Bump version: 0.29.1-beta.0 → 0.29.1

Trusted publishing requires npm >=11.5.1, which means node>=24.

Also need `npm config set provenance true` to fully enable it

.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.25.0-beta.0"
+current_version = "0.26.0"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.

.github/workflows/npm-publish.yml

@@ -318,7 +318,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
           cache-dependency-path: nodejs/package-lock.json
           registry-url: "https://registry.npmjs.org"
@@ -350,6 +350,7 @@ jobs:
         env:
           DRY_RUN: ${{ !startsWith(github.ref, 'refs/tags/v') }}
         run: |
+          npm config set provenance true
           ARGS="--access public"
           if [[ $DRY_RUN == "true" ]]; then
             ARGS="$ARGS --dry-run"

Cargo.lock

@@ -4926,7 +4926,7 @@ dependencies = [
 
 [[package]]
 name = "lancedb"
-version = "0.25.0-beta.0"
+version = "0.26.0"
 dependencies = [
  "ahash",
  "anyhow",
@@ -5006,7 +5006,7 @@ dependencies = [
 
 [[package]]
 name = "lancedb-nodejs"
-version = "0.25.0-beta.0"
+version = "0.26.0"
 dependencies = [
  "arrow-array",
  "arrow-ipc",
@@ -5026,7 +5026,7 @@ dependencies = [
 
 [[package]]
 name = "lancedb-python"
-version = "0.28.0-beta.0"
+version = "0.29.0"
 dependencies = [
  "arrow",
  "async-trait",

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>0.25.0-beta.0</version>
+    <version>0.26.0</version>
 </dependency>
 ```
 

java/lancedb-core/pom.xml

@@ -8,7 +8,7 @@
     <parent>
       <groupId>com.lancedb</groupId>
       <artifactId>lancedb-parent</artifactId>
-      <version>0.25.0-beta.0</version>
+      <version>0.26.0-final.0</version>
       <relativePath>../pom.xml</relativePath>
     </parent>
 

java/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.lancedb</groupId>
     <artifactId>lancedb-parent</artifactId>
-    <version>0.25.0-beta.0</version>
+    <version>0.26.0-final.0</version>
     <packaging>pom</packaging>
     <name>${project.artifactId}</name>
     <description>LanceDB Java SDK Parent POM</description>

nodejs/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "lancedb-nodejs"
 edition.workspace = true
-version = "0.25.0-beta.0"
+version = "0.26.0"
 license.workspace = true
 description.workspace = true
 repository.workspace = true

nodejs/npm/darwin-arm64/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-darwin-arm64",
-	"version": "0.25.0-beta.0",
+	"version": "0.26.0",
 	"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": "0.25.0-beta.0",
+	"version": "0.26.0",
 	"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": "0.25.0-beta.0",
+	"version": "0.26.0",
 	"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": "0.25.0-beta.0",
+	"version": "0.26.0",
 	"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": "0.25.0-beta.0",
+	"version": "0.26.0",
 	"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": "0.25.0-beta.0",
+  "version": "0.26.0",
   "os": [
     "win32"
   ],

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

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-win32-x64-msvc",
-	"version": "0.25.0-beta.0",
+	"version": "0.26.0",
 	"os": ["win32"],
 	"cpu": ["x64"],
 	"main": "lancedb.win32-x64-msvc.node",

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@lancedb/lancedb",
-  "version": "0.25.0-beta.0",
+  "version": "0.26.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@lancedb/lancedb",
-      "version": "0.25.0-beta.0",
+      "version": "0.26.0",
       "cpu": [
         "x64",
         "arm64"

nodejs/package.json

@@ -11,7 +11,7 @@
     "ann"
   ],
   "private": false,
-  "version": "0.25.0-beta.0",
+  "version": "0.26.0",
   "main": "dist/index.js",
   "exports": {
     ".": "./dist/index.js",

python/.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.29.0"
+current_version = "0.29.1"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.

python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb-python"
-version = "0.29.0"
+version = "0.29.1"
 edition.workspace = true
 description = "Python bindings for LanceDB"
 license.workspace = true

rust/lancedb/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb"
-version = "0.25.0-beta.0"
+version = "0.26.0"
 edition.workspace = true
 description = "LanceDB: A serverless, low-latency vector database for AI applications"
 license.workspace = true

rust/lancedb/src/table.rs

@@ -79,6 +79,7 @@ pub mod datafusion;
 pub(crate) mod dataset;
 pub mod delete;
 pub mod merge;
+pub mod schema_evolution;
 pub mod update;
 
 use crate::index::waiter::wait_for_index;
@@ -91,6 +92,7 @@ pub use lance::dataset::scanner::DatasetRecordBatchStream;
 use lance::dataset::statistics::DatasetStatisticsExt;
 use lance_index::frag_reuse::FRAG_REUSE_INDEX_NAME;
 pub use lance_index::optimize::OptimizeOptions;
+pub use schema_evolution::{AddColumnsResult, AlterColumnsResult, DropColumnsResult};
 use serde_with::skip_serializing_none;
 pub use update::{UpdateBuilder, UpdateResult};
 
@@ -396,33 +398,6 @@ pub struct MergeResult {
     pub num_attempts: u32,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
-pub struct AddColumnsResult {
-    // The commit version associated with the operation.
-    // A version of `0` indicates compatibility with legacy servers that do not return
-    /// a commit version.
-    #[serde(default)]
-    pub version: u64,
-}
-
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
-pub struct AlterColumnsResult {
-    // The commit version associated with the operation.
-    // A version of `0` indicates compatibility with legacy servers that do not return
-    /// a commit version.
-    #[serde(default)]
-    pub version: u64,
-}
-
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
-pub struct DropColumnsResult {
-    // The commit version associated with the operation.
-    // A version of `0` indicates compatibility with legacy servers that do not return
-    /// a commit version.
-    #[serde(default)]
-    pub version: u64,
-}
-
 /// A trait for anything "table-like".  This is used for both native tables (which target
 /// Lance datasets) and remote tables (which target LanceDB cloud)
 ///
@@ -3091,27 +3066,15 @@ impl BaseTable for NativeTable {
         transforms: NewColumnTransform,
         read_columns: Option<Vec<String>>,
     ) -> Result<AddColumnsResult> {
-        let mut dataset = self.dataset.get_mut().await?;
+        schema_evolution::execute_add_columns(self, transforms, read_columns).await
-        dataset.add_columns(transforms, read_columns, None).await?;
-        Ok(AddColumnsResult {
-            version: dataset.version().version,
-        })
     }
 
     async fn alter_columns(&self, alterations: &[ColumnAlteration]) -> Result<AlterColumnsResult> {
-        let mut dataset = self.dataset.get_mut().await?;
+        schema_evolution::execute_alter_columns(self, alterations).await
-        dataset.alter_columns(alterations).await?;
-        Ok(AlterColumnsResult {
-            version: dataset.version().version,
-        })
     }
 
     async fn drop_columns(&self, columns: &[&str]) -> Result<DropColumnsResult> {
-        let mut dataset = self.dataset.get_mut().await?;
+        schema_evolution::execute_drop_columns(self, columns).await
-        dataset.drop_columns(columns).await?;
-        Ok(DropColumnsResult {
-            version: dataset.version().version,
-        })
     }
 
     async fn list_indices(&self) -> Result<Vec<IndexConfig>> {

rust/lancedb/src/table/schema_evolution.rs

@@ -0,0 +1,666 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright The LanceDB Authors
+
+//! Schema evolution operations for LanceDB tables.
+//!
+//! This module provides functionality to modify the schema of existing tables:
+//! - [`add_columns`](execute_add_columns): Add new columns using SQL expressions
+//! - [`alter_columns`](execute_alter_columns): Rename columns, change types, or modify nullability
+//! - [`drop_columns`](execute_drop_columns): Remove columns from the table
+
+use lance::dataset::{ColumnAlteration, NewColumnTransform};
+use serde::{Deserialize, Serialize};
+
+use super::NativeTable;
+use crate::Result;
+
+/// The result of an add columns operation.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub struct AddColumnsResult {
+    // The commit version associated with the operation.
+    // A version of `0` indicates compatibility with legacy servers that do not return
+    /// a commit version.
+    #[serde(default)]
+    pub version: u64,
+}
+
+/// The result of an alter columns operation.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub struct AlterColumnsResult {
+    // The commit version associated with the operation.
+    // A version of `0` indicates compatibility with legacy servers that do not return
+    /// a commit version.
+    #[serde(default)]
+    pub version: u64,
+}
+
+/// The result of a drop columns operation.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub struct DropColumnsResult {
+    // The commit version associated with the operation.
+    // A version of `0` indicates compatibility with legacy servers that do not return
+    /// a commit version.
+    #[serde(default)]
+    pub version: u64,
+}
+
+/// Internal implementation of the add columns logic.
+///
+/// Adds new columns to the table using the provided transforms.
+pub(crate) async fn execute_add_columns(
+    table: &NativeTable,
+    transforms: NewColumnTransform,
+    read_columns: Option<Vec<String>>,
+) -> Result<AddColumnsResult> {
+    let mut dataset = table.dataset.get_mut().await?;
+    dataset.add_columns(transforms, read_columns, None).await?;
+    Ok(AddColumnsResult {
+        version: dataset.version().version,
+    })
+}
+
+/// Internal implementation of the alter columns logic.
+///
+/// Alters existing columns in the table (rename, change type, or modify nullability).
+pub(crate) async fn execute_alter_columns(
+    table: &NativeTable,
+    alterations: &[ColumnAlteration],
+) -> Result<AlterColumnsResult> {
+    let mut dataset = table.dataset.get_mut().await?;
+    dataset.alter_columns(alterations).await?;
+    Ok(AlterColumnsResult {
+        version: dataset.version().version,
+    })
+}
+
+/// Internal implementation of the drop columns logic.
+///
+/// Removes columns from the table.
+pub(crate) async fn execute_drop_columns(
+    table: &NativeTable,
+    columns: &[&str],
+) -> Result<DropColumnsResult> {
+    let mut dataset = table.dataset.get_mut().await?;
+    dataset.drop_columns(columns).await?;
+    Ok(DropColumnsResult {
+        version: dataset.version().version,
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use arrow_array::{record_batch, Int32Array, RecordBatchIterator, StringArray};
+    use arrow_schema::DataType;
+    use futures::TryStreamExt;
+    use lance::dataset::ColumnAlteration;
+
+    use crate::connect;
+    use crate::query::{ExecutableQuery, QueryBase, Select};
+    use crate::table::NewColumnTransform;
+
+    // Add Columns Tests
+
+    #[tokio::test]
+    async fn test_add_columns_with_sql_expression() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("id", Int32, [1, 2, 3, 4, 5])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_add_columns",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        let initial_version = table.version().await.unwrap();
+
+        // Add a computed column
+        let result = table
+            .add_columns(
+                NewColumnTransform::SqlExpressions(vec![("doubled".into(), "id * 2".into())]),
+                None,
+            )
+            .await
+            .unwrap();
+
+        // Version should increment
+        assert!(result.version > initial_version);
+
+        // Verify the new column exists with correct values
+        let batches = table
+            .query()
+            .select(Select::columns(&["id", "doubled"]))
+            .execute()
+            .await
+            .unwrap()
+            .try_collect::<Vec<_>>()
+            .await
+            .unwrap();
+
+        let batch = &batches[0];
+        let ids: Vec<i32> = batch
+            .column(0)
+            .as_any()
+            .downcast_ref::<Int32Array>()
+            .unwrap()
+            .iter()
+            .map(|v| v.unwrap())
+            .collect();
+        let doubled: Vec<i32> = batch
+            .column(1)
+            .as_any()
+            .downcast_ref::<Int32Array>()
+            .unwrap()
+            .iter()
+            .map(|v| v.unwrap())
+            .collect();
+
+        for (id, d) in ids.iter().zip(doubled.iter()) {
+            assert_eq!(*d, id * 2);
+        }
+    }
+
+    #[tokio::test]
+    async fn test_add_multiple_columns() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("x", Int32, [10, 20, 30])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_add_multi_columns",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Add multiple columns at once
+        table
+            .add_columns(
+                NewColumnTransform::SqlExpressions(vec![
+                    ("y".into(), "x + 1".into()),
+                    ("z".into(), "x * x".into()),
+                ]),
+                None,
+            )
+            .await
+            .unwrap();
+
+        // Verify schema has all columns
+        let schema = table.schema().await.unwrap();
+        assert_eq!(schema.fields().len(), 3);
+        assert!(schema.field_with_name("x").is_ok());
+        assert!(schema.field_with_name("y").is_ok());
+        assert!(schema.field_with_name("z").is_ok());
+    }
+
+    #[tokio::test]
+    async fn test_add_column_with_constant_expression() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("id", Int32, [1, 2, 3])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_add_const_column",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Add a column with a constant value
+        table
+            .add_columns(
+                NewColumnTransform::SqlExpressions(vec![("constant".into(), "42".into())]),
+                None,
+            )
+            .await
+            .unwrap();
+
+        let schema = table.schema().await.unwrap();
+        assert!(schema.field_with_name("constant").is_ok());
+
+        // Verify all values are 42
+        let batches = table
+            .query()
+            .select(Select::columns(&["constant"]))
+            .execute()
+            .await
+            .unwrap()
+            .try_collect::<Vec<_>>()
+            .await
+            .unwrap();
+
+        let batch = &batches[0];
+        let values = batch["constant"]
+            .as_any()
+            .downcast_ref::<arrow_array::Int64Array>()
+            .unwrap()
+            .values();
+        assert!(values.iter().all(|&v| v == 42));
+    }
+
+    // Alter Columns Tests
+
+    #[tokio::test]
+    async fn test_alter_column_rename() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("old_name", Int32, [1, 2, 3])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_alter_rename",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        let initial_version = table.version().await.unwrap();
+
+        // Rename the column
+        let result = table
+            .alter_columns(&[ColumnAlteration::new("old_name".into()).rename("new_name".into())])
+            .await
+            .unwrap();
+
+        // Version should increment
+        assert!(result.version > initial_version);
+
+        // Verify rename
+        let schema = table.schema().await.unwrap();
+        assert!(schema.field_with_name("old_name").is_err());
+        assert!(schema.field_with_name("new_name").is_ok());
+    }
+
+    #[tokio::test]
+    async fn test_alter_column_set_nullable() {
+        use arrow_array::RecordBatch;
+        use arrow_schema::{Field, Schema};
+        use std::sync::Arc;
+
+        let conn = connect("memory://").execute().await.unwrap();
+
+        // Create a schema with a non-nullable field
+        let schema = Arc::new(Schema::new(vec![Field::new(
+            "value",
+            DataType::Int32,
+            false,
+        )]));
+        let batch = RecordBatch::try_new(
+            schema.clone(),
+            vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
+        )
+        .unwrap();
+
+        let table = conn
+            .create_table(
+                "test_alter_nullable",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Initially non-nullable
+        let schema = table.schema().await.unwrap();
+        assert!(!schema.field_with_name("value").unwrap().is_nullable());
+
+        // Make it nullable
+        table
+            .alter_columns(&[ColumnAlteration::new("value".into()).set_nullable(true)])
+            .await
+            .unwrap();
+
+        // Verify it's now nullable
+        let schema = table.schema().await.unwrap();
+        assert!(schema.field_with_name("value").unwrap().is_nullable());
+    }
+
+    #[tokio::test]
+    async fn test_alter_column_cast_type() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("num", Int32, [1, 2, 3])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_cast_type",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Cast Int32 to Int64 (a supported cast)
+        table
+            .alter_columns(&[ColumnAlteration::new("num".into()).cast_to(DataType::Int64)])
+            .await
+            .unwrap();
+
+        // Verify type changed
+        let schema = table.schema().await.unwrap();
+        assert_eq!(
+            schema.field_with_name("num").unwrap().data_type(),
+            &DataType::Int64
+        );
+
+        // Query the data and verify the returned type is correct
+        let batches = table
+            .query()
+            .execute()
+            .await
+            .unwrap()
+            .try_collect::<Vec<_>>()
+            .await
+            .unwrap();
+        let batch = &batches[0];
+        let values = batch["num"]
+            .as_any()
+            .downcast_ref::<arrow_array::Int64Array>()
+            .unwrap()
+            .values();
+        assert_eq!(values.as_ref(), &[1i64, 2, 3]);
+    }
+
+    #[tokio::test]
+    async fn test_alter_column_invalid_cast_fails() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("num", Int32, [1, 2, 3])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_invalid_cast",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Casting Int32 to Float64 is not supported
+        let result = table
+            .alter_columns(&[ColumnAlteration::new("num".into()).cast_to(DataType::Float64)])
+            .await;
+        let err = result.unwrap_err();
+        assert!(
+            err.to_string().contains("cast"),
+            "Expected error message to contain 'cast', got: {}",
+            err
+        );
+    }
+
+    #[tokio::test]
+    async fn test_alter_multiple_columns() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("a", Int32, [1, 2, 3]), ("b", Int32, [4, 5, 6])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_alter_multi",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Alter multiple columns at once
+        table
+            .alter_columns(&[
+                ColumnAlteration::new("a".into()).rename("alpha".into()),
+                ColumnAlteration::new("b".into()).set_nullable(true),
+            ])
+            .await
+            .unwrap();
+
+        let schema = table.schema().await.unwrap();
+        assert!(schema.field_with_name("alpha").is_ok());
+        assert!(schema.field_with_name("a").is_err());
+        assert!(schema.field_with_name("b").unwrap().is_nullable());
+    }
+
+    // Drop Columns Tests
+
+    #[tokio::test]
+    async fn test_drop_single_column() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch =
+            record_batch!(("keep", Int32, [1, 2, 3]), ("remove", Int32, [4, 5, 6])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_drop_single",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        let initial_version = table.version().await.unwrap();
+
+        // Drop a column
+        let result = table.drop_columns(&["remove"]).await.unwrap();
+
+        // Version should increment
+        assert!(result.version > initial_version);
+
+        // Verify column was dropped
+        let schema = table.schema().await.unwrap();
+        assert_eq!(schema.fields().len(), 1);
+        assert!(schema.field_with_name("keep").is_ok());
+        assert!(schema.field_with_name("remove").is_err());
+    }
+
+    #[tokio::test]
+    async fn test_drop_multiple_columns() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(
+            ("a", Int32, [1, 2]),
+            ("b", Int32, [3, 4]),
+            ("c", Int32, [5, 6]),
+            ("d", Int32, [7, 8])
+        )
+        .unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_drop_multi",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Drop multiple columns
+        table.drop_columns(&["b", "d"]).await.unwrap();
+
+        // Verify only a and c remain
+        let schema = table.schema().await.unwrap();
+        assert_eq!(schema.fields().len(), 2);
+        assert!(schema.field_with_name("a").is_ok());
+        assert!(schema.field_with_name("c").is_ok());
+        assert!(schema.field_with_name("b").is_err());
+        assert!(schema.field_with_name("d").is_err());
+    }
+
+    #[tokio::test]
+    async fn test_drop_column_preserves_data() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(
+            ("id", Int32, [1, 2, 3]),
+            ("name", Utf8, ["a", "b", "c"]),
+            ("extra", Int32, [10, 20, 30])
+        )
+        .unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_drop_preserves",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Drop the extra column
+        table.drop_columns(&["extra"]).await.unwrap();
+
+        // Verify remaining data is intact
+        let batches = table
+            .query()
+            .execute()
+            .await
+            .unwrap()
+            .try_collect::<Vec<_>>()
+            .await
+            .unwrap();
+
+        let batch = &batches[0];
+        assert_eq!(batch.num_columns(), 2);
+        assert_eq!(batch.num_rows(), 3);
+
+        let ids: Vec<i32> = batch
+            .column(0)
+            .as_any()
+            .downcast_ref::<Int32Array>()
+            .unwrap()
+            .iter()
+            .map(|v| v.unwrap())
+            .collect();
+        assert_eq!(ids, vec![1, 2, 3]);
+
+        let names: Vec<&str> = batch
+            .column(1)
+            .as_any()
+            .downcast_ref::<StringArray>()
+            .unwrap()
+            .iter()
+            .map(|v| v.unwrap())
+            .collect();
+        assert_eq!(names, vec!["a", "b", "c"]);
+    }
+
+    // Error Case Tests
+
+    #[tokio::test]
+    async fn test_drop_nonexistent_column_fails() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("existing", Int32, [1, 2, 3])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_drop_nonexistent",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Try to drop a column that doesn't exist
+        let result = table.drop_columns(&["nonexistent"]).await;
+        let err = result.unwrap_err();
+        assert!(
+            err.to_string().contains("nonexistent"),
+            "Expected error message to contain column name 'nonexistent', got: {}",
+            err
+        );
+    }
+
+    #[tokio::test]
+    async fn test_alter_nonexistent_column_fails() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("existing", Int32, [1, 2, 3])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_alter_nonexistent",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        // Try to alter a column that doesn't exist
+        let result = table
+            .alter_columns(&[ColumnAlteration::new("nonexistent".into()).rename("new".into())])
+            .await;
+        let err = result.unwrap_err();
+        assert!(
+            err.to_string().contains("nonexistent"),
+            "Expected error message to contain column name 'nonexistent', got: {}",
+            err
+        );
+    }
+
+    // Version Tracking Tests
+
+    #[tokio::test]
+    async fn test_schema_operations_increment_version() {
+        let conn = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("a", Int32, [1, 2, 3]), ("b", Int32, [4, 5, 6])).unwrap();
+        let schema = batch.schema();
+
+        let table = conn
+            .create_table(
+                "test_version_increment",
+                RecordBatchIterator::new(vec![Ok(batch)], schema),
+            )
+            .execute()
+            .await
+            .unwrap();
+
+        let v1 = table.version().await.unwrap();
+
+        // Add column increments version
+        let add_result = table
+            .add_columns(
+                NewColumnTransform::SqlExpressions(vec![("c".into(), "a + b".into())]),
+                None,
+            )
+            .await
+            .unwrap();
+        assert!(add_result.version > v1);
+        let v2 = table.version().await.unwrap();
+        assert_eq!(add_result.version, v2);
+
+        // Alter column increments version
+        let alter_result = table
+            .alter_columns(&[ColumnAlteration::new("c".into()).rename("sum".into())])
+            .await
+            .unwrap();
+        assert!(alter_result.version > v2);
+        let v3 = table.version().await.unwrap();
+        assert_eq!(alter_result.version, v3);
+
+        // Drop column increments version
+        let drop_result = table.drop_columns(&["b"]).await.unwrap();
+        assert!(drop_result.version > v3);
+        let v4 = table.version().await.unwrap();
+        assert_eq!(drop_result.version, v4);
+    }
+}