fix: preserve namespace drop errors (#4099)

## Summary

- preserve typed namespace errors returned by `drop_table`
- return `TableNotFound` when dropping an absent namespace table
- cover repeated drop behavior in the namespace database test

## Validation

- `cargo test --quiet --features remote -p lancedb
database::namespace::tests::test_namespace_drop_table --lib`
- `cargo clippy --quiet --features remote -p lancedb --lib --tests -- -D
warnings`

## Context

Sophon SQL implements `DROP TABLE IF EXISTS` by matching
`lancedb::Error::TableNotFound`. The namespace database previously
wrapped this error as `Runtime`, causing cleanup to fail and mask an
earlier statement error.

.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.38.0-beta.14"
+current_version = "0.38.0"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.

Cargo.lock

@@ -535,9 +535,9 @@ dependencies = [
 
 [[package]]
 name = "async-trait"
-version = "0.1.91"
+version = "0.1.92"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae36dc4177970ef04fde5178d3e2429882def40e57a451f919c098f72baa6cec"
+checksum = "82f6aeea286b8eb4dd3431a1be1b59d290ace00f5bfd8e2a159bc2a05e2c1667"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1443,9 +1443,9 @@ checksum = "175812e0be2bccb6abe50bb8d566126198344f707e304f45c648fd8f2cc0365e"
 
 [[package]]
 name = "bytemuck"
-version = "1.25.0"
+version = "1.25.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8efb64bd706a16a1bdde310ae86b351e4d21550d98d056f22f8a7f7a2183fec"
+checksum = "95832e849adfb21180ccb6826a99da14e5d266ae5c2e668e1602cf234f153797"
 dependencies = [
  "bytemuck_derive",
 ]
@@ -5402,7 +5402,7 @@ dependencies = [
 
 [[package]]
 name = "lancedb"
-version = "0.38.0-beta.14"
+version = "0.38.0"
 dependencies = [
  "ahash",
  "anyhow",
@@ -5490,7 +5490,7 @@ dependencies = [
 
 [[package]]
 name = "lancedb-nodejs"
-version = "0.38.0-beta.14"
+version = "0.38.0"
 dependencies = [
  "arrow-array",
  "arrow-buffer",
@@ -5515,7 +5515,7 @@ dependencies = [
 
 [[package]]
 name = "lancedb-python"
-version = "0.38.0-beta.14"
+version = "0.38.0"
 dependencies = [
  "arrow",
  "async-trait",
@@ -5748,9 +5748,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.33"
+version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ceec5bc11778974d1bcb055b18002eba7f4b3518b6a0081b3af5f21666da9ad"
+checksum = "f9f8bd3e56ce4dfc153cf470fffbfa98c7620958b312ca5c3a4b8d5181fd13c6"
 
 [[package]]
 name = "loom"
@@ -6001,9 +6001,9 @@ dependencies = [
 
 [[package]]
 name = "moka"
-version = "0.12.15"
+version = "0.12.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "957228ad12042ee839f93c8f257b62b4c0ab5eaae1d4fa60de53b27c9d7c5046"
+checksum = "4293f18e7567a1caf3c584855554377025c65e0aa445344d04171f5ad63d19b9"
 dependencies = [
  "async-lock",
  "crossbeam-channel",
@@ -6097,14 +6097,15 @@ dependencies = [
 
 [[package]]
 name = "napi"
-version = "3.11.0"
+version = "3.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de33522036981030a75c231829566bc63414e08101a6f5ff4ac6cef19c8e0941"
+checksum = "58c5f4d5375213fdb7be2655e152386e82f026f9a5ba36a75556e11359aafe09"
 dependencies = [
  "bitflags 2.11.1",
  "chrono",
  "ctor 1.0.12",
  "futures",
+ "libc",
  "napi-build",
  "napi-sys",
  "nohash-hasher",
@@ -6116,15 +6117,15 @@ dependencies = [
 
 [[package]]
 name = "napi-build"
-version = "2.4.0"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5282704fbe8d49b0cf8b08e3f33233416a528658f205c7e5ace63b582de0b11c"
+checksum = "60fdf9b392c50e7c4170fa633bd909490ed7835cea4c046776d1a4dd8d2ae0ab"
 
 [[package]]
 name = "napi-derive"
-version = "3.6.1"
+version = "3.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d5c9c02556ea6dc99dffd36c1ce60141411657438501a125b675776d011ce92"
+checksum = "0fa55ea69990c90b888e9e77044410e304ce7f35de599dc6d0b5c1923d2e59af"
 dependencies = [
  "convert_case",
  "ctor 1.0.12",
@@ -6136,9 +6137,9 @@ dependencies = [
 
 [[package]]
 name = "napi-derive-backend"
-version = "6.1.1"
+version = "6.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d60b5d773ad46c698c8cc2cd9fde0b283d39cbb7f71c04bee633c7bdba4423bd"
+checksum = "df4056ac7c18e4438ccf0edaed4340ca0d269278c8ec19284f7b23cb039fd0ae"
 dependencies = [
  "convert_case",
  "proc-macro2",
@@ -8601,9 +8602,9 @@ dependencies = [
 
 [[package]]
 name = "roaring"
-version = "0.11.4"
+version = "0.11.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1dedc5658c6ecb3bdb5ef5f3295bb9253f42dcf3fd1402c03f6b1f7659c3c4a9"
+checksum = "18bd8a37d17a58532776dcdf6041ce64929adca78e8489d5cacbafe99229d3e1"
 dependencies = [
  "bytemuck",
  "byteorder",
@@ -9063,9 +9064,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.21.0"
+version = "3.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76a5c54c7310e7b8b9577c286d7e399ddd876c3e12b3ed917a8aabc4b96e9e8c"
+checksum = "ee78f1fbe43ac4a0e47aadb3dbd357b69eb0d3793e948624cd03dd2750ab1c0a"
 dependencies = [
  "base64 0.22.1",
  "bs58",
@@ -9073,6 +9074,7 @@ dependencies = [
  "hex",
  "indexmap 1.9.3",
  "indexmap 2.14.0",
+ "jiff",
  "schemars 0.9.0",
  "schemars 1.2.1",
  "serde_core",
@@ -9083,9 +9085,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.21.0"
+version = "3.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84d57bc0c8b9a17920c178daa6bb924850d54a9c97ab45194bb8c17ad66bb660"
+checksum = "8705578779c2b6bd90d84d66eb2e206b708b1a4d7b9f17641b293545bf1c7e46"
 dependencies = [
  "darling 0.23.0",
  "proc-macro2",
@@ -10452,9 +10454,9 @@ checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
 [[package]]
 name = "uuid"
-version = "1.24.0"
+version = "1.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf3923a6f5c4c6382e0b653c4117f48d631ea17f38ed86e2a828e6f7412f5239"
+checksum = "b5772d71c9be8a8a6ac2117d949c5b224c1b72241bb611d9a3012edcf8af7812"
 dependencies = [
  "getrandom 0.4.2",
  "js-sys",

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>0.38.0-beta.14</version>
+    <version>0.38.0</version>
 </dependency>
 ```
 

java/lancedb-core/pom.xml

@@ -8,7 +8,7 @@
     <parent>
       <groupId>com.lancedb</groupId>
       <artifactId>lancedb-parent</artifactId>
-      <version>0.38.0-beta.14</version>
+      <version>0.38.0-final.0</version>
       <relativePath>../pom.xml</relativePath>
     </parent>
 

java/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.lancedb</groupId>
     <artifactId>lancedb-parent</artifactId>
-    <version>0.38.0-beta.14</version>
+    <version>0.38.0-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 = "0.38.0-beta.14"
+version = "0.38.0"
 publish = false
 license.workspace = true
 description.workspace = true

nodejs/npm/darwin-arm64/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-darwin-arm64",
-	"version": "0.38.0-beta.14",
+	"version": "0.38.0",
 	"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": "0.38.0-beta.14",
+	"version": "0.38.0",
 	"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": "0.38.0-beta.14",
+	"version": "0.38.0",
 	"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": "0.38.0-beta.14",
+	"version": "0.38.0",
 	"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": "0.38.0-beta.14",
+	"version": "0.38.0",
 	"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": "0.38.0-beta.14",
+  "version": "0.38.0",
   "os": [
     "win32"
   ],

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

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-win32-x64-msvc",
-	"version": "0.38.0-beta.14",
+	"version": "0.38.0",
 	"os": ["win32"],
 	"cpu": ["x64"],
 	"main": "lancedb.win32-x64-msvc.node",

nodejs/package.json

@@ -11,7 +11,7 @@
     "ann"
   ],
   "private": false,
-  "version": "0.38.0-beta.14",
+  "version": "0.38.0",
   "main": "dist/index.js",
   "exports": {
     ".": "./dist/index.js",

nodejs/src/query.rs

@@ -664,7 +664,11 @@ impl JsFullTextQuery {
 }
 
 fn parse_fts_query(query: Object) -> napi::Result<FullTextSearchQuery> {
-    if let Ok(Some(query)) = query.get::<&JsFullTextQuery>("query") {
+    // `&JsFullTextQuery` recovers a native class reference through napi's borrow-tracked
+    // path, which is only usable from generated `#[napi]` argument conversion. This is a
+    // manual lookup on a nested `Object` property instead, so use `ClassInstance`, which
+    // unwraps the class without requiring a borrow scope.
+    if let Ok(Some(query)) = query.get::<ClassInstance<JsFullTextQuery>>("query") {
         Ok(FullTextSearchQuery::new_query(query.inner.clone()))
     } else if let Ok(Some(query_text)) = query.get::<String>("query") {
         let mut query_text = query_text;

python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb-python"
-version = "0.38.0-beta.14"
+version = "0.38.0"
 publish = false
 edition.workspace = true
 description = "Python bindings for LanceDB"

python/python/lancedb/_lancedb.pyi

@@ -150,6 +150,7 @@ class Connection(object):
     def job(self, job_id: str) -> Job: ...
     async def create_function_async(self, request_json: str) -> Job: ...
     async def get_function(self, name: str, version: str) -> str: ...
+    async def drop_function(self, name: str, version: str) -> bool: ...
     async def list_jobs(self) -> List[JobInfo]: ...
     async def get_job(self, job_id: str) -> Optional[JobDescription]: ...
     async def cancel_job(self, job_id: str) -> bool: ...

python/python/lancedb/db.py

@@ -712,6 +712,16 @@ class DBConnection(EnforceOverrides):
             "Function catalog operations are not supported for this connection type"
         )
 
+    def drop_function(self, name: str, *, version: str) -> bool:
+        """Drop one exact immutable Function version from the remote catalog.
+
+        Returns True when the version changed to Dropped and False for an
+        idempotent replay. Local connections raise NotImplementedError.
+        """
+        raise NotImplementedError(
+            "Function catalog operations are not supported for this connection type"
+        )
+
     def job(self, job_id: str) -> Job:
         """A [Job][lancedb.job.Job] handle for a server-side job by id.
 
@@ -1413,6 +1423,10 @@ class LanceDBConnection(DBConnection):
     def get_function(self, name: str, *, version: str) -> FunctionVersion:
         return LOOP.run(self._conn.get_function(name, version=version))
 
+    @override
+    def drop_function(self, name: str, *, version: str) -> bool:
+        return LOOP.run(self._conn.drop_function(name, version=version))
+
     @override
     def list_jobs(self) -> List[JobInfo]:
         """List server-side jobs across the database's tables."""
@@ -2243,6 +2257,10 @@ class AsyncConnection(object):
         """Open one exact immutable Function version from the remote catalog."""
         return FunctionVersion.from_json(await self._inner.get_function(name, version))
 
+    async def drop_function(self, name: str, *, version: str) -> bool:
+        """Drop one exact immutable Function version from the remote catalog."""
+        return await self._inner.drop_function(name, version)
+
     async def list_jobs(self) -> List[JobInfo]:
         """List server-side jobs across the database's tables."""
         return await self._inner.list_jobs()

python/python/lancedb/remote/db.py

@@ -749,6 +749,10 @@ class RemoteDBConnection(DBConnection):
     def get_function(self, name: str, *, version: str) -> FunctionVersion:
         return LOOP.run(self._conn.get_function(name, version=version))
 
+    @override
+    def drop_function(self, name: str, *, version: str) -> bool:
+        return LOOP.run(self._conn.drop_function(name, version=version))
+
     @override
     def list_jobs(self) -> List["JobInfo"]:
         """List server-side jobs across the database's tables."""

python/python/tests/test_first_class_function_slice2.py

@@ -12,6 +12,8 @@ from datetime import date
 import http.server
 import json
 from pathlib import Path
+import subprocess
+import sys
 import threading
 from typing import Optional
 
@@ -67,6 +69,80 @@ def test_scalar_udf_matches_shared_registration_golden_and_remains_callable():
     }
 
 
+def _main_udf_source(
+    *, threshold: int = 20, input_annotation: str = "int", comparison: str = ">="
+) -> str:
+    return (
+        "from __future__ import annotations\n"
+        "from lancedb.functions import udf\n"
+        f"THRESHOLD = {threshold}\n"
+        "\n"
+        "@udf\n"
+        f"def label(value: {input_annotation}) -> str:\n"
+        f"    return 'big' if value {comparison} THRESHOLD else 'small'\n"
+        "\n"
+        "assert label.__module__ == '__main__'\n"
+        "print(label.registration_request.to_canonical_json())\n"
+    )
+
+
+def _run_main_udf(path: Path, source: str) -> dict:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(source)
+    result = subprocess.run(
+        [sys.executable, str(path)],
+        check=True,
+        capture_output=True,
+        text=True,
+    )
+    return json.loads(result.stdout)
+
+
+def test_main_udf_registration_identity_is_stable_across_processes_and_paths(
+    tmp_path,
+):
+    source = _main_udf_source()
+    original_path = tmp_path / "original" / "job.py"
+    moved_path = tmp_path / "moved" / "renamed_job.py"
+
+    original_runs = [_run_main_udf(original_path, source) for _ in range(2)]
+    moved_run = _run_main_udf(moved_path, source)
+
+    assert len({run["artifact"]["digest"] for run in [*original_runs, moved_run]}) == 1
+    assert all(
+        run["signature"] == original_runs[0]["signature"]
+        for run in [original_runs[1], moved_run]
+    )
+    assert original_runs[0] == original_runs[1] == moved_run
+
+    body_change = _run_main_udf(
+        tmp_path / "changes" / "body.py", _main_udf_source(comparison=">")
+    )
+    global_change = _run_main_udf(
+        tmp_path / "changes" / "global.py", _main_udf_source(threshold=21)
+    )
+    annotation_change = _run_main_udf(
+        tmp_path / "changes" / "annotation.py",
+        _main_udf_source(input_annotation="float"),
+    )
+
+    baseline = original_runs[0]
+    assert baseline["signature"] == body_change["signature"]
+    assert baseline["signature"] == global_change["signature"]
+    assert baseline["signature"] != annotation_change["signature"]
+    assert (
+        len(
+            {
+                baseline["artifact"]["digest"],
+                body_change["artifact"]["digest"],
+                global_change["artifact"]["digest"],
+                annotation_change["artifact"]["digest"],
+            }
+        )
+        == 4
+    )
+
+
 def _run_packaged(definition, *args):
     """Execute the shipped artifact in a fresh namespace, as a worker would."""
     source = base64.b64decode(definition.registration_request.artifact.content.data)
@@ -941,6 +1017,8 @@ def test_local_function_catalog_operations_are_not_supported(tmp_path):
         db.create_function_async(normalize_score)
     with pytest.raises(NotImplementedError, match=message):
         db.get_function("normalize_score", version="fv_exact")
+    with pytest.raises(NotImplementedError, match=message):
+        db.drop_function("normalize_score", version="fv_exact")
 
 
 @contextlib.contextmanager
@@ -986,6 +1064,12 @@ def _mock_remote_function_catalog():
                     "version": "fv_exact",
                 }
                 response = state["version"]
+            elif self.path == "/v1/functions/drop":
+                assert body == {
+                    "name": "normalize_score",
+                    "version": "fv_exact",
+                }
+                response = {"dropped": True}
             else:
                 status = 404
                 response = {"error": "not found"}
@@ -1044,3 +1128,40 @@ def test_blocking_remote_registration_returns_function_version():
         "/v1/functions/create",
         "/v1/jobs/describe",
     ]
+
+
+def test_remote_drop_function_sends_exact_version():
+    with _mock_remote_function_catalog() as (host, state):
+        db = lancedb.connect(
+            "db://dev",
+            api_key="fake",
+            host_override=host,
+            client_config={"retry_config": {"retries": 0}},
+        )
+        assert db.drop_function("normalize_score", version="fv_exact") is True
+
+    assert state["requests"] == [
+        (
+            "/v1/functions/drop",
+            {"name": "normalize_score", "version": "fv_exact"},
+        )
+    ]
+
+
+@pytest.mark.asyncio
+async def test_async_remote_drop_function_sends_exact_version():
+    with _mock_remote_function_catalog() as (host, state):
+        db = await lancedb.connect_async(
+            "db://dev",
+            api_key="fake",
+            host_override=host,
+            client_config={"retry_config": {"retries": 0}},
+        )
+        assert await db.drop_function("normalize_score", version="fv_exact") is True
+
+    assert state["requests"] == [
+        (
+            "/v1/functions/drop",
+            {"name": "normalize_score", "version": "fv_exact"},
+        )
+    ]

python/src/connection.rs

@@ -629,6 +629,17 @@ impl Connection {
         })
     }
 
+    pub fn drop_function(
+        self_: PyRef<'_, Self>,
+        name: String,
+        version: String,
+    ) -> PyResult<Bound<'_, PyAny>> {
+        let inner = self_.get_inner()?.clone();
+        future_into_py(self_.py(), async move {
+            inner.drop_function(name, version).await.infer_error()
+        })
+    }
+
     pub fn list_jobs(self_: PyRef<'_, Self>) -> PyResult<Bound<'_, PyAny>> {
         let inner = self_.get_inner()?.clone();
         future_into_py(self_.py(), async move {

rust/lancedb/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb"
-version = "0.38.0-beta.14"
+version = "0.38.0"
 edition.workspace = true
 description = "LanceDB: A serverless, low-latency vector database for AI applications"
 license.workspace = true

rust/lancedb/src/connection.rs

@@ -523,6 +523,21 @@ impl Connection {
             .await
     }
 
+    /// Drop one exact immutable Function version from the remote catalog.
+    ///
+    /// Returns `true` when the server appended a Dropped transition and
+    /// `false` for an idempotent replay. Local databases return
+    /// [`Error::NotSupported`].
+    pub async fn drop_function(
+        &self,
+        name: impl AsRef<str>,
+        version: impl AsRef<str>,
+    ) -> Result<bool> {
+        self.internal
+            .drop_function(name.as_ref(), version.as_ref())
+            .await
+    }
+
     /// Rename a table in the database.
     ///
     /// This is only supported in LanceDB Cloud.

rust/lancedb/src/database.rs

@@ -307,6 +307,10 @@ pub trait Database:
     ) -> Result<crate::function::FunctionVersion> {
         function_catalog_not_supported()
     }
+    /// Drop one exact immutable Function version from the remote catalog.
+    async fn drop_function(&self, _name: &str, _version: &str) -> Result<bool> {
+        function_catalog_not_supported()
+    }
     /// A [`crate::job::Job`] handle for a server-side job by id, suitable for
     /// waiting on or cancelling the job. The handle is constructed without a
     /// server round trip; an unknown id surfaces when the handle is used.

rust/lancedb/src/database/namespace.rs

@@ -539,9 +539,7 @@ impl Database for LanceNamespaceDatabase {
         self.namespace
             .drop_table(drop_request)
             .await
-            .map_err(|e| Error::Runtime {
-                message: format!("Failed to drop table: {}", e),
-            })?;
+            .map_err(|e| map_namespace_lance_error(e, name))?;
 
         Ok(())
     }
@@ -1495,6 +1493,15 @@ mod tests {
             .expect("Failed to list tables");
         assert!(!table_names_after.contains(&"drop_test".to_string()));
 
+        let error = conn
+            .drop_table("drop_test", &["test_ns".into()])
+            .await
+            .expect_err("dropping a missing table should fail");
+        assert!(
+            matches!(error, Error::TableNotFound { ref name, .. } if name == "drop_test"),
+            "expected TableNotFound, got: {error:?}"
+        );
+
         // Verify: Cannot open dropped table
         let open_result = conn.open_table("drop_test").execute().await;
         assert!(open_result.is_err());

rust/lancedb/src/remote/db.rs

@@ -533,6 +533,11 @@ struct RemoteListJobsResponse {
     page_token: Option<String>,
 }
 
+#[derive(serde::Deserialize)]
+struct RemoteDropFunctionResponse {
+    dropped: bool,
+}
+
 /// Bound on `list_jobs` page walking; a warning is logged when the listing
 /// is truncated at this many pages.
 const MAX_LIST_JOBS_PAGES: usize = 100;
@@ -583,6 +588,20 @@ impl<S: HttpSend> Database for RemoteDatabase<S> {
         response.json().await.err_to_http(request_id)
     }
 
+    async fn drop_function(&self, name: &str, version: &str) -> Result<bool> {
+        let req = self
+            .client
+            .post("/v1/functions/drop")
+            .json(&serde_json::json!({
+                "name": name,
+                "version": version,
+            }));
+        let (request_id, response) = self.client.send(req).await?;
+        let response = self.client.check_response(&request_id, response).await?;
+        let response: RemoteDropFunctionResponse = response.json().await.err_to_http(request_id)?;
+        Ok(response.dropped)
+    }
+
     fn job(&self, job_id: &str) -> Result<crate::job::Job> {
         Ok(crate::job::Job::new(Box::new(super::job::RemoteJob::new(
             self.client.clone(),
@@ -2689,6 +2708,25 @@ mod tests {
         assert_eq!(version.version(), "fv_01K3EXACT");
     }
 
+    #[tokio::test]
+    async fn test_drop_function_sends_exact_version_and_decodes_replay() {
+        let conn = Connection::new_with_handler(|request| {
+            assert_eq!(request.method(), &reqwest::Method::POST);
+            assert_eq!(request.url().path(), "/v1/functions/drop");
+            let body: serde_json::Value =
+                serde_json::from_slice(request.body().unwrap().as_bytes().unwrap()).unwrap();
+            assert_eq!(
+                body,
+                serde_json::json!({"name": "embed", "version": "fv_01K3EXACT"})
+            );
+            http::Response::builder()
+                .status(200)
+                .body(r#"{"dropped":false}"#)
+                .unwrap()
+        });
+        assert!(!conn.drop_function("embed", "fv_01K3EXACT").await.unwrap());
+    }
+
     #[tokio::test]
     async fn test_conn_job_waits_to_done() {
         let polls = Arc::new(AtomicUsize::new(0));

rust/lancedb/tests/first_class_function_slice2.rs

@@ -45,7 +45,11 @@ async fn local_function_catalog_operations_return_stable_not_supported() {
         .get_function("normalize_score", "fv_exact")
         .await
         .unwrap_err();
-    for error in [create_error, lookup_error] {
+    let drop_error = connection
+        .drop_function("normalize_score", "fv_exact")
+        .await
+        .unwrap_err();
+    for error in [create_error, lookup_error, drop_error] {
         assert!(matches!(
             error,
             Error::NotSupported { message }