducing data transfer and
-    /// leveraging server-side compute resources.
+    /// When operations are added, they will be executed on the namespace server
+    /// instead of locally. This can improve performance by reducing data transfer
+    /// and leveraging server-side compute resources.
     ///
-    /// Default is `false` (queries executed locally).
-    pub fn server_side_query(mut self, enabled: bool) -> Self {
-        self.server_side_query_enabled = enabled;
+    /// Available operations:
+    /// - [`PushdownOperation::QueryTable`]: Execute queries via `namespace.query_table()`
+    /// - [`PushdownOperation::CreateTable`]: Execute table creation via `namespace.create_table()`
+    ///
+    /// By default, no operations are pushed down (all executed locally).
+    pub fn pushdown_operation(mut self, operation: PushdownOperation) -> Self {
+        self.pushdown_operations.insert(operation);
+        self
+    }
+
+    /// Add multiple operations to push down to the namespace server.
+    ///
+    /// See [`Self::pushdown_operation`] for details.
+    pub fn pushdown_operations(
+        mut self,
+        operations: impl IntoIterator<Item = PushdownOperation>,
+    ) -> Self {
+        self.pushdown_operations.extend(operations);
         self
     }
 
@@ -959,7 +991,7 @@ impl ConnectNamespaceBuilder {
                 self.storage_options,
                 self.read_consistency_interval,
                 self.session,
-                self.server_side_query_enabled,
+                self.pushdown_operations,
             )
             .await?,
         );

rust/lancedb/src/connection/create_table.rs

@@ -111,9 +111,9 @@ impl CreateTableBuilder {
         Ok(self)
     }
 
-    /// Set the namespace for the table
-    pub fn namespace(mut self, namespace: Vec<String>) -> Self {
-        self.request.namespace = namespace;
+    /// Set the namespace path for the table
+    pub fn namespace(mut self, namespace_path: Vec<String>) -> Self {
+        self.request.namespace_path = namespace_path;
         self
     }
 

rust/lancedb/src/database.rs

@@ -40,8 +40,8 @@ pub trait DatabaseOptions {
 /// A request to list names of tables in the database (deprecated, use ListTablesRequest)
 #[derive(Clone, Debug, Default)]
 pub struct TableNamesRequest {
-    /// The namespace to list tables in. Empty list represents root namespace.
-    pub namespace: Vec<String>,
+    /// The namespace path to list tables in. Empty list represents root namespace.
+    pub namespace_path: Vec<String>,
     /// If present, only return names that come lexicographically after the supplied
     /// value.
     ///
@@ -56,8 +56,8 @@ pub struct TableNamesRequest {
 #[derive(Clone)]
 pub struct OpenTableRequest {
     pub name: String,
-    /// The namespace to open the table from. Empty list represents root namespace.
-    pub namespace: Vec<String>,
+    /// The namespace path to open the table from. Empty list represents root namespace.
+    pub namespace_path: Vec<String>,
     pub index_cache_size: Option<u32>,
     pub lance_read_params: Option<ReadParams>,
     /// Optional custom location for the table. If not provided, the database will
@@ -76,7 +76,7 @@ impl std::fmt::Debug for OpenTableRequest {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("OpenTableRequest")
             .field("name", &self.name)
-            .field("namespace", &self.namespace)
+            .field("namespace_path", &self.namespace_path)
             .field("index_cache_size", &self.index_cache_size)
             .field("lance_read_params", &self.lance_read_params)
             .field("location", &self.location)
@@ -115,8 +115,8 @@ impl CreateTableMode {
 pub struct CreateTableRequest {
     /// The name of the new table
     pub name: String,
-    /// The namespace to create the table in. Empty list represents root namespace.
-    pub namespace: Vec<String>,
+    /// The namespace path to create the table in. Empty list represents root namespace.
+    pub namespace_path: Vec<String>,
     /// Initial data to write to the table, can be empty.
     pub data: Box<dyn Scannable>,
     /// The mode to use when creating the table
@@ -135,7 +135,7 @@ impl CreateTableRequest {
     pub fn new(name: String, data: Box<dyn Scannable>) -> Self {
         Self {
             name,
-            namespace: vec![],
+            namespace_path: vec![],
             data,
             mode: CreateTableMode::default(),
             write_options: WriteOptions::default(),
@@ -155,8 +155,8 @@ impl CreateTableRequest {
 pub struct CloneTableRequest {
     /// The name of the target table to create
     pub target_table_name: String,
-    /// The namespace for the target table. Empty list represents root namespace.
-    pub target_namespace: Vec<String>,
+    /// The namespace path for the target table. Empty list represents root namespace.
+    pub target_namespace_path: Vec<String>,
     /// The URI of the source table to clone from.
     pub source_uri: String,
     /// Optional version of the source table to clone.
@@ -175,7 +175,7 @@ impl CloneTableRequest {
     pub fn new(target_table_name: String, source_uri: String) -> Self {
         Self {
             target_table_name,
-            target_namespace: vec![],
+            target_namespace_path: vec![],
             source_uri,
             source_version: None,
             source_tag: None,
@@ -251,13 +251,13 @@ pub trait Database:
         &self,
         cur_name: &str,
         new_name: &str,
-        cur_namespace: &[String],
-        new_namespace: &[String],
+        cur_namespace_path: &[String],
+        new_namespace_path: &[String],
     ) -> Result<()>;
     /// Drop a table in the database
-    async fn drop_table(&self, name: &str, namespace: &[String]) -> Result<()>;
+    async fn drop_table(&self, name: &str, namespace_path: &[String]) -> Result<()>;
     /// Drop all tables in the database
-    async fn drop_all_tables(&self, namespace: &[String]) -> Result<()>;
+    async fn drop_all_tables(&self, namespace_path: &[String]) -> Result<()>;
     fn as_any(&self) -> &dyn std::any::Any;
 
     /// Get the equivalent namespace client of this database

rust/lancedb/src/database/listing.rs

@@ -3,6 +3,7 @@
 
 //! Provides the `ListingDatabase`, a simple database where tables are folders in a directory
 
+use std::collections::HashSet;
 use std::fs::create_dir_all;
 use std::path::Path;
 use std::{collections::HashMap, sync::Arc};
@@ -653,7 +654,7 @@ impl ListingDatabase {
     async fn handle_table_exists(
         &self,
         table_name: &str,
-        namespace: Vec<String>,
+        namespace_path: Vec<String>,
         mode: CreateTableMode,
         data_schema: &arrow_schema::Schema,
     ) -> Result<Arc<dyn BaseTable>> {
@@ -664,7 +665,7 @@ impl ListingDatabase {
             CreateTableMode::ExistOk(callback) => {
                 let req = OpenTableRequest {
                     name: table_name.to_string(),
-                    namespace: namespace.clone(),
+                    namespace_path: namespace_path.clone(),
                     index_cache_size: None,
                     lance_read_params: None,
                     location: None,
@@ -751,7 +752,7 @@ impl Database for ListingDatabase {
     }
 
     async fn table_names(&self, request: TableNamesRequest) -> Result<Vec<String>> {
-        if !request.namespace.is_empty() {
+        if !request.namespace_path.is_empty() {
             return Err(Error::NotSupported {
                 message: "Namespace parameter is not supported for listing database. Only root namespace is supported.".into(),
             });
@@ -838,7 +839,7 @@ impl Database for ListingDatabase {
 
     async fn create_table(&self, request: CreateTableRequest) -> Result<Arc<dyn BaseTable>> {
         // When namespace is not empty, location must be provided
-        if !request.namespace.is_empty() && request.location.is_none() {
+        if !request.namespace_path.is_empty() && request.location.is_none() {
             return Err(Error::InvalidInput {
                 message: "Location must be provided when namespace is not empty".into(),
             });
@@ -864,13 +865,13 @@ impl Database for ListingDatabase {
         match NativeTable::create(
             &table_uri,
             &request.name,
-            request.namespace.clone(),
+            request.namespace_path.clone(),
             request.data,
             self.store_wrapper.clone(),
             Some(write_params),
             self.read_consistency_interval,
             request.namespace_client,
-            false, // server_side_query_enabled - listing database doesn't support server-side queries
+            HashSet::new(), // listing database doesn't support server-side queries
         )
         .await
         {
@@ -878,7 +879,7 @@ impl Database for ListingDatabase {
             Err(Error::TableAlreadyExists { .. }) => {
                 self.handle_table_exists(
                     &request.name,
-                    request.namespace.clone(),
+                    request.namespace_path.clone(),
                     request.mode,
                     &data_schema,
                 )
@@ -889,7 +890,7 @@ impl Database for ListingDatabase {
     }
 
     async fn clone_table(&self, request: CloneTableRequest) -> Result<Arc<dyn BaseTable>> {
-        if !request.target_namespace.is_empty() {
+        if !request.target_namespace_path.is_empty() {
             return Err(Error::NotSupported {
                 message: "Namespace parameter is not supported for listing database. Only root namespace is supported.".into(),
             });
@@ -944,13 +945,13 @@ impl Database for ListingDatabase {
         let cloned_table = NativeTable::open_with_params(
             &target_uri,
             &request.target_table_name,
-            request.target_namespace,
+            request.target_namespace_path,
             self.store_wrapper.clone(),
             None,
             self.read_consistency_interval,
             request.namespace_client,
-            false, // server_side_query_enabled - listing database doesn't support server-side queries
-            None,  // managed_versioning - will be queried if namespace_client is provided
+            HashSet::new(), // listing database doesn't support server-side queries
+            None,           // managed_versioning - will be queried if namespace_client is provided
         )
         .await?;
 
@@ -959,7 +960,7 @@ impl Database for ListingDatabase {
 
     async fn open_table(&self, mut request: OpenTableRequest) -> Result<Arc<dyn BaseTable>> {
         // When namespace is not empty, location must be provided
-        if !request.namespace.is_empty() && request.location.is_none() {
+        if !request.namespace_path.is_empty() && request.location.is_none() {
             return Err(Error::InvalidInput {
                 message: "Location must be provided when namespace is not empty".into(),
             });
@@ -1021,12 +1022,12 @@ impl Database for ListingDatabase {
             NativeTable::open_with_params(
                 &table_uri,
                 &request.name,
-                request.namespace,
+                request.namespace_path,
                 self.store_wrapper.clone(),
                 Some(read_params),
                 self.read_consistency_interval,
                 request.namespace_client,
-                false, // server_side_query_enabled - listing database doesn't support server-side queries
+                HashSet::new(), // listing database doesn't support server-side queries
                 request.managed_versioning, // Pass through managed_versioning from request
             )
             .await?,
@@ -1038,15 +1039,15 @@ impl Database for ListingDatabase {
         &self,
         _cur_name: &str,
         _new_name: &str,
-        cur_namespace: &[String],
-        new_namespace: &[String],
+        cur_namespace_path: &[String],
+        new_namespace_path: &[String],
     ) -> Result<()> {
-        if !cur_namespace.is_empty() {
+        if !cur_namespace_path.is_empty() {
             return Err(Error::NotSupported {
                 message: "Namespace parameter is not supported for listing database.".into(),
             });
         }
-        if !new_namespace.is_empty() {
+        if !new_namespace_path.is_empty() {
             return Err(Error::NotSupported {
                 message: "Namespace parameter is not supported for listing database.".into(),
             });
@@ -1056,8 +1057,8 @@ impl Database for ListingDatabase {
         })
     }
 
-    async fn drop_table(&self, name: &str, namespace: &[String]) -> Result<()> {
-        if !namespace.is_empty() {
+    async fn drop_table(&self, name: &str, namespace_path: &[String]) -> Result<()> {
+        if !namespace_path.is_empty() {
             return Err(Error::NotSupported {
                 message: "Namespace parameter is not supported for listing database.".into(),
             });
@@ -1066,9 +1067,9 @@ impl Database for ListingDatabase {
     }
 
     #[allow(deprecated)]
-    async fn drop_all_tables(&self, namespace: &[String]) -> Result<()> {
+    async fn drop_all_tables(&self, namespace_path: &[String]) -> Result<()> {
         // Check if namespace parameter is provided
-        if !namespace.is_empty() {
+        if !namespace_path.is_empty() {
             return Err(Error::NotSupported {
                 message: "Namespace parameter is not supported for listing database.".into(),
             });
@@ -1146,7 +1147,7 @@ mod tests {
         let source_table = db
             .create_table(CreateTableRequest {
                 name: "source_table".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(RecordBatch::new_empty(schema.clone())) as Box<dyn Scannable>,
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1163,7 +1164,7 @@ mod tests {
         let cloned_table = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned_table".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri: source_uri.clone(),
                 source_version: None,
                 source_tag: None,
@@ -1208,7 +1209,7 @@ mod tests {
         let source_table = db
             .create_table(CreateTableRequest {
                 name: "source_with_data".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch) as Box<dyn Scannable>,
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1224,7 +1225,7 @@ mod tests {
         let cloned_table = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned_with_data".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1268,7 +1269,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "source".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema)) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),
@@ -1284,7 +1285,7 @@ mod tests {
         let cloned = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1305,7 +1306,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "source".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema)) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),
@@ -1321,7 +1322,7 @@ mod tests {
         let result = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1346,7 +1347,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "source".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema)) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),
@@ -1362,7 +1363,7 @@ mod tests {
         let result = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned".to_string(),
-                target_namespace: vec!["namespace".to_string()], // Non-empty namespace
+                target_namespace_path: vec!["namespace".to_string()], // Non-empty namespace
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1387,7 +1388,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "source".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema)) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),
@@ -1403,7 +1404,7 @@ mod tests {
         let result = db
             .clone_table(CloneTableRequest {
                 target_table_name: "invalid/name".to_string(), // Invalid name with slash
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1423,7 +1424,7 @@ mod tests {
         let result = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri: "/nonexistent/table.lance".to_string(),
                 source_version: None,
                 source_tag: None,
@@ -1444,7 +1445,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "source".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema)) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),
@@ -1460,7 +1461,7 @@ mod tests {
         let result = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: Some(1),
                 source_tag: Some("v1.0".to_string()),
@@ -1498,7 +1499,7 @@ mod tests {
         let source_table = db
             .create_table(CreateTableRequest {
                 name: "versioned_source".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch1) as Box<dyn Scannable>,
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1534,7 +1535,7 @@ mod tests {
         let cloned_table = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned_from_version".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: Some(initial_version),
                 source_tag: None,
@@ -1573,7 +1574,7 @@ mod tests {
         let source_table = db
             .create_table(CreateTableRequest {
                 name: "tagged_source".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch1),
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1613,7 +1614,7 @@ mod tests {
         let cloned_table = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned_from_tag".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: Some("v1.0".to_string()),
@@ -1649,7 +1650,7 @@ mod tests {
         let source_table = db
             .create_table(CreateTableRequest {
                 name: "independent_source".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch1),
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1665,7 +1666,7 @@ mod tests {
         let cloned_table = db
             .clone_table(CloneTableRequest {
                 target_table_name: "independent_clone".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1725,7 +1726,7 @@ mod tests {
         let source_table = db
             .create_table(CreateTableRequest {
                 name: "latest_version_source".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch1),
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1758,7 +1759,7 @@ mod tests {
         let cloned_table = db
             .clone_table(CloneTableRequest {
                 target_table_name: "cloned_latest".to_string(),
-                target_namespace: vec![],
+                target_namespace_path: vec![],
                 source_uri,
                 source_version: None,
                 source_tag: None,
@@ -1812,7 +1813,7 @@ mod tests {
         let table = db
             .create_table(CreateTableRequest {
                 name: "test_stable".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch),
                 mode: CreateTableMode::Create,
                 write_options: Default::default(),
@@ -1863,7 +1864,7 @@ mod tests {
         let table = db
             .create_table(CreateTableRequest {
                 name: "test_stable_table_level".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch),
                 mode: CreateTableMode::Create,
                 write_options,
@@ -1934,7 +1935,7 @@ mod tests {
         let table = db
             .create_table(CreateTableRequest {
                 name: "test_override".to_string(),
-                namespace: vec![],
+                namespace_path: vec![],
                 data: Box::new(batch),
                 mode: CreateTableMode::Create,
                 write_options,
@@ -2052,7 +2053,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "table1".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema.clone())) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),
@@ -2064,7 +2065,7 @@ mod tests {
 
         db.create_table(CreateTableRequest {
             name: "table2".to_string(),
-            namespace: vec![],
+            namespace_path: vec![],
             data: Box::new(RecordBatch::new_empty(schema)) as Box<dyn Scannable>,
             mode: CreateTableMode::Create,
             write_options: Default::default(),

rust/lancedb/src/database/namespace.rs

@@ -3,7 +3,7 @@
 
 //! Namespace-based database implementation that delegates table management to lance-namespace
 
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
 
 use async_trait::async_trait;
@@ -22,6 +22,7 @@ use lance_namespace_impls::ConnectBuilder;
 use lance_table::io::commit::CommitHandler;
 use lance_table::io::commit::external_manifest::ExternalManifestCommitHandler;
 
+use crate::connection::PushdownOperation;
 use crate::database::ReadConsistency;
 use crate::error::{Error, Result};
 use crate::table::NativeTable;
@@ -42,8 +43,8 @@ pub struct LanceNamespaceDatabase {
     session: Option<Arc<lance::session::Session>>,
     // database URI
     uri: String,
-    // Whether to enable server-side query execution
-    server_side_query_enabled: bool,
+    // Operations to push down to the namespace server
+    pushdown_operations: HashSet<PushdownOperation>,
 }
 
 impl LanceNamespaceDatabase {
@@ -53,7 +54,7 @@ impl LanceNamespaceDatabase {
         storage_options: HashMap<String, String>,
         read_consistency_interval: Option<std::time::Duration>,
         session: Option<Arc<lance::session::Session>>,
-        server_side_query_enabled: bool,
+        pushdown_operations: HashSet<PushdownOperation>,
     ) -> Result<Self> {
         let mut builder = ConnectBuilder::new(ns_impl);
         for (key, value) in ns_properties.clone() {
@@ -72,7 +73,7 @@ impl LanceNamespaceDatabase {
             read_consistency_interval,
             session,
             uri: format!("namespace://{}", ns_impl),
-            server_side_query_enabled,
+            pushdown_operations,
         })
     }
 }
@@ -82,7 +83,7 @@ impl std::fmt::Debug for LanceNamespaceDatabase {
         f.debug_struct("LanceNamespaceDatabase")
             .field("storage_options", &self.storage_options)
             .field("read_consistency_interval", &self.read_consistency_interval)
-            .field("server_side_query_enabled", &self.server_side_query_enabled)
+            .field("pushdown_operations", &self.pushdown_operations)
             .finish()
     }
 }
@@ -138,7 +139,7 @@ impl Database for LanceNamespaceDatabase {
 
     async fn table_names(&self, request: TableNamesRequest) -> Result<Vec<String>> {
         let ns_request = ListTablesRequest {
-            id: Some(request.namespace),
+            id: Some(request.namespace_path),
             page_token: request.start_after,
             limit: request.limit.map(|l| l as i32),
             ..Default::default()
@@ -154,7 +155,7 @@ impl Database for LanceNamespaceDatabase {
     }
 
     async fn create_table(&self, request: DbCreateTableRequest) -> Result<Arc<dyn BaseTable>> {
-        let mut table_id = request.namespace.clone();
+        let mut table_id = request.namespace_path.clone();
         table_id.push(request.name.clone());
         let describe_request = DescribeTableRequest {
             id: Some(table_id.clone()),
@@ -191,11 +192,11 @@ impl Database for LanceNamespaceDatabase {
                     let native_table = NativeTable::open_from_namespace(
                         self.namespace.clone(),
                         &request.name,
-                        request.namespace.clone(),
+                        request.namespace_path.clone(),
                         None,
                         None,
                         self.read_consistency_interval,
-                        self.server_side_query_enabled,
+                        self.pushdown_operations.clone(),
                         self.session.clone(),
                     )
                     .await?;
@@ -205,7 +206,7 @@ impl Database for LanceNamespaceDatabase {
             }
         }
 
-        let mut table_id = request.namespace.clone();
+        let mut table_id = request.namespace_path.clone();
         table_id.push(request.name.clone());
 
         let declare_request = DeclareTableRequest {
@@ -255,12 +256,12 @@ impl Database for LanceNamespaceDatabase {
             self.namespace.clone(),
             &location,
             &request.name,
-            request.namespace.clone(),
+            request.namespace_path.clone(),
             request.data,
             None, // write_store_wrapper not used for namespace connections
             write_params,
             self.read_consistency_interval,
-            self.server_side_query_enabled,
+            self.pushdown_operations.clone(),
             self.session.clone(),
         )
         .await?;
@@ -272,11 +273,11 @@ impl Database for LanceNamespaceDatabase {
         let native_table = NativeTable::open_from_namespace(
             self.namespace.clone(),
             &request.name,
-            request.namespace.clone(),
+            request.namespace_path.clone(),
             None, // write_store_wrapper not used for namespace connections
             request.lance_read_params,
             self.read_consistency_interval,
-            self.server_side_query_enabled,
+            self.pushdown_operations.clone(),
             self.session.clone(),
         )
         .await?;
@@ -294,16 +295,16 @@ impl Database for LanceNamespaceDatabase {
         &self,
         _cur_name: &str,
         _new_name: &str,
-        _cur_namespace: &[String],
-        _new_namespace: &[String],
+        _cur_namespace_path: &[String],
+        _new_namespace_path: &[String],
     ) -> Result<()> {
         Err(Error::NotSupported {
             message: "rename_table is not supported for namespace connections".to_string(),
         })
     }
 
-    async fn drop_table(&self, name: &str, namespace: &[String]) -> Result<()> {
-        let mut table_id = namespace.to_vec();
+    async fn drop_table(&self, name: &str, namespace_path: &[String]) -> Result<()> {
+        let mut table_id = namespace_path.to_vec();
         table_id.push(name.to_string());
 
         let drop_request = DropTableRequest {
@@ -321,17 +322,17 @@ impl Database for LanceNamespaceDatabase {
     }
 
     #[allow(deprecated)]
-    async fn drop_all_tables(&self, namespace: &[String]) -> Result<()> {
+    async fn drop_all_tables(&self, namespace_path: &[String]) -> Result<()> {
         let tables = self
             .table_names(TableNamesRequest {
-                namespace: namespace.to_vec(),
+                namespace_path: namespace_path.to_vec(),
                 start_after: None,
                 limit: None,
             })
             .await?;
 
         for table in tables {
-            self.drop_table(&table, namespace).await?;
+            self.drop_table(&table, namespace_path).await?;
         }
 
         Ok(())

rust/lancedb/src/dataloader/permutation/shuffle.rs

@@ -240,7 +240,7 @@ impl Shuffler {
                     .await?;
                     // Need to read the entire file in a single batch for in-memory shuffling
                     let batch = reader.read_record_batch(0, reader.num_rows()).await?;
-                    let mut rng = rng.lock().unwrap();
+                    let mut rng = rng.lock().unwrap_or_else(|e| e.into_inner());
                     Self::shuffle_batch(&batch, &mut rng, clump_size)
                 }
             })

rust/lancedb/src/expr.rs

@@ -27,7 +27,17 @@ use arrow_schema::DataType;
 use datafusion_expr::{Expr, ScalarUDF, expr_fn::cast};
 use datafusion_functions::string::expr_fn as string_expr_fn;
 
-pub use datafusion_expr::{col, lit};
+pub use datafusion_expr::lit;
+
+/// Create a column reference expression, preserving the name exactly as given.
+///
+/// Unlike DataFusion's built-in [`col`][datafusion_expr::col], this function
+/// does **not** normalise the identifier to lower-case, so
+/// `col("firstName")` correctly references a field named `firstName`.
+pub fn col(name: impl Into<String>) -> DfExpr {
+    use datafusion_common::Column;
+    DfExpr::Column(Column::new_unqualified(name))
+}
 
 pub use datafusion_expr::Expr as DfExpr;
 

rust/lancedb/src/expr/sql.rs

@@ -2,11 +2,37 @@
 // SPDX-FileCopyrightText: Copyright The LanceDB Authors
 
 use datafusion_expr::Expr;
-use datafusion_sql::unparser;
+use datafusion_sql::unparser::{self, dialect::Dialect};
+
+/// Unparser dialect that matches the quoting style expected by the Lance SQL
+/// parser.  Lance uses backtick (`` ` ``) as the only delimited-identifier
+/// quote character, so we must produce `` `firstName` `` rather than
+/// `"firstName"` for identifiers that require quoting.
+///
+/// We quote an identifier when it:
+/// * is a SQL reserved word, OR
+/// * contains characters outside `[a-zA-Z0-9_]`, OR
+/// * starts with a digit, OR
+/// * contains upper-case letters (unquoted identifiers are normalised to
+///   lower-case by the SQL parser, which would break case-sensitive schemas).
+struct LanceSqlDialect;
+
+impl Dialect for LanceSqlDialect {
+    fn identifier_quote_style(&self, identifier: &str) -> Option<char> {
+        let needs_quote = identifier.chars().any(|c| c.is_ascii_uppercase())
+            || !identifier
+                .chars()
+                .enumerate()
+                .all(|(i, c)| c == '_' || c.is_ascii_alphabetic() || (i > 0 && c.is_ascii_digit()));
+        if needs_quote { Some('`') } else { None }
+    }
+}
 
 pub fn expr_to_sql_string(expr: &Expr) -> crate::Result<String> {
-    let ast = unparser::expr_to_sql(expr).map_err(|e| crate::Error::InvalidInput {
-        message: format!("failed to serialize expression to SQL: {}", e),
-    })?;
+    let ast = unparser::Unparser::new(&LanceSqlDialect)
+        .expr_to_sql(expr)
+        .map_err(|e| crate::Error::InvalidInput {
+            message: format!("failed to serialize expression to SQL: {}", e),
+        })?;
     Ok(ast.to_string())
 }

rust/lancedb/src/io/object_store/io_tracking.rs

@@ -66,13 +66,13 @@ impl IoTrackingStore {
     }
 
     fn record_read(&self, num_bytes: u64) {
-        let mut stats = self.stats.lock().unwrap();
+        let mut stats = self.stats.lock().unwrap_or_else(|e| e.into_inner());
         stats.read_iops += 1;
         stats.read_bytes += num_bytes;
     }
 
     fn record_write(&self, num_bytes: u64) {
-        let mut stats = self.stats.lock().unwrap();
+        let mut stats = self.stats.lock().unwrap_or_else(|e| e.into_inner());
         stats.write_iops += 1;
         stats.write_bytes += num_bytes;
     }
@@ -229,10 +229,63 @@ impl MultipartUpload for IoTrackingMultipartUpload {
 
     fn put_part(&mut self, payload: PutPayload) -> UploadPart {
         {
-            let mut stats = self.stats.lock().unwrap();
+            let mut stats = self.stats.lock().unwrap_or_else(|e| e.into_inner());
             stats.write_iops += 1;
             stats.write_bytes += payload.content_length() as u64;
         }
         self.target.put_part(payload)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Helper: poison a Mutex<IoStats> by panicking while holding the lock.
+    fn poison_stats(stats: &Arc<Mutex<IoStats>>) {
+        let stats_clone = stats.clone();
+        let handle = std::thread::spawn(move || {
+            let _guard = stats_clone.lock().unwrap();
+            panic!("intentional panic to poison stats mutex");
+        });
+        let _ = handle.join();
+        assert!(stats.lock().is_err(), "mutex should be poisoned");
+    }
+
+    #[test]
+    fn test_record_read_recovers_from_poisoned_lock() {
+        let stats = Arc::new(Mutex::new(IoStats::default()));
+        let store = IoTrackingStore {
+            target: Arc::new(object_store::memory::InMemory::new()),
+            stats: stats.clone(),
+        };
+
+        poison_stats(&stats);
+
+        // record_read should not panic
+        store.record_read(1024);
+
+        // Verify the stats were updated despite poisoning
+        let s = stats.lock().unwrap_or_else(|e| e.into_inner());
+        assert_eq!(s.read_iops, 1);
+        assert_eq!(s.read_bytes, 1024);
+    }
+
+    #[test]
+    fn test_record_write_recovers_from_poisoned_lock() {
+        let stats = Arc::new(Mutex::new(IoStats::default()));
+        let store = IoTrackingStore {
+            target: Arc::new(object_store::memory::InMemory::new()),
+            stats: stats.clone(),
+        };
+
+        poison_stats(&stats);
+
+        // record_write should not panic
+        store.record_write(2048);
+
+        let s = stats.lock().unwrap_or_else(|e| e.into_inner());
+        assert_eq!(s.write_iops, 1);
+        assert_eq!(s.write_bytes, 2048);
+    }
+}

rust/lancedb/src/query.rs

@@ -5,7 +5,7 @@ use std::sync::Arc;
 use std::{future::Future, time::Duration};
 
 use arrow::compute::concat_batches;
-use arrow_array::{Array, Float16Array, Float32Array, Float64Array, make_array};
+use arrow_array::{Array, Float16Array, Float32Array, Float64Array, RecordBatch, make_array};
 use arrow_schema::{DataType, SchemaRef};
 use datafusion_expr::Expr;
 use datafusion_physical_plan::ExecutionPlan;
@@ -17,15 +17,17 @@ use lance_datafusion::exec::execute_plan;
 use lance_index::scalar::FullTextSearchQuery;
 use lance_index::scalar::inverted::SCORE_COL;
 use lance_index::vector::DIST_COL;
-use lance_io::stream::RecordBatchStreamAdapter;
 
 use crate::DistanceType;
 use crate::error::{Error, Result};
 use crate::rerankers::rrf::RRFReranker;
 use crate::rerankers::{NormalizeMethod, Reranker, check_reranker_result};
 use crate::table::BaseTable;
-use crate::utils::TimeoutStream;
-use crate::{arrow::SendableRecordBatchStream, table::AnyQuery};
+use crate::utils::{MaxBatchLengthStream, TimeoutStream};
+use crate::{
+    arrow::{SendableRecordBatchStream, SimpleRecordBatchStream},
+    table::AnyQuery,
+};
 
 mod hybrid;
 
@@ -604,6 +606,14 @@ impl Default for QueryExecutionOptions {
     }
 }
 
+impl QueryExecutionOptions {
+    fn without_output_batch_length_limit(&self) -> Self {
+        let mut options = self.clone();
+        options.max_batch_length = 0;
+        options
+    }
+}
+
 /// A trait for a query object that can be executed to get results
 ///
 /// There are various kinds of queries but they all return results
@@ -1180,6 +1190,8 @@ impl VectorQuery {
         &self,
         options: QueryExecutionOptions,
     ) -> Result<SendableRecordBatchStream> {
+        let max_batch_length = options.max_batch_length as usize;
+        let internal_options = options.without_output_batch_length_limit();
         // clone query and specify we want to include row IDs, which can be needed for reranking
         let mut fts_query = Query::new(self.parent.clone());
         fts_query.request = self.request.base.clone();
@@ -1189,8 +1201,8 @@ impl VectorQuery {
 
         vector_query.request.base.full_text_search = None;
         let (fts_results, vec_results) = try_join!(
-            fts_query.execute_with_options(options.clone()),
-            vector_query.inner_execute_with_options(options)
+            fts_query.execute_with_options(internal_options.clone()),
+            vector_query.inner_execute_with_options(internal_options)
         )?;
 
         let (fts_results, vec_results) = try_join!(
@@ -1245,9 +1257,7 @@ impl VectorQuery {
             results = results.drop_column(ROW_ID)?;
         }
 
-        Ok(SendableRecordBatchStream::from(
-            RecordBatchStreamAdapter::new(results.schema(), stream::iter([Ok(results)])),
-        ))
+        Ok(single_batch_stream(results, max_batch_length))
     }
 
     async fn inner_execute_with_options(
@@ -1256,6 +1266,7 @@ impl VectorQuery {
     ) -> Result<SendableRecordBatchStream> {
         let plan = self.create_plan(options.clone()).await?;
         let inner = execute_plan(plan, Default::default())?;
+        let inner = MaxBatchLengthStream::new_boxed(inner, options.max_batch_length as usize);
         let inner = if let Some(timeout) = options.timeout {
             TimeoutStream::new_boxed(inner, timeout)
         } else {
@@ -1265,6 +1276,25 @@ impl VectorQuery {
     }
 }
 
+fn single_batch_stream(batch: RecordBatch, max_batch_length: usize) -> SendableRecordBatchStream {
+    let schema = batch.schema();
+    if max_batch_length == 0 || batch.num_rows() <= max_batch_length {
+        return Box::pin(SimpleRecordBatchStream::new(
+            stream::iter([Ok(batch)]),
+            schema,
+        ));
+    }
+
+    let mut batches = Vec::with_capacity(batch.num_rows().div_ceil(max_batch_length));
+    let mut offset = 0;
+    while offset < batch.num_rows() {
+        let length = (batch.num_rows() - offset).min(max_batch_length);
+        batches.push(Ok(batch.slice(offset, length)));
+        offset += length;
+    }
+    Box::pin(SimpleRecordBatchStream::new(stream::iter(batches), schema))
+}
+
 impl ExecutableQuery for VectorQuery {
     async fn create_plan(&self, options: QueryExecutionOptions) -> Result<Arc<dyn ExecutionPlan>> {
         let query = AnyQuery::VectorQuery(self.request.clone());
@@ -1753,6 +1783,50 @@ mod tests {
             .unwrap()
     }
 
+    async fn make_large_vector_table(tmp_dir: &tempfile::TempDir, rows: usize) -> Table {
+        let dataset_path = tmp_dir.path().join("large_test.lance");
+        let uri = dataset_path.to_str().unwrap();
+
+        let schema = Arc::new(ArrowSchema::new(vec![
+            ArrowField::new("id", DataType::Utf8, false),
+            ArrowField::new(
+                "vector",
+                DataType::FixedSizeList(
+                    Arc::new(ArrowField::new("item", DataType::Float32, true)),
+                    4,
+                ),
+                false,
+            ),
+        ]));
+
+        let ids = StringArray::from_iter_values((0..rows).map(|i| format!("row-{i}")));
+        let vectors = FixedSizeListArray::from_iter_primitive::<Float32Type, _, _>(
+            (0..rows).map(|i| Some(vec![Some(i as f32), Some(1.0), Some(2.0), Some(3.0)])),
+            4,
+        );
+        let batch =
+            RecordBatch::try_new(schema.clone(), vec![Arc::new(ids), Arc::new(vectors)]).unwrap();
+
+        let conn = connect(uri).execute().await.unwrap();
+        conn.create_table("my_table", vec![batch])
+            .execute()
+            .await
+            .unwrap()
+    }
+
+    async fn assert_stream_batches_at_most(
+        mut results: SendableRecordBatchStream,
+        max_batch_length: usize,
+    ) {
+        let mut saw_batch = false;
+        while let Some(batch) = results.next().await {
+            let batch = batch.unwrap();
+            saw_batch = true;
+            assert!(batch.num_rows() <= max_batch_length);
+        }
+        assert!(saw_batch);
+    }
+
     #[tokio::test]
     async fn test_execute_with_options() {
         let tmp_dir = tempdir().unwrap();
@@ -1772,6 +1846,83 @@ mod tests {
         }
     }
 
+    #[tokio::test]
+    async fn test_vector_query_execute_with_options_respects_max_batch_length() {
+        let tmp_dir = tempdir().unwrap();
+        let table = make_large_vector_table(&tmp_dir, 10_000).await;
+
+        let results = table
+            .query()
+            .nearest_to(vec![0.0, 1.0, 2.0, 3.0])
+            .unwrap()
+            .limit(10_000)
+            .execute_with_options(QueryExecutionOptions {
+                max_batch_length: 100,
+                ..Default::default()
+            })
+            .await
+            .unwrap();
+        assert_stream_batches_at_most(results, 100).await;
+    }
+
+    #[tokio::test]
+    async fn test_hybrid_query_execute_with_options_respects_max_batch_length() {
+        let tmp_dir = tempdir().unwrap();
+        let dataset_path = tmp_dir.path();
+        let conn = connect(dataset_path.to_str().unwrap())
+            .execute()
+            .await
+            .unwrap();
+
+        let dims = 2;
+        let rows = 512;
+        let schema = Arc::new(ArrowSchema::new(vec![
+            ArrowField::new("text", DataType::Utf8, false),
+            ArrowField::new(
+                "vector",
+                DataType::FixedSizeList(
+                    Arc::new(ArrowField::new("item", DataType::Float32, true)),
+                    dims,
+                ),
+                false,
+            ),
+        ]));
+
+        let text = StringArray::from_iter_values((0..rows).map(|_| "match"));
+        let vectors = FixedSizeListArray::from_iter_primitive::<Float32Type, _, _>(
+            (0..rows).map(|i| Some(vec![Some(i as f32), Some(0.0)])),
+            dims,
+        );
+        let record_batch =
+            RecordBatch::try_new(schema.clone(), vec![Arc::new(text), Arc::new(vectors)]).unwrap();
+        let table = conn
+            .create_table("my_table", record_batch)
+            .execute()
+            .await
+            .unwrap();
+
+        table
+            .create_index(&["text"], crate::index::Index::FTS(Default::default()))
+            .replace(true)
+            .execute()
+            .await
+            .unwrap();
+
+        let results = table
+            .query()
+            .full_text_search(FullTextSearchQuery::new("match".to_string()))
+            .limit(rows)
+            .nearest_to(&[0.0, 0.0])
+            .unwrap()
+            .execute_with_options(QueryExecutionOptions {
+                max_batch_length: 100,
+                ..Default::default()
+            })
+            .await
+            .unwrap();
+        assert_stream_batches_at_most(results, 100).await;
+    }
+
     #[tokio::test]
     async fn test_analyze_plan() {
         let tmp_dir = tempdir().unwrap();

rust/lancedb/src/remote/db.rs

@@ -362,9 +362,9 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
     }
 
     async fn table_names(&self, request: TableNamesRequest) -> Result<Vec<String>> {
-        let mut req = if !request.namespace.is_empty() {
+        let mut req = if !request.namespace_path.is_empty() {
             let namespace_id =
-                build_namespace_identifier(&request.namespace, &self.client.id_delimiter);
+                build_namespace_identifier(&request.namespace_path, &self.client.id_delimiter);
             self.client
                 .get(&format!("/v1/namespace/{}/table/list", namespace_id))
         } else {
@@ -387,12 +387,12 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
             .tables;
         for table in &tables {
             let table_identifier =
-                build_table_identifier(table, &request.namespace, &self.client.id_delimiter);
-            let cache_key = build_cache_key(table, &request.namespace);
+                build_table_identifier(table, &request.namespace_path, &self.client.id_delimiter);
+            let cache_key = build_cache_key(table, &request.namespace_path);
             let remote_table = Arc::new(RemoteTable::new(
                 self.client.clone(),
                 table.clone(),
-                request.namespace.clone(),
+                request.namespace_path.clone(),
                 table_identifier.clone(),
                 version.clone(),
             ));
@@ -442,8 +442,11 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
     async fn create_table(&self, mut request: CreateTableRequest) -> Result<Arc<dyn BaseTable>> {
         let body = stream_as_body(request.data.scan_as_stream())?;
 
-        let identifier =
-            build_table_identifier(&request.name, &request.namespace, &self.client.id_delimiter);
+        let identifier = build_table_identifier(
+            &request.name,
+            &request.namespace_path,
+            &self.client.id_delimiter,
+        );
         let req = self
             .client
             .post(&format!("/v1/table/{}/create/", identifier))
@@ -463,7 +466,7 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
                     CreateTableMode::ExistOk(callback) => {
                         let req = OpenTableRequest {
                             name: request.name.clone(),
-                            namespace: request.namespace.clone(),
+                            namespace_path: request.namespace_path.clone(),
                             index_cache_size: None,
                             lance_read_params: None,
                             location: None,
@@ -495,13 +498,16 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
         }
         let rsp = self.client.check_response(&request_id, rsp).await?;
         let version = parse_server_version(&request_id, &rsp)?;
-        let table_identifier =
-            build_table_identifier(&request.name, &request.namespace, &self.client.id_delimiter);
-        let cache_key = build_cache_key(&request.name, &request.namespace);
+        let table_identifier = build_table_identifier(
+            &request.name,
+            &request.namespace_path,
+            &self.client.id_delimiter,
+        );
+        let cache_key = build_cache_key(&request.name, &request.namespace_path);
         let table = Arc::new(RemoteTable::new(
             self.client.clone(),
             request.name.clone(),
-            request.namespace.clone(),
+            request.namespace_path.clone(),
             table_identifier,
             version,
         ));
@@ -513,7 +519,7 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
     async fn clone_table(&self, request: CloneTableRequest) -> Result<Arc<dyn BaseTable>> {
         let table_identifier = build_table_identifier(
             &request.target_table_name,
-            &request.target_namespace,
+            &request.target_namespace_path,
             &self.client.id_delimiter,
         );
 
@@ -542,11 +548,11 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
         }
 
         let version = parse_server_version(&request_id, &rsp)?;
-        let cache_key = build_cache_key(&request.target_table_name, &request.target_namespace);
+        let cache_key = build_cache_key(&request.target_table_name, &request.target_namespace_path);
         let table = Arc::new(RemoteTable::new(
             self.client.clone(),
             request.target_table_name.clone(),
-            request.target_namespace.clone(),
+            request.target_namespace_path.clone(),
             table_identifier,
             version,
         ));
@@ -556,9 +562,12 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
     }
 
     async fn open_table(&self, request: OpenTableRequest) -> Result<Arc<dyn BaseTable>> {
-        let identifier =
-            build_table_identifier(&request.name, &request.namespace, &self.client.id_delimiter);
-        let cache_key = build_cache_key(&request.name, &request.namespace);
+        let identifier = build_table_identifier(
+            &request.name,
+            &request.namespace_path,
+            &self.client.id_delimiter,
+        );
+        let cache_key = build_cache_key(&request.name, &request.namespace_path);
 
         // We describe the table to confirm it exists before moving on.
         if let Some(table) = self.table_cache.get(&cache_key).await {
@@ -574,17 +583,17 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
             let version = parse_server_version(&request_id, &rsp)?;
             let table_identifier = build_table_identifier(
                 &request.name,
-                &request.namespace,
+                &request.namespace_path,
                 &self.client.id_delimiter,
             );
             let table = Arc::new(RemoteTable::new(
                 self.client.clone(),
                 request.name.clone(),
-                request.namespace.clone(),
+                request.namespace_path.clone(),
                 table_identifier,
                 version,
             ));
-            let cache_key = build_cache_key(&request.name, &request.namespace);
+            let cache_key = build_cache_key(&request.name, &request.namespace_path);
             self.table_cache.insert(cache_key, table.clone()).await;
             Ok(table)
         }
@@ -594,18 +603,18 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
         &self,
         current_name: &str,
         new_name: &str,
-        cur_namespace: &[String],
-        new_namespace: &[String],
+        cur_namespace_path: &[String],
+        new_namespace_path: &[String],
     ) -> Result<()> {
         let current_identifier =
-            build_table_identifier(current_name, cur_namespace, &self.client.id_delimiter);
-        let current_cache_key = build_cache_key(current_name, cur_namespace);
-        let new_cache_key = build_cache_key(new_name, new_namespace);
+            build_table_identifier(current_name, cur_namespace_path, &self.client.id_delimiter);
+        let current_cache_key = build_cache_key(current_name, cur_namespace_path);
+        let new_cache_key = build_cache_key(new_name, new_namespace_path);
 
         let mut body = serde_json::json!({ "new_table_name": new_name });
-        if !new_namespace.is_empty() {
+        if !new_namespace_path.is_empty() {
             body["new_namespace"] = serde_json::Value::Array(
-                new_namespace
+                new_namespace_path
                     .iter()
                     .map(|s| serde_json::Value::String(s.clone()))
                     .collect(),
@@ -624,9 +633,9 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
         Ok(())
     }
 
-    async fn drop_table(&self, name: &str, namespace: &[String]) -> Result<()> {
-        let identifier = build_table_identifier(name, namespace, &self.client.id_delimiter);
-        let cache_key = build_cache_key(name, namespace);
+    async fn drop_table(&self, name: &str, namespace_path: &[String]) -> Result<()> {
+        let identifier = build_table_identifier(name, namespace_path, &self.client.id_delimiter);
+        let cache_key = build_cache_key(name, namespace_path);
         let req = self.client.post(&format!("/v1/table/{}/drop/", identifier));
         let (request_id, resp) = self.client.send(req).await?;
         self.client.check_response(&request_id, resp).await?;
@@ -634,9 +643,9 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
         Ok(())
     }
 
-    async fn drop_all_tables(&self, namespace: &[String]) -> Result<()> {
+    async fn drop_all_tables(&self, namespace_path: &[String]) -> Result<()> {
         // TODO: Implement namespace-aware drop_all_tables
-        let _namespace = namespace; // Suppress unused warning for now
+        let _namespace_path = namespace_path; // Suppress unused warning for now
         Err(crate::Error::NotSupported {
             message: "Dropping all tables is not currently supported in the remote API".to_string(),
         })

rust/lancedb/src/remote/table/insert.rs

@@ -130,7 +130,10 @@ impl<S: HttpSend + 'static> RemoteInsertExec<S> {
     // TODO: this will be used when we wire this up to Table::add().
     #[allow(dead_code)]
     pub fn add_result(&self) -> Option<AddResult> {
-        self.add_result.lock().unwrap().clone()
+        self.add_result
+            .lock()
+            .unwrap_or_else(|e| e.into_inner())
+            .clone()
     }
 
     /// Stream the input into an HTTP body as an Arrow IPC stream, capturing any

rust/lancedb/src/table.rs

@@ -19,11 +19,11 @@ pub use lance::dataset::Version;
 use lance::dataset::WriteMode;
 use lance::dataset::builder::DatasetBuilder;
 use lance::dataset::{InsertBuilder, WriteParams};
+use lance::index::DatasetIndexExt;
 use lance::index::vector::VectorIndexParams;
 use lance::index::vector::utils::infer_vector_dim;
 use lance::io::{ObjectStoreParams, WrappingObjectStore};
 use lance_datafusion::utils::StreamingWriteSource;
-use lance_index::DatasetIndexExt;
 use lance_index::IndexType;
 use lance_index::scalar::{BuiltinIndexType, ScalarIndexParams};
 use lance_index::vector::bq::RQBuildParams;
@@ -42,11 +42,13 @@ use lance_table::io::commit::CommitHandler;
 use lance_table::io::commit::ManifestNamingScheme;
 use lance_table::io::commit::external_manifest::ExternalManifestCommitHandler;
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::format;
 use std::path::Path;
 use std::sync::Arc;
 
+use crate::connection::PushdownOperation;
+
 use crate::data::scannable::{PeekedScannable, Scannable, estimate_write_partitions};
 use crate::database::Database;
 use crate::embeddings::{EmbeddingDefinition, EmbeddingRegistry, MemoryRegistry};
@@ -1268,10 +1270,9 @@ pub struct NativeTable {
     // Optional namespace client for namespace operations (e.g., managed versioning).
     // pub(crate) so query.rs can access the field for server-side query execution.
     pub(crate) namespace_client: Option<Arc<dyn LanceNamespace>>,
-    // Whether to enable server-side query execution via the namespace client.
-    // When true and namespace_client is set, queries will be executed on the
-    // namespace server instead of locally.
-    pub(crate) server_side_query_enabled: bool,
+    // Operations to push down to the namespace server.
+    // pub(crate) so query.rs can access the field for server-side query execution.
+    pub(crate) pushdown_operations: HashSet<PushdownOperation>,
 }
 
 impl std::fmt::Debug for NativeTable {
@@ -1283,7 +1284,7 @@ impl std::fmt::Debug for NativeTable {
             .field("uri", &self.uri)
             .field("read_consistency_interval", &self.read_consistency_interval)
             .field("namespace_client", &self.namespace_client)
-            .field("server_side_query_enabled", &self.server_side_query_enabled)
+            .field("pushdown_operations", &self.pushdown_operations)
             .finish()
     }
 }
@@ -1320,7 +1321,18 @@ impl NativeTable {
     /// * A [NativeTable] object.
     pub async fn open(uri: &str) -> Result<Self> {
         let name = Self::get_table_name(uri)?;
-        Self::open_with_params(uri, &name, vec![], None, None, None, None, false, None).await
+        Self::open_with_params(
+            uri,
+            &name,
+            vec![],
+            None,
+            None,
+            None,
+            None,
+            HashSet::new(),
+            None,
+        )
+        .await
     }
 
     /// Opens an existing Table
@@ -1331,7 +1343,7 @@ impl NativeTable {
     /// * `name` The Table name
     /// * `params` The [ReadParams] to use when opening the table
     /// * `namespace_client` - Optional namespace client for namespace operations
-    /// * `server_side_query_enabled` - Whether to enable server-side query execution
+    /// * `pushdown_operations` - Operations to push down to the namespace server
     /// * `managed_versioning` - Whether managed versioning is enabled. If None and namespace_client
     ///   is provided, the value will be fetched via describe_table.
     ///
@@ -1347,7 +1359,7 @@ impl NativeTable {
         params: Option<ReadParams>,
         read_consistency_interval: Option<std::time::Duration>,
         namespace_client: Option<Arc<dyn LanceNamespace>>,
-        server_side_query_enabled: bool,
+        pushdown_operations: HashSet<PushdownOperation>,
         managed_versioning: Option<bool>,
     ) -> Result<Self> {
         let params = params.unwrap_or_default();
@@ -1417,7 +1429,7 @@ impl NativeTable {
             dataset,
             read_consistency_interval,
             namespace_client,
-            server_side_query_enabled,
+            pushdown_operations,
         })
     }
 
@@ -1443,10 +1455,8 @@ impl NativeTable {
     /// * `write_store_wrapper` - Optional wrapper for the object store on write path
     /// * `params` - Optional read parameters
     /// * `read_consistency_interval` - Optional interval for read consistency
-    /// * `server_side_query_enabled` - Whether to enable server-side query execution.
-    ///   When true, the namespace_client will be stored and queries will be executed
-    ///   on the namespace server. When false, the namespace is only used for opening
-    ///   the table, and queries are executed locally.
+    /// * `pushdown_operations` - Operations to push down to the namespace server.
+    ///   When `QueryTable` is included, queries will be executed on the namespace server.
     /// * `session` - Optional session for object stores and caching
     ///
     /// # Returns
@@ -1460,7 +1470,7 @@ impl NativeTable {
         write_store_wrapper: Option<Arc<dyn WrappingObjectStore>>,
         params: Option<ReadParams>,
         read_consistency_interval: Option<std::time::Duration>,
-        server_side_query_enabled: bool,
+        pushdown_operations: HashSet<PushdownOperation>,
         session: Option<Arc<lance::session::Session>>,
     ) -> Result<Self> {
         let mut params = params.unwrap_or_default();
@@ -1507,11 +1517,12 @@ impl NativeTable {
         let dataset = DatasetConsistencyWrapper::new_latest(dataset, read_consistency_interval);
         let id = Self::build_id(&namespace, name);
 
-        let stored_namespace_client = if server_side_query_enabled {
-            Some(namespace_client)
-        } else {
-            None
-        };
+        let stored_namespace_client =
+            if pushdown_operations.contains(&PushdownOperation::QueryTable) {
+                Some(namespace_client)
+            } else {
+                None
+            };
 
         Ok(Self {
             name: name.to_string(),
@@ -1521,7 +1532,7 @@ impl NativeTable {
             dataset,
             read_consistency_interval,
             namespace_client: stored_namespace_client,
-            server_side_query_enabled,
+            pushdown_operations,
         })
     }
 
@@ -1562,7 +1573,7 @@ impl NativeTable {
     /// * `batches` RecordBatch to be saved in the database.
     /// * `params` - Write parameters.
     /// * `namespace_client` - Optional namespace client for namespace operations
-    /// * `server_side_query_enabled` - Whether to enable server-side query execution
+    /// * `pushdown_operations` - Operations to push down to the namespace server
     ///
     /// # Returns
     ///
@@ -1577,7 +1588,7 @@ impl NativeTable {
         params: Option<WriteParams>,
         read_consistency_interval: Option<std::time::Duration>,
         namespace_client: Option<Arc<dyn LanceNamespace>>,
-        server_side_query_enabled: bool,
+        pushdown_operations: HashSet<PushdownOperation>,
     ) -> Result<Self> {
         // Default params uses format v1.
         let params = params.unwrap_or(WriteParams {
@@ -1610,7 +1621,7 @@ impl NativeTable {
             dataset: DatasetConsistencyWrapper::new_latest(dataset, read_consistency_interval),
             read_consistency_interval,
             namespace_client,
-            server_side_query_enabled,
+            pushdown_operations,
         })
     }
 
@@ -1624,7 +1635,7 @@ impl NativeTable {
         params: Option<WriteParams>,
         read_consistency_interval: Option<std::time::Duration>,
         namespace_client: Option<Arc<dyn LanceNamespace>>,
-        server_side_query_enabled: bool,
+        pushdown_operations: HashSet<PushdownOperation>,
     ) -> Result<Self> {
         let data: Box<dyn Scannable> = Box::new(RecordBatch::new_empty(schema));
         Self::create(
@@ -1636,7 +1647,7 @@ impl NativeTable {
             params,
             read_consistency_interval,
             namespace_client,
-            server_side_query_enabled,
+            pushdown_operations,
         )
         .await
     }
@@ -1659,7 +1670,7 @@ impl NativeTable {
     /// * `write_store_wrapper` - Optional wrapper for the object store on write path
     /// * `params` - Optional write parameters
     /// * `read_consistency_interval` - Optional interval for read consistency
-    /// * `server_side_query_enabled` - Whether to enable server-side query execution
+    /// * `pushdown_operations` - Operations to push down to the namespace server
     ///
     /// # Returns
     ///
@@ -1674,7 +1685,7 @@ impl NativeTable {
         write_store_wrapper: Option<Arc<dyn WrappingObjectStore>>,
         params: Option<WriteParams>,
         read_consistency_interval: Option<std::time::Duration>,
-        server_side_query_enabled: bool,
+        pushdown_operations: HashSet<PushdownOperation>,
         session: Option<Arc<lance::session::Session>>,
     ) -> Result<Self> {
         // Build table_id from namespace + name for the storage options provider
@@ -1726,11 +1737,12 @@ impl NativeTable {
 
         let id = Self::build_id(&namespace, name);
 
-        let stored_namespace_client = if server_side_query_enabled {
-            Some(namespace_client)
-        } else {
-            None
-        };
+        let stored_namespace_client =
+            if pushdown_operations.contains(&PushdownOperation::QueryTable) {
+                Some(namespace_client)
+            } else {
+                None
+            };
 
         Ok(Self {
             name: name.to_string(),
@@ -1740,7 +1752,7 @@ impl NativeTable {
             dataset: DatasetConsistencyWrapper::new_latest(dataset, read_consistency_interval),
             read_consistency_interval,
             namespace_client: stored_namespace_client,
-            server_side_query_enabled,
+            pushdown_operations,
         })
     }
 
@@ -2751,9 +2763,19 @@ mod tests {
             vec![Ok(batch.clone())],
             batch.schema(),
         ));
-        let table = NativeTable::create(uri, "test", vec![], reader, None, None, None, None, false)
-            .await
-            .unwrap();
+        let table = NativeTable::create(
+            uri,
+            "test",
+            vec![],
+            reader,
+            None,
+            None,
+            None,
+            None,
+            HashSet::new(),
+        )
+        .await
+        .unwrap();
 
         assert_eq!(table.count_rows(None).await.unwrap(), 10);
         assert_eq!(
@@ -3780,7 +3802,7 @@ mod tests {
             TableStatistics {
                 num_rows: 250,
                 num_indices: 0,
-                total_bytes: 2000,
+                total_bytes: 2300,
                 fragment_stats: FragmentStatistics {
                     num_fragments: 11,
                     num_small_fragments: 11,

rust/lancedb/src/table/datafusion/insert.rs

@@ -204,7 +204,9 @@ impl ExecutionPlan for InsertExec {
 
             let to_commit = {
                 // Don't hold the lock over an await point.
-                let mut txns = partial_transactions.lock().unwrap();
+                let mut txns = partial_transactions
+                    .lock()
+                    .unwrap_or_else(|e| e.into_inner());
                 txns.push(transaction);
                 if txns.len() == total_partitions {
                     Some(std::mem::take(&mut *txns))

rust/lancedb/src/table/dataset.rs

@@ -82,7 +82,7 @@ impl DatasetConsistencyWrapper {
     /// pinned dataset regardless of consistency mode.
     pub async fn get(&self) -> Result<Arc<Dataset>> {
         {
-            let state = self.state.lock().unwrap();
+            let state = self.state.lock()?;
             if state.pinned_version.is_some() {
                 return Ok(state.dataset.clone());
             }
@@ -101,7 +101,7 @@ impl DatasetConsistencyWrapper {
             }
             ConsistencyMode::Strong => refresh_latest(self.state.clone()).await,
             ConsistencyMode::Lazy => {
-                let state = self.state.lock().unwrap();
+                let state = self.state.lock()?;
                 Ok(state.dataset.clone())
             }
         }
@@ -116,7 +116,7 @@ impl DatasetConsistencyWrapper {
     /// concurrent [`as_time_travel`](Self::as_time_travel) call), the update
     /// is silently ignored — the write already committed to storage.
     pub fn update(&self, dataset: Dataset) {
-        let mut state = self.state.lock().unwrap();
+        let mut state = self.state.lock().unwrap_or_else(|e| e.into_inner());
         if state.pinned_version.is_some() {
             // A concurrent as_time_travel() beat us here. The write succeeded
             // in storage, but since we're now pinned we don't advance the
@@ -139,7 +139,7 @@ impl DatasetConsistencyWrapper {
 
     /// Check that the dataset is in a mutable mode (Latest).
     pub fn ensure_mutable(&self) -> Result<()> {
-        let state = self.state.lock().unwrap();
+        let state = self.state.lock()?;
         if state.pinned_version.is_some() {
             Err(crate::Error::InvalidInput {
                 message: "table cannot be modified when a specific version is checked out"
@@ -152,13 +152,16 @@ impl DatasetConsistencyWrapper {
 
     /// Returns the version, if in time travel mode, or None otherwise.
     pub fn time_travel_version(&self) -> Option<u64> {
-        self.state.lock().unwrap().pinned_version
+        self.state
+            .lock()
+            .unwrap_or_else(|e| e.into_inner())
+            .pinned_version
     }
 
     /// Convert into a wrapper in latest version mode.
     pub async fn as_latest(&self) -> Result<()> {
         let dataset = {
-            let state = self.state.lock().unwrap();
+            let state = self.state.lock()?;
             if state.pinned_version.is_none() {
                 return Ok(());
             }
@@ -168,7 +171,7 @@ impl DatasetConsistencyWrapper {
         let latest_version = dataset.latest_version_id().await?;
         let new_dataset = dataset.checkout_version(latest_version).await?;
 
-        let mut state = self.state.lock().unwrap();
+        let mut state = self.state.lock()?;
         if state.pinned_version.is_some() {
             state.dataset = Arc::new(new_dataset);
             state.pinned_version = None;
@@ -184,7 +187,7 @@ impl DatasetConsistencyWrapper {
         let target_ref = target_version.into();
 
         let (should_checkout, dataset) = {
-            let state = self.state.lock().unwrap();
+            let state = self.state.lock()?;
             let should = match state.pinned_version {
                 None => true,
                 Some(version) => match &target_ref {
@@ -204,7 +207,7 @@ impl DatasetConsistencyWrapper {
         let new_dataset = dataset.checkout_version(target_ref).await?;
         let version_value = new_dataset.version().version;
 
-        let mut state = self.state.lock().unwrap();
+        let mut state = self.state.lock()?;
         state.dataset = Arc::new(new_dataset);
         state.pinned_version = Some(version_value);
         Ok(())
@@ -212,7 +215,7 @@ impl DatasetConsistencyWrapper {
 
     pub async fn reload(&self) -> Result<()> {
         let (dataset, pinned_version) = {
-            let state = self.state.lock().unwrap();
+            let state = self.state.lock()?;
             (state.dataset.clone(), state.pinned_version)
         };
 
@@ -230,7 +233,7 @@ impl DatasetConsistencyWrapper {
 
                 let new_dataset = dataset.checkout_version(version).await?;
 
-                let mut state = self.state.lock().unwrap();
+                let mut state = self.state.lock()?;
                 if state.pinned_version == Some(version) {
                     state.dataset = Arc::new(new_dataset);
                 }
@@ -242,14 +245,14 @@ impl DatasetConsistencyWrapper {
 }
 
 async fn refresh_latest(state: Arc<Mutex<DatasetState>>) -> Result<Arc<Dataset>> {
-    let dataset = { state.lock().unwrap().dataset.clone() };
+    let dataset = { state.lock()?.dataset.clone() };
 
     let mut ds = (*dataset).clone();
     ds.checkout_latest().await?;
     let new_arc = Arc::new(ds);
 
     {
-        let mut state = state.lock().unwrap();
+        let mut state = state.lock()?;
         if state.pinned_version.is_none()
             && new_arc.manifest().version >= state.dataset.manifest().version
         {
@@ -612,4 +615,108 @@ mod tests {
         let s = io_stats.incremental_stats();
         assert_eq!(s.read_iops, 0, "step 5, elapsed={:?}", start.elapsed());
     }
+
+    /// Helper: poison the mutex inside a DatasetConsistencyWrapper.
+    fn poison_state(wrapper: &DatasetConsistencyWrapper) {
+        let state = wrapper.state.clone();
+        let handle = std::thread::spawn(move || {
+            let _guard = state.lock().unwrap();
+            panic!("intentional panic to poison mutex");
+        });
+        let _ = handle.join(); // join collects the panic
+        assert!(wrapper.state.lock().is_err(), "mutex should be poisoned");
+    }
+
+    #[tokio::test]
+    async fn test_get_returns_error_on_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        // get() should return Err, not panic
+        let result = wrapper.get().await;
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn test_ensure_mutable_returns_error_on_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        let result = wrapper.ensure_mutable();
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn test_update_recovers_from_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+        let ds_v2 = append_to_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        // update() returns (), should not panic
+        wrapper.update(ds_v2);
+    }
+
+    #[tokio::test]
+    async fn test_time_travel_version_recovers_from_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        // Should not panic, returns whatever was in the mutex
+        let _version = wrapper.time_travel_version();
+    }
+
+    #[tokio::test]
+    async fn test_as_latest_returns_error_on_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        let result = wrapper.as_latest().await;
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn test_as_time_travel_returns_error_on_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        let result = wrapper.as_time_travel(1u64).await;
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn test_reload_returns_error_on_poisoned_lock() {
+        let dir = tempfile::tempdir().unwrap();
+        let uri = dir.path().to_str().unwrap();
+        let ds = create_test_dataset(uri).await;
+
+        let wrapper = DatasetConsistencyWrapper::new_latest(ds, None);
+        poison_state(&wrapper);
+
+        let result = wrapper.reload().await;
+        assert!(result.is_err());
+    }
 }

rust/lancedb/src/table/optimize.rs

@@ -10,7 +10,7 @@ use std::sync::Arc;
 
 use lance::dataset::cleanup::RemovalStats;
 use lance::dataset::optimize::{CompactionMetrics, IndexRemapperOptions, compact_files};
-use lance_index::DatasetIndexExt;
+use lance::index::DatasetIndexExt;
 use lance_index::optimize::OptimizeOptions;
 use log::info;
 

rust/lancedb/src/table/query.rs

@@ -4,12 +4,13 @@
 use std::sync::Arc;
 
 use super::NativeTable;
+use crate::connection::PushdownOperation;
 use crate::error::{Error, Result};
 use crate::expr::expr_to_sql_string;
 use crate::query::{
     DEFAULT_TOP_K, QueryExecutionOptions, QueryFilter, QueryRequest, Select, VectorQueryRequest,
 };
-use crate::utils::{TimeoutStream, default_vector_column};
+use crate::utils::{MaxBatchLengthStream, TimeoutStream, default_vector_column};
 use arrow::array::{AsArray, FixedSizeListBuilder, Float32Builder};
 use arrow::datatypes::{Float32Type, UInt8Type};
 use arrow_array::Array;
@@ -40,8 +41,10 @@ pub async fn execute_query(
     query: &AnyQuery,
     options: QueryExecutionOptions,
 ) -> Result<DatasetRecordBatchStream> {
-    // If server-side query is enabled and namespace client is configured, use server-side query execution
-    if table.server_side_query_enabled
+    // If QueryTable pushdown is enabled and namespace client is configured, use server-side query execution
+    if table
+        .pushdown_operations
+        .contains(&PushdownOperation::QueryTable)
         && let Some(ref namespace_client) = table.namespace_client
     {
         return execute_namespace_query(table, namespace_client.clone(), query, options).await;
@@ -66,6 +69,7 @@ async fn execute_generic_query(
 ) -> Result<DatasetRecordBatchStream> {
     let plan = create_plan(table, query, options.clone()).await?;
     let inner = execute_plan(plan, Default::default())?;
+    let inner = MaxBatchLengthStream::new_boxed(inner, options.max_batch_length as usize);
     let inner = if let Some(timeout) = options.timeout {
         TimeoutStream::new_boxed(inner, timeout)
     } else {
@@ -200,7 +204,9 @@ pub async fn create_plan(
         scanner.with_row_id();
     }
 
-    scanner.batch_size(options.max_batch_length as usize);
+    if options.max_batch_length > 0 {
+        scanner.batch_size(options.max_batch_length as usize);
+    }
 
     if query.base.fast_search {
         scanner.fast_search();

rust/lancedb/src/table/write_progress.rs

@@ -130,8 +130,11 @@ impl WriteProgressTracker {
     pub fn record_batch(&self, rows: usize, bytes: usize) {
         // Lock order: callback first, then rows_and_bytes. This is the only
         // order used anywhere, so deadlocks cannot occur.
-        let mut cb = self.callback.lock().unwrap();
-        let mut guard = self.rows_and_bytes.lock().unwrap();
+        let mut cb = self.callback.lock().unwrap_or_else(|e| e.into_inner());
+        let mut guard = self
+            .rows_and_bytes
+            .lock()
+            .unwrap_or_else(|e| e.into_inner());
         guard.0 += rows;
         guard.1 += bytes;
         let progress = self.snapshot(guard.0, guard.1, false);
@@ -151,8 +154,11 @@ impl WriteProgressTracker {
     /// `total_rows` is always `Some` on the final callback: it uses the known
     /// total if available, or falls back to the number of rows actually written.
     pub fn finish(&self) {
-        let mut cb = self.callback.lock().unwrap();
-        let guard = self.rows_and_bytes.lock().unwrap();
+        let mut cb = self.callback.lock().unwrap_or_else(|e| e.into_inner());
+        let guard = self
+            .rows_and_bytes
+            .lock()
+            .unwrap_or_else(|e| e.into_inner());
         let mut snap = self.snapshot(guard.0, guard.1, true);
         snap.total_rows = Some(self.total_rows.unwrap_or(guard.0));
         drop(guard);
@@ -376,4 +382,50 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    fn test_record_batch_recovers_from_poisoned_callback_lock() {
+        use super::{ProgressCallback, WriteProgressTracker};
+        use std::sync::Mutex;
+
+        let callback: ProgressCallback = Arc::new(Mutex::new(|_: &super::WriteProgress| {}));
+
+        // Poison the callback mutex
+        let cb_clone = callback.clone();
+        let handle = std::thread::spawn(move || {
+            let _guard = cb_clone.lock().unwrap();
+            panic!("intentional panic to poison callback mutex");
+        });
+        let _ = handle.join();
+        assert!(
+            callback.lock().is_err(),
+            "callback mutex should be poisoned"
+        );
+
+        let tracker = WriteProgressTracker::new(callback, Some(100));
+
+        // record_batch should not panic
+        tracker.record_batch(10, 1024);
+    }
+
+    #[test]
+    fn test_finish_recovers_from_poisoned_callback_lock() {
+        use super::{ProgressCallback, WriteProgressTracker};
+        use std::sync::Mutex;
+
+        let callback: ProgressCallback = Arc::new(Mutex::new(|_: &super::WriteProgress| {}));
+
+        // Poison the callback mutex
+        let cb_clone = callback.clone();
+        let handle = std::thread::spawn(move || {
+            let _guard = cb_clone.lock().unwrap();
+            panic!("intentional panic to poison callback mutex");
+        });
+        let _ = handle.join();
+
+        let tracker = WriteProgressTracker::new(callback, Some(100));
+
+        // finish should not panic
+        tracker.finish();
+    }
 }

rust/lancedb/src/utils/background_cache.rs

@@ -122,7 +122,7 @@ where
     /// This is a cheap synchronous check useful as a fast path before
     /// constructing a fetch closure for [`get()`](Self::get).
     pub fn try_get(&self) -> Option<V> {
-        let cache = self.inner.lock().unwrap();
+        let cache = self.inner.lock().unwrap_or_else(|e| e.into_inner());
         cache.state.fresh_value(self.ttl, self.refresh_window)
     }
 
@@ -138,7 +138,7 @@ where
     {
         // Fast path: check if cache is fresh
         {
-            let cache = self.inner.lock().unwrap();
+            let cache = self.inner.lock().unwrap_or_else(|e| e.into_inner());
             if let Some(value) = cache.state.fresh_value(self.ttl, self.refresh_window) {
                 return Ok(value);
             }
@@ -147,7 +147,7 @@ where
         // Slow path
         let mut fetch = Some(fetch);
         let action = {
-            let mut cache = self.inner.lock().unwrap();
+            let mut cache = self.inner.lock().unwrap_or_else(|e| e.into_inner());
             self.determine_action(&mut cache, &mut fetch)
         };
 
@@ -161,7 +161,7 @@ where
     ///
     /// This avoids a blocking fetch on the first [`get()`](Self::get) call.
     pub fn seed(&self, value: V) {
-        let mut cache = self.inner.lock().unwrap();
+        let mut cache = self.inner.lock().unwrap_or_else(|e| e.into_inner());
         cache.state = State::Current(value, clock::now());
     }
 
@@ -170,7 +170,7 @@ where
     /// Any in-flight background fetch from before this call will not update the
     /// cache (the generation counter prevents stale writes).
     pub fn invalidate(&self) {
-        let mut cache = self.inner.lock().unwrap();
+        let mut cache = self.inner.lock().unwrap_or_else(|e| e.into_inner());
         cache.state = State::Empty;
         cache.generation += 1;
     }
@@ -267,7 +267,7 @@ where
         let fut_for_spawn = shared.clone();
         tokio::spawn(async move {
             let result = fut_for_spawn.await;
-            let mut cache = inner.lock().unwrap();
+            let mut cache = inner.lock().unwrap_or_else(|e| e.into_inner());
             // Only update if no invalidation has happened since we started
             if cache.generation != generation {
                 return;
@@ -590,4 +590,67 @@ mod tests {
         let v = cache.get(ok_fetcher(count.clone(), "fresh")).await.unwrap();
         assert_eq!(v, "fresh");
     }
+
+    /// Helper: poison the inner mutex of a BackgroundCache.
+    fn poison_cache(cache: &BackgroundCache<String, TestError>) {
+        let inner = cache.inner.clone();
+        let handle = std::thread::spawn(move || {
+            let _guard = inner.lock().unwrap();
+            panic!("intentional panic to poison mutex");
+        });
+        let _ = handle.join();
+        assert!(cache.inner.lock().is_err(), "mutex should be poisoned");
+    }
+
+    #[tokio::test]
+    async fn test_try_get_recovers_from_poisoned_lock() {
+        let cache = new_cache();
+        let count = Arc::new(AtomicUsize::new(0));
+
+        // Seed a value first
+        cache.get(ok_fetcher(count.clone(), "hello")).await.unwrap();
+        cache.get(ok_fetcher(count.clone(), "hello")).await.unwrap(); // peek
+
+        poison_cache(&cache);
+
+        // try_get() should not panic — it recovers via unwrap_or_else
+        let result = cache.try_get();
+        // The value may or may not be fresh depending on timing, but it must not panic
+        let _ = result;
+    }
+
+    #[tokio::test]
+    async fn test_get_recovers_from_poisoned_lock() {
+        let cache = new_cache();
+        let count = Arc::new(AtomicUsize::new(0));
+
+        poison_cache(&cache);
+
+        // get() should not panic — it recovers and can still fetch
+        let result = cache.get(ok_fetcher(count.clone(), "recovered")).await;
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), "recovered");
+    }
+
+    #[tokio::test]
+    async fn test_seed_recovers_from_poisoned_lock() {
+        let cache = new_cache();
+        poison_cache(&cache);
+
+        // seed() should not panic
+        cache.seed("seeded".to_string());
+    }
+
+    #[tokio::test]
+    async fn test_invalidate_recovers_from_poisoned_lock() {
+        let cache = new_cache();
+        let count = Arc::new(AtomicUsize::new(0));
+
+        cache.get(ok_fetcher(count.clone(), "hello")).await.unwrap();
+
+        poison_cache(&cache);
+
+        // invalidate() should not panic
+        cache.invalidate();
+    }
 }

rust/lancedb/src/utils/mod.rs

@@ -335,6 +335,85 @@ impl Stream for TimeoutStream {
     }
 }
 
+/// A `Stream` wrapper that slices oversized batches to enforce a maximum batch length.
+pub struct MaxBatchLengthStream {
+    inner: SendableRecordBatchStream,
+    max_batch_length: Option<usize>,
+    buffered_batch: Option<RecordBatch>,
+    buffered_offset: usize,
+}
+
+impl MaxBatchLengthStream {
+    pub fn new(inner: SendableRecordBatchStream, max_batch_length: usize) -> Self {
+        Self {
+            inner,
+            max_batch_length: (max_batch_length > 0).then_some(max_batch_length),
+            buffered_batch: None,
+            buffered_offset: 0,
+        }
+    }
+
+    pub fn new_boxed(
+        inner: SendableRecordBatchStream,
+        max_batch_length: usize,
+    ) -> SendableRecordBatchStream {
+        if max_batch_length == 0 {
+            inner
+        } else {
+            Box::pin(Self::new(inner, max_batch_length))
+        }
+    }
+}
+
+impl RecordBatchStream for MaxBatchLengthStream {
+    fn schema(&self) -> SchemaRef {
+        self.inner.schema()
+    }
+}
+
+impl Stream for MaxBatchLengthStream {
+    type Item = DataFusionResult<RecordBatch>;
+
+    fn poll_next(
+        mut self: Pin<&mut Self>,
+        cx: &mut std::task::Context<'_>,
+    ) -> std::task::Poll<Option<Self::Item>> {
+        loop {
+            let Some(max_batch_length) = self.max_batch_length else {
+                return Pin::new(&mut self.inner).poll_next(cx);
+            };
+
+            if let Some(batch) = self.buffered_batch.clone() {
+                if self.buffered_offset < batch.num_rows() {
+                    let remaining = batch.num_rows() - self.buffered_offset;
+                    let length = remaining.min(max_batch_length);
+                    let sliced = batch.slice(self.buffered_offset, length);
+                    self.buffered_offset += length;
+                    if self.buffered_offset >= batch.num_rows() {
+                        self.buffered_batch = None;
+                        self.buffered_offset = 0;
+                    }
+                    return std::task::Poll::Ready(Some(Ok(sliced)));
+                }
+
+                self.buffered_batch = None;
+                self.buffered_offset = 0;
+            }
+
+            match Pin::new(&mut self.inner).poll_next(cx) {
+                std::task::Poll::Ready(Some(Ok(batch))) => {
+                    if batch.num_rows() <= max_batch_length {
+                        return std::task::Poll::Ready(Some(Ok(batch)));
+                    }
+                    self.buffered_batch = Some(batch);
+                    self.buffered_offset = 0;
+                }
+                other => return other,
+            }
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use arrow_array::Int32Array;
@@ -470,7 +549,7 @@ mod tests {
         assert_eq!(string_to_datatype(string), Some(expected));
     }
 
-    fn sample_batch() -> RecordBatch {
+    fn sample_batch(num_rows: i32) -> RecordBatch {
         let schema = Arc::new(Schema::new(vec![Field::new(
             "col1",
             DataType::Int32,
@@ -478,14 +557,14 @@ mod tests {
         )]));
         RecordBatch::try_new(
             schema.clone(),
-            vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
+            vec![Arc::new(Int32Array::from_iter_values(0..num_rows))],
         )
         .unwrap()
     }
 
     #[tokio::test]
     async fn test_timeout_stream() {
-        let batch = sample_batch();
+        let batch = sample_batch(3);
         let schema = batch.schema();
         let mock_stream = stream::iter(vec![Ok(batch.clone()), Ok(batch.clone())]);
 
@@ -515,7 +594,7 @@ mod tests {
 
     #[tokio::test]
     async fn test_timeout_stream_zero_duration() {
-        let batch = sample_batch();
+        let batch = sample_batch(3);
         let schema = batch.schema();
         let mock_stream = stream::iter(vec![Ok(batch.clone()), Ok(batch.clone())]);
 
@@ -534,7 +613,7 @@ mod tests {
 
     #[tokio::test]
     async fn test_timeout_stream_completes_normally() {
-        let batch = sample_batch();
+        let batch = sample_batch(3);
         let schema = batch.schema();
         let mock_stream = stream::iter(vec![Ok(batch.clone()), Ok(batch.clone())]);
 
@@ -552,4 +631,35 @@ mod tests {
         // Stream should be empty now
         assert!(timeout_stream.next().await.is_none());
     }
+
+    async fn collect_batch_sizes(
+        stream: SendableRecordBatchStream,
+        max_batch_length: usize,
+    ) -> Vec<usize> {
+        let mut sliced_stream = MaxBatchLengthStream::new(stream, max_batch_length);
+        sliced_stream
+            .by_ref()
+            .map(|batch| batch.unwrap().num_rows())
+            .collect::<Vec<_>>()
+            .await
+    }
+
+    #[tokio::test]
+    async fn test_max_batch_length_stream_behaviors() {
+        let schema = sample_batch(7).schema();
+        let mock_stream = stream::iter(vec![Ok(sample_batch(2)), Ok(sample_batch(7))]);
+
+        let sendable_stream: SendableRecordBatchStream =
+            Box::pin(RecordBatchStreamAdapter::new(schema.clone(), mock_stream));
+        assert_eq!(
+            collect_batch_sizes(sendable_stream, 3).await,
+            vec![2, 3, 3, 1]
+        );
+
+        let sendable_stream: SendableRecordBatchStream = Box::pin(RecordBatchStreamAdapter::new(
+            schema,
+            stream::iter(vec![Ok(sample_batch(2)), Ok(sample_batch(7))]),
+        ));
+        assert_eq!(collect_batch_sizes(sendable_stream, 0).await, vec![2, 7]);
+    }
 }