Bump version: 0.30.2-beta.0 → 0.30.2-beta.1

## Summary
- Update all lance workspace dependencies from v3.0.1 (crates.io) to
v4.0.0-rc.3 (git tag)
- Pin AWS SDK transitive dependencies to versions compatible with Rust
1.91.0 MSRV

## Test plan
- [x] `cargo check --features remote --tests --examples` passes
- [x] `cargo clippy --features remote --tests --examples` passes
- [x] Python bindings compile (`cargo check -p lancedb-python`)
- [ ] CI passes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.27.0"
+current_version = "0.27.2-beta.0"
 parse = """(?x)
     (?P<major>0|[1-9]\\d*)\\.
     (?P<minor>0|[1-9]\\d*)\\.

.github/workflows/rust.yml

@@ -207,14 +207,14 @@ jobs:
       - name: Downgrade  dependencies
         # These packages have newer requirements for MSRV
         run: |
-          cargo update -p aws-sdk-bedrockruntime --precise 1.64.0
+          cargo update -p aws-sdk-bedrockruntime --precise 1.77.0
-          cargo update -p aws-sdk-dynamodb --precise 1.55.0
+          cargo update -p aws-sdk-dynamodb --precise 1.68.0
-          cargo update -p aws-config --precise 1.5.10
+          cargo update -p aws-config --precise 1.6.0
-          cargo update -p aws-sdk-kms --precise 1.51.0
+          cargo update -p aws-sdk-kms --precise 1.63.0
-          cargo update -p aws-sdk-s3 --precise 1.65.0
+          cargo update -p aws-sdk-s3 --precise 1.79.0
-          cargo update -p aws-sdk-sso --precise 1.50.0
+          cargo update -p aws-sdk-sso --precise 1.62.0
-          cargo update -p aws-sdk-ssooidc --precise 1.51.0
+          cargo update -p aws-sdk-ssooidc --precise 1.63.0
-          cargo update -p aws-sdk-sts --precise 1.51.0
+          cargo update -p aws-sdk-sts --precise 1.63.0
           cargo update -p home --precise 0.5.9
       - name: cargo +${{ matrix.msrv }} check
         env:

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 = { "version" = "=4.0.0-rc.3", default-features = false, "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-core = { version = "=3.0.1" }
+lance-core = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-datagen = { version = "=3.0.1" }
+lance-datagen = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-file = { version = "=3.0.1" }
+lance-file = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-io = { version = "=3.0.1", default-features = false }
+lance-io = { "version" = "=4.0.0-rc.3", default-features = false, "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-index = { version = "=3.0.1" }
+lance-index = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-linalg = { version = "=3.0.1" }
+lance-linalg = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-namespace = { version = "=3.0.1" }
+lance-namespace = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-namespace-impls = { version = "=3.0.1", default-features = false }
+lance-namespace-impls = { "version" = "=4.0.0-rc.3", default-features = false, "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-table = { version = "=3.0.1" }
+lance-table = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-testing = { version = "=3.0.1" }
+lance-testing = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-datafusion = { version = "=3.0.1" }
+lance-datafusion = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-encoding = { version = "=3.0.1" }
+lance-encoding = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "git" = "https://github.com/lance-format/lance.git" }
-lance-arrow = { version = "=3.0.1" }
+lance-arrow = { "version" = "=4.0.0-rc.3", "tag" = "v4.0.0-rc.3", "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/requirements.txt

@@ -1,8 +1,8 @@
-mkdocs==1.5.3
+mkdocs==1.6.1
 mkdocs-jupyter==0.24.1
-mkdocs-material==9.5.3
+mkdocs-material==9.6.23
 mkdocs-autorefs>=0.5,<=1.0
-mkdocstrings[python]==0.25.2
+mkdocstrings[python]>=0.24,<1.0
 griffe>=0.40,<1.0
 mkdocs-render-swagger-plugin>=0.1.0
 pydantic>=2.0,<3.0

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>0.27.0</version>
+    <version>0.27.2-beta.0</version>
 </dependency>
 ```
 

java/lancedb-core/pom.xml

@@ -8,7 +8,7 @@
     <parent>
       <groupId>com.lancedb</groupId>
       <artifactId>lancedb-parent</artifactId>
-      <version>0.27.0-final.0</version>
+      <version>0.27.2-beta.0</version>
       <relativePath>../pom.xml</relativePath>
     </parent>
 

java/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.lancedb</groupId>
     <artifactId>lancedb-parent</artifactId>
-    <version>0.27.0-final.0</version>
+    <version>0.27.2-beta.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>3.1.0-beta.2</lance-core.version>
+        <lance-core.version>3.0.1</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 = "0.27.0"
+version = "0.27.2-beta.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": "0.27.0",
+	"version": "0.27.2-beta.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": "0.27.0",
+	"version": "0.27.2-beta.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": "0.27.0",
+	"version": "0.27.2-beta.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": "0.27.0",
+	"version": "0.27.2-beta.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": "0.27.0",
+	"version": "0.27.2-beta.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": "0.27.0",
+  "version": "0.27.2-beta.0",
   "os": [
     "win32"
   ],

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

@@ -1,6 +1,6 @@
 {
 	"name": "@lancedb/lancedb-win32-x64-msvc",
-	"version": "0.27.0",
+	"version": "0.27.2-beta.0",
 	"os": ["win32"],
 	"cpu": ["x64"],
 	"main": "lancedb.win32-x64-msvc.node",

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@lancedb/lancedb",
-  "version": "0.27.0",
+  "version": "0.27.2-beta.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@lancedb/lancedb",
-      "version": "0.27.0",
+      "version": "0.27.2-beta.0",
       "cpu": [
         "x64",
         "arm64"

nodejs/package.json

@@ -11,7 +11,7 @@
     "ann"
   ],
   "private": false,
-  "version": "0.27.0",
+  "version": "0.27.2-beta.0",
   "main": "dist/index.js",
   "exports": {
     ".": "./dist/index.js",

python/.bumpversion.toml

@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.30.1"
+current_version = "0.30.2-beta.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 = "0.30.1"
+version = "0.30.2-beta.1"
 edition.workspace = true
 description = "Python bindings for LanceDB"
 license.workspace = true
@@ -23,6 +23,7 @@ lance-namespace.workspace = true
 lance-namespace-impls.workspace = true
 lance-io.workspace = true
 env_logger.workspace = true
+log.workspace = true
 pyo3 = { version = "0.26", features = ["extension-module", "abi3-py39"] }
 pyo3-async-runtimes = { version = "0.26", features = [
     "attributes",

python/python/lancedb/_lancedb.pyi

@@ -135,7 +135,10 @@ class Table:
     def close(self) -> None: ...
     async def schema(self) -> pa.Schema: ...
     async def add(
-        self, data: pa.RecordBatchReader, mode: Literal["append", "overwrite"]
+        self,
+        data: pa.RecordBatchReader,
+        mode: Literal["append", "overwrite"],
+        progress: Optional[Any] = None,
     ) -> AddResult: ...
     async def update(
         self, updates: Dict[str, str], where: Optional[str]

python/python/lancedb/remote/table.py

@@ -4,7 +4,7 @@
 from datetime import timedelta
 import logging
 from functools import cached_property
-from typing import Dict, Iterable, List, Optional, Union, Literal
+from typing import Any, Callable, Dict, Iterable, List, Optional, Union, Literal
 import warnings
 
 from lancedb._lancedb import (
@@ -35,6 +35,7 @@ import pyarrow as pa
 from lancedb.common import DATA, VEC, VECTOR_COLUMN_NAME
 from lancedb.merge import LanceMergeInsertBuilder
 from lancedb.embeddings import EmbeddingFunctionRegistry
+from lancedb.table import _normalize_progress
 
 from ..query import LanceVectorQueryBuilder, LanceQueryBuilder, LanceTakeQueryBuilder
 from ..table import AsyncTable, IndexStatistics, Query, Table, Tags
@@ -308,6 +309,7 @@ class RemoteTable(Table):
         mode: str = "append",
         on_bad_vectors: str = "error",
         fill_value: float = 0.0,
+        progress: Optional[Union[bool, Callable, Any]] = None,
     ) -> AddResult:
         """Add more data to the [Table](Table). It has the same API signature as
         the OSS version.
@@ -330,17 +332,29 @@ class RemoteTable(Table):
             One of "error", "drop", "fill".
         fill_value: float, default 0.
             The value to use when filling vectors. Only used if on_bad_vectors="fill".
+        progress: bool, callable, or tqdm-like, optional
+            A callback or tqdm-compatible progress bar. See
+            :meth:`Table.add` for details.
 
         Returns
         -------
         AddResult
             An object containing the new version number of the table after adding data.
         """
-        return LOOP.run(
+        progress, owns = _normalize_progress(progress)
-            self._table.add(
+        try:
-                data, mode=mode, on_bad_vectors=on_bad_vectors, fill_value=fill_value
+            return LOOP.run(
+                self._table.add(
+                    data,
+                    mode=mode,
+                    on_bad_vectors=on_bad_vectors,
+                    fill_value=fill_value,
+                    progress=progress,
+                )
             )
-        )
+        finally:
+            if owns:
+                progress.close()
 
     def search(
         self,

python/python/lancedb/table.py

@@ -14,6 +14,7 @@ from functools import cached_property
 from typing import (
     TYPE_CHECKING,
     Any,
+    Callable,
     Dict,
     Iterable,
     List,
@@ -556,6 +557,21 @@ def _table_uri(base: str, table_name: str) -> str:
     return join_uri(base, f"{table_name}.lance")
 
 
+def _normalize_progress(progress):
+    """Normalize a ``progress`` parameter for :meth:`Table.add`.
+
+    Returns ``(progress_obj, owns)`` where *owns* is True when we created a
+    tqdm bar that the caller must close.
+    """
+    if progress is True:
+        from tqdm.auto import tqdm
+
+        return tqdm(unit=" rows"), True
+    if progress is False or progress is None:
+        return None, False
+    return progress, False
+
+
 class Table(ABC):
     """
     A Table is a collection of Records in a LanceDB Database.
@@ -974,6 +990,7 @@ class Table(ABC):
         mode: AddMode = "append",
         on_bad_vectors: OnBadVectorsType = "error",
         fill_value: float = 0.0,
+        progress: Optional[Union[bool, Callable, Any]] = None,
     ) -> AddResult:
         """Add more data to the [Table](Table).
 
@@ -995,6 +1012,29 @@ class Table(ABC):
             One of "error", "drop", "fill".
         fill_value: float, default 0.
             The value to use when filling vectors. Only used if on_bad_vectors="fill".
+        progress: bool, callable, or tqdm-like, optional
+            Progress reporting during the add operation. Can be:
+
+            - ``True`` to automatically create and display a tqdm progress
+              bar (requires ``tqdm`` to be installed)::
+
+                table.add(data, progress=True)
+
+            - A **callable** that receives a dict with keys ``output_rows``,
+              ``output_bytes``, ``total_rows``, ``elapsed_seconds``,
+              ``active_tasks``, ``total_tasks``, and ``done``::
+
+                def on_progress(p):
+                    print(f"{p['output_rows']}/{p['total_rows']} rows, "
+                          f"{p['active_tasks']}/{p['total_tasks']} workers")
+                table.add(data, progress=on_progress)
+
+            - A **tqdm-compatible** progress bar whose ``total`` and
+              ``update()`` will be called automatically. The postfix shows
+              write throughput (MB/s) and active worker count::
+
+                with tqdm() as pbar:
+                    table.add(data, progress=pbar)
 
         Returns
         -------
@@ -2492,6 +2532,7 @@ class LanceTable(Table):
         mode: AddMode = "append",
         on_bad_vectors: OnBadVectorsType = "error",
         fill_value: float = 0.0,
+        progress: Optional[Union[bool, Callable, Any]] = None,
     ) -> AddResult:
         """Add data to the table.
         If vector columns are missing and the table
@@ -2510,17 +2551,29 @@ class LanceTable(Table):
             One of "error", "drop", "fill", "null".
         fill_value: float, default 0.
             The value to use when filling vectors. Only used if on_bad_vectors="fill".
+        progress: bool, callable, or tqdm-like, optional
+            A callback or tqdm-compatible progress bar. See
+            :meth:`Table.add` for details.
 
         Returns
         -------
         int
             The number of vectors in the table.
         """
-        return LOOP.run(
+        progress, owns = _normalize_progress(progress)
-            self._table.add(
+        try:
-                data, mode=mode, on_bad_vectors=on_bad_vectors, fill_value=fill_value
+            return LOOP.run(
+                self._table.add(
+                    data,
+                    mode=mode,
+                    on_bad_vectors=on_bad_vectors,
+                    fill_value=fill_value,
+                    progress=progress,
+                )
             )
-        )
+        finally:
+            if owns:
+                progress.close()
 
     def merge(
         self,
@@ -3769,6 +3822,7 @@ class AsyncTable:
         mode: Optional[Literal["append", "overwrite"]] = "append",
         on_bad_vectors: Optional[OnBadVectorsType] = None,
         fill_value: Optional[float] = None,
+        progress: Optional[Union[bool, Callable, Any]] = None,
     ) -> AddResult:
         """Add more data to the [Table](Table).
 
@@ -3790,6 +3844,9 @@ class AsyncTable:
             One of "error", "drop", "fill", "null".
         fill_value: float, default 0.
             The value to use when filling vectors. Only used if on_bad_vectors="fill".
+        progress: callable or tqdm-like, optional
+            A callback or tqdm-compatible progress bar. See
+            :meth:`Table.add` for details.
 
         """
         schema = await self.schema()
@@ -3813,8 +3870,9 @@ class AsyncTable:
             )
         _register_optional_converters()
         data = to_scannable(data)
+        progress, owns = _normalize_progress(progress)
         try:
-            return await self._inner.add(data, mode or "append")
+            return await self._inner.add(data, mode or "append", progress=progress)
         except RuntimeError as e:
             if "Cast error" in str(e):
                 raise ValueError(e)
@@ -3822,6 +3880,9 @@ class AsyncTable:
                 raise ValueError(e)
             else:
                 raise
+        finally:
+            if owns:
+                progress.close()
 
     def merge_insert(self, on: Union[str, Iterable[str]]) -> LanceMergeInsertBuilder:
         """
@@ -4751,7 +4812,16 @@ class IndexStatistics:
     num_indexed_rows: int
     num_unindexed_rows: int
     index_type: Literal[
-        "IVF_PQ", "IVF_HNSW_PQ", "IVF_HNSW_SQ", "FTS", "BTREE", "BITMAP", "LABEL_LIST"
+        "IVF_FLAT",
+        "IVF_SQ",
+        "IVF_PQ",
+        "IVF_RQ",
+        "IVF_HNSW_SQ",
+        "IVF_HNSW_PQ",
+        "FTS",
+        "BTREE",
+        "BITMAP",
+        "LABEL_LIST",
     ]
     distance_type: Optional[Literal["l2", "cosine", "dot"]] = None
     num_indices: Optional[int] = None

python/python/tests/test_index.py

@@ -3,6 +3,7 @@
 
 from datetime import timedelta
 import random
+from typing import get_args, get_type_hints
 
 import pyarrow as pa
 import pytest
@@ -22,6 +23,7 @@ from lancedb.index import (
     HnswSq,
     FTS,
 )
+from lancedb.table import IndexStatistics
 
 
 @pytest_asyncio.fixture
@@ -283,3 +285,23 @@ async def test_create_index_with_binary_vectors(binary_table: AsyncTable):
     for v in range(256):
         res = await binary_table.query().nearest_to([v] * 128).to_arrow()
         assert res["id"][0].as_py() == v
+
+
+def test_index_statistics_index_type_lists_all_supported_values():
+    expected_index_types = {
+        "IVF_FLAT",
+        "IVF_SQ",
+        "IVF_PQ",
+        "IVF_RQ",
+        "IVF_HNSW_SQ",
+        "IVF_HNSW_PQ",
+        "FTS",
+        "BTREE",
+        "BITMAP",
+        "LABEL_LIST",
+    }
+
+    assert (
+        set(get_args(get_type_hints(IndexStatistics)["index_type"]))
+        == expected_index_types
+    )

python/python/tests/test_table.py

@@ -527,6 +527,102 @@ async def test_add_async(mem_db_async: AsyncConnection):
     assert await table.count_rows() == 3
 
 
+def test_add_progress_callback(mem_db: DBConnection):
+    table = mem_db.create_table(
+        "test",
+        data=[{"id": 1}, {"id": 2}],
+    )
+
+    updates = []
+    table.add([{"id": 3}, {"id": 4}], progress=lambda p: updates.append(dict(p)))
+
+    assert len(table) == 4
+    # The done callback always fires, so we should always get at least one.
+    assert len(updates) >= 1, "expected at least one progress callback"
+    for p in updates:
+        assert "output_rows" in p
+        assert "output_bytes" in p
+        assert "total_rows" in p
+        assert "elapsed_seconds" in p
+        assert "active_tasks" in p
+        assert "total_tasks" in p
+        assert "done" in p
+    # The last callback should have done=True.
+    assert updates[-1]["done"] is True
+
+
+def test_add_progress_tqdm_like(mem_db: DBConnection):
+    """Test that a tqdm-like object gets total set and update() called."""
+
+    class FakeBar:
+        def __init__(self):
+            self.total = None
+            self.n = 0
+            self.postfix = None
+
+        def update(self, n):
+            self.n += n
+
+        def set_postfix_str(self, s):
+            self.postfix = s
+
+        def refresh(self):
+            pass
+
+    table = mem_db.create_table(
+        "test",
+        data=[{"id": 1}, {"id": 2}],
+    )
+
+    bar = FakeBar()
+    table.add([{"id": 3}, {"id": 4}], progress=bar)
+
+    assert len(table) == 4
+    # Postfix should contain throughput and worker count
+    if bar.postfix is not None:
+        assert "MB/s" in bar.postfix
+        assert "workers" in bar.postfix
+
+
+def test_add_progress_bool(mem_db: DBConnection):
+    """Test that progress=True creates and closes a tqdm bar automatically."""
+    table = mem_db.create_table(
+        "test",
+        data=[{"id": 1}, {"id": 2}],
+    )
+
+    table.add([{"id": 3}, {"id": 4}], progress=True)
+    assert len(table) == 4
+
+    # progress=False should be the same as None
+    table.add([{"id": 5}], progress=False)
+    assert len(table) == 5
+
+
+@pytest.mark.asyncio
+async def test_add_progress_callback_async(mem_db_async: AsyncConnection):
+    """Progress callbacks work through the async path too."""
+    table = await mem_db_async.create_table("test", data=[{"id": 1}, {"id": 2}])
+
+    updates = []
+    await table.add([{"id": 3}, {"id": 4}], progress=lambda p: updates.append(dict(p)))
+
+    assert await table.count_rows() == 4
+    assert len(updates) >= 1
+    assert updates[-1]["done"] is True
+
+
+def test_add_progress_callback_error(mem_db: DBConnection):
+    """A failing callback must not prevent the write from succeeding."""
+    table = mem_db.create_table("test", data=[{"id": 1}, {"id": 2}])
+
+    def bad_callback(p):
+        raise RuntimeError("boom")
+
+    table.add([{"id": 3}, {"id": 4}], progress=bad_callback)
+    assert len(table) == 4
+
+
 def test_polars(mem_db: DBConnection):
     data = {
         "vector": [[3.1, 4.1], [5.9, 26.5]],

python/src/table.rs

@@ -19,7 +19,7 @@ use lancedb::table::{
     Table as LanceDbTable,
 };
 use pyo3::{
-    Bound, FromPyObject, PyAny, PyRef, PyResult, Python,
+    Bound, FromPyObject, Py, PyAny, PyRef, PyResult, Python,
     exceptions::{PyKeyError, PyRuntimeError, PyValueError},
     pyclass, pymethods,
     types::{IntoPyDict, PyAnyMethods, PyDict, PyDictMethods},
@@ -299,10 +299,12 @@ impl Table {
         })
     }
 
+    #[pyo3(signature = (data, mode, progress=None))]
     pub fn add<'a>(
         self_: PyRef<'a, Self>,
         data: PyScannable,
         mode: String,
+        progress: Option<Py<PyAny>>,
     ) -> PyResult<Bound<'a, PyAny>> {
         let mut op = self_.inner_ref()?.add(data);
         if mode == "append" {
@@ -312,6 +314,81 @@ impl Table {
         } else {
             return Err(PyValueError::new_err(format!("Invalid mode: {}", mode)));
         }
+        if let Some(progress_obj) = progress {
+            let is_callable = Python::attach(|py| progress_obj.bind(py).is_callable());
+            if is_callable {
+                // Callback: call with a dict of progress info.
+                op = op.progress(move |p| {
+                    Python::attach(|py| {
+                        let dict = PyDict::new(py);
+                        if let Err(e) = dict
+                            .set_item("output_rows", p.output_rows())
+                            .and_then(|_| dict.set_item("output_bytes", p.output_bytes()))
+                            .and_then(|_| dict.set_item("total_rows", p.total_rows()))
+                            .and_then(|_| {
+                                dict.set_item("elapsed_seconds", p.elapsed().as_secs_f64())
+                            })
+                            .and_then(|_| dict.set_item("active_tasks", p.active_tasks()))
+                            .and_then(|_| dict.set_item("total_tasks", p.total_tasks()))
+                            .and_then(|_| dict.set_item("done", p.done()))
+                        {
+                            log::warn!("progress dict error: {e}");
+                            return;
+                        }
+                        if let Err(e) = progress_obj.call1(py, (dict,)) {
+                            log::warn!("progress callback error: {e}");
+                        }
+                    });
+                });
+            } else {
+                // tqdm-like: has update() method.
+                let mut last_rows: usize = 0;
+                let mut total_set = false;
+                op = op.progress(move |p| {
+                    let current = p.output_rows();
+                    let prev = last_rows;
+                    last_rows = current;
+                    Python::attach(|py| {
+                        if let Some(total) = p.total_rows()
+                            && !total_set
+                        {
+                            if let Err(e) = progress_obj.setattr(py, "total", total) {
+                                log::warn!("progress setattr error: {e}");
+                            }
+                            total_set = true;
+                        }
+                        let delta = current.saturating_sub(prev);
+                        if delta > 0 {
+                            if let Err(e) = progress_obj.call_method1(py, "update", (delta,)) {
+                                log::warn!("progress update error: {e}");
+                            }
+                            // Show throughput and active workers in tqdm postfix.
+                            let elapsed = p.elapsed().as_secs_f64();
+                            if elapsed > 0.0 {
+                                let mb_per_sec = p.output_bytes() as f64 / elapsed / 1_000_000.0;
+                                let postfix = format!(
+                                    "{:.1} MB/s | {}/{} workers",
+                                    mb_per_sec,
+                                    p.active_tasks(),
+                                    p.total_tasks()
+                                );
+                                if let Err(e) =
+                                    progress_obj.call_method1(py, "set_postfix_str", (postfix,))
+                                {
+                                    log::warn!("progress set_postfix_str error: {e}");
+                                }
+                            }
+                        }
+                        if p.done() {
+                            // Force a final refresh so the bar shows completion.
+                            if let Err(e) = progress_obj.call_method0(py, "refresh") {
+                                log::warn!("progress refresh error: {e}");
+                            }
+                        }
+                    });
+                });
+            }
+        }
 
         future_into_py(self_.py(), async move {
             let result = op.execute().await.infer_error()?;

rust/lancedb/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lancedb"
-version = "0.27.0"
+version = "0.27.2-beta.0"
 edition.workspace = true
 description = "LanceDB: A serverless, low-latency vector database for AI applications"
 license.workspace = true

rust/lancedb/src/connection.rs

@@ -596,11 +596,8 @@ pub struct ConnectBuilder {
 }
 
 #[cfg(feature = "remote")]
-const ENV_VARS_TO_STORAGE_OPTS: [(&str, &str); 3] = [
+const ENV_VARS_TO_STORAGE_OPTS: [(&str, &str); 1] =
-    ("AZURE_STORAGE_ACCOUNT_NAME", "azure_storage_account_name"),
+    [("AZURE_STORAGE_ACCOUNT_NAME", "azure_storage_account_name")];
-    ("AZURE_CLIENT_ID", "azure_client_id"),
-    ("AZURE_TENANT_ID", "azure_tenant_id"),
-];
 
 impl ConnectBuilder {
     /// Create a new [`ConnectOptions`] with the given database URI.

rust/lancedb/src/remote/client.rs

@@ -443,23 +443,13 @@ impl<S: HttpSend> RestfulLanceDbClient<S> {
                 })?,
             );
         }
-        // Map azure storage options to x-azure-* headers.
+        if let Some(v) = options.0.get("azure_storage_account_name") {
-        // The option key uses underscores (e.g. "azure_client_id") while the
+            headers.insert(
-        // header uses hyphens (e.g. "x-azure-client-id").
+                HeaderName::from_static("x-azure-storage-account-name"),
-        let azure_opts: [(&str, &str); 3] = [
+                HeaderValue::from_str(v).map_err(|_| Error::InvalidInput {
-            ("azure_storage_account_name", "x-azure-storage-account-name"),
+                    message: format!("non-ascii storage account name '{}' provided", db_name),
-            ("azure_client_id", "x-azure-client-id"),
+                })?,
-            ("azure_tenant_id", "x-azure-tenant-id"),
+            );
-        ];
-        for (opt_key, header_name) in azure_opts {
-            if let Some(v) = options.0.get(opt_key) {
-                headers.insert(
-                    HeaderName::from_static(header_name),
-                    HeaderValue::from_str(v).map_err(|_| Error::InvalidInput {
-                        message: format!("non-ascii value '{}' for option '{}'", v, opt_key),
-                    })?,
-                );
-            }
         }
 
         for (key, value) in &config.extra_headers {
@@ -1082,34 +1072,4 @@ mod tests {
             _ => panic!("Expected Runtime error"),
         }
     }
-
-    #[test]
-    fn test_default_headers_azure_opts() {
-        let mut opts = HashMap::new();
-        opts.insert(
-            "azure_storage_account_name".to_string(),
-            "myaccount".to_string(),
-        );
-        opts.insert("azure_client_id".to_string(), "my-client-id".to_string());
-        opts.insert("azure_tenant_id".to_string(), "my-tenant-id".to_string());
-        let remote_opts = RemoteOptions::new(opts);
-
-        let headers = RestfulLanceDbClient::<Sender>::default_headers(
-            "test-key",
-            "us-east-1",
-            "testdb",
-            false,
-            &remote_opts,
-            None,
-            &ClientConfig::default(),
-        )
-        .unwrap();
-
-        assert_eq!(
-            headers.get("x-azure-storage-account-name").unwrap(),
-            "myaccount"
-        );
-        assert_eq!(headers.get("x-azure-client-id").unwrap(), "my-client-id");
-        assert_eq!(headers.get("x-azure-tenant-id").unwrap(), "my-tenant-id");
-    }
 }

rust/lancedb/src/remote/db.rs

@@ -72,6 +72,10 @@ impl ServerVersion {
     pub fn support_structural_fts(&self) -> bool {
         self.0 >= semver::Version::new(0, 3, 0)
     }
+
+    pub fn support_multipart_write(&self) -> bool {
+        self.0 >= semver::Version::new(0, 4, 0)
+    }
 }
 
 pub const OPT_REMOTE_PREFIX: &str = "remote_database_";
@@ -778,12 +782,7 @@ impl RemoteOptions {
 
 impl From<StorageOptions> for RemoteOptions {
     fn from(options: StorageOptions) -> Self {
-        let supported_opts = vec![
+        let supported_opts = vec!["account_name", "azure_storage_account_name"];
-            "account_name",
-            "azure_storage_account_name",
-            "azure_client_id",
-            "azure_tenant_id",
-        ];
         let mut filtered = HashMap::new();
         for opt in supported_opts {
             if let Some(v) = options.0.get(opt) {

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

@@ -11,10 +11,14 @@ use arrow_ipc::CompressionType;
 use datafusion_common::{DataFusionError, Result as DataFusionResult};
 use datafusion_execution::{SendableRecordBatchStream, TaskContext};
 use datafusion_physical_expr::EquivalenceProperties;
+use datafusion_physical_plan::metrics::{ExecutionPlanMetricsSet, MetricsSet};
 use datafusion_physical_plan::stream::RecordBatchStreamAdapter;
-use datafusion_physical_plan::{DisplayAs, DisplayFormatType, ExecutionPlan, PlanProperties};
+use datafusion_physical_plan::{
+    DisplayAs, DisplayFormatType, ExecutionPlan, ExecutionPlanProperties, PlanProperties,
+};
 use futures::StreamExt;
 use http::header::CONTENT_TYPE;
+use lance::io::exec::utils::InstrumentedRecordBatchStreamAdapter;
 
 use crate::Error;
 use crate::remote::ARROW_STREAM_CONTENT_TYPE;
@@ -22,13 +26,16 @@ use crate::remote::client::{HttpSend, RestfulLanceDbClient, Sender};
 use crate::remote::table::RemoteTable;
 use crate::table::AddResult;
 use crate::table::datafusion::insert::COUNT_SCHEMA;
+use crate::table::write_progress::WriteProgressTracker;
 
 /// ExecutionPlan for inserting data into a remote LanceDB table.
 ///
-/// This plan:
+/// Streams data as Arrow IPC to `/v1/table/{id}/insert/` endpoint.
-/// 1. Requires single partition (no parallel remote inserts yet)
+///
-/// 2. Streams data as Arrow IPC to `/v1/table/{id}/insert/` endpoint
+/// When `upload_id` is set, inserts are staged as part of a multipart write
-/// 3. Stores AddResult for retrieval after execution
+/// session and the plan supports multiple partitions for parallel uploads.
+/// Without `upload_id`, the plan requires a single partition and commits
+/// immediately.
 #[derive(Debug)]
 pub struct RemoteInsertExec<S: HttpSend = Sender> {
     table_name: String,
@@ -38,21 +45,69 @@ pub struct RemoteInsertExec<S: HttpSend = Sender> {
     overwrite: bool,
     properties: PlanProperties,
     add_result: Arc<Mutex<Option<AddResult>>>,
+    metrics: ExecutionPlanMetricsSet,
+    upload_id: Option<String>,
+    tracker: Option<Arc<WriteProgressTracker>>,
 }
 
 impl<S: HttpSend + 'static> RemoteInsertExec<S> {
-    /// Create a new RemoteInsertExec.
+    /// Create a new single-partition RemoteInsertExec.
     pub fn new(
         table_name: String,
         identifier: String,
         client: RestfulLanceDbClient<S>,
         input: Arc<dyn ExecutionPlan>,
         overwrite: bool,
+        tracker: Option<Arc<WriteProgressTracker>>,
     ) -> Self {
+        Self::new_inner(
+            table_name, identifier, client, input, overwrite, None, tracker,
+        )
+    }
+
+    /// Create a multi-partition RemoteInsertExec for use with multipart writes.
+    ///
+    /// Each partition's insert is staged under the given `upload_id` without
+    /// committing. The caller is responsible for calling the complete (or abort)
+    /// endpoint after all partitions finish.
+    pub fn new_multipart(
+        table_name: String,
+        identifier: String,
+        client: RestfulLanceDbClient<S>,
+        input: Arc<dyn ExecutionPlan>,
+        overwrite: bool,
+        upload_id: String,
+        tracker: Option<Arc<WriteProgressTracker>>,
+    ) -> Self {
+        Self::new_inner(
+            table_name,
+            identifier,
+            client,
+            input,
+            overwrite,
+            Some(upload_id),
+            tracker,
+        )
+    }
+
+    fn new_inner(
+        table_name: String,
+        identifier: String,
+        client: RestfulLanceDbClient<S>,
+        input: Arc<dyn ExecutionPlan>,
+        overwrite: bool,
+        upload_id: Option<String>,
+        tracker: Option<Arc<WriteProgressTracker>>,
+    ) -> Self {
+        let num_partitions = if upload_id.is_some() {
+            input.output_partitioning().partition_count()
+        } else {
+            1
+        };
         let schema = COUNT_SCHEMA.clone();
         let properties = PlanProperties::new(
             EquivalenceProperties::new(schema),
-            datafusion_physical_plan::Partitioning::UnknownPartitioning(1),
+            datafusion_physical_plan::Partitioning::UnknownPartitioning(num_partitions),
             datafusion_physical_plan::execution_plan::EmissionType::Final,
             datafusion_physical_plan::execution_plan::Boundedness::Bounded,
         );
@@ -65,6 +120,9 @@ impl<S: HttpSend + 'static> RemoteInsertExec<S> {
             overwrite,
             properties,
             add_result: Arc::new(Mutex::new(None)),
+            metrics: ExecutionPlanMetricsSet::new(),
+            upload_id,
+            tracker,
         }
     }
 
@@ -83,6 +141,7 @@ impl<S: HttpSend + 'static> RemoteInsertExec<S> {
     fn stream_as_http_body(
         data: SendableRecordBatchStream,
         error_tx: tokio::sync::oneshot::Sender<DataFusionError>,
+        tracker: Option<Arc<WriteProgressTracker>>,
     ) -> DataFusionResult<reqwest::Body> {
         let options = arrow_ipc::writer::IpcWriteOptions::default()
             .try_with_compression(Some(CompressionType::LZ4_FRAME))?;
@@ -94,37 +153,46 @@ impl<S: HttpSend + 'static> RemoteInsertExec<S> {
 
         let stream = futures::stream::try_unfold(
             (data, writer, Some(error_tx), false),
-            move |(mut data, mut writer, error_tx, finished)| async move {
+            move |(mut data, mut writer, error_tx, finished)| {
-                if finished {
+                let tracker = tracker.clone();
-                    return Ok(None);
+                async move {
-                }
+                    if finished {
-                match data.next().await {
+                        return Ok(None);
-                    Some(Ok(batch)) => {
-                        writer
-                            .write(&batch)
-                            .map_err(|e| std::io::Error::other(e.to_string()))?;
-                        let buffer = std::mem::take(writer.get_mut());
-                        Ok(Some((buffer, (data, writer, error_tx, false))))
                     }
-                    Some(Err(e)) => {
+                    match data.next().await {
-                        // Send the original error through the channel before
+                        Some(Ok(batch)) => {
-                        // returning a generic error to reqwest.
+                            writer
-                        if let Some(tx) = error_tx {
+                                .write(&batch)
-                            let _ = tx.send(e);
+                                .map_err(|e| std::io::Error::other(e.to_string()))?;
+                            let buffer = std::mem::take(writer.get_mut());
+                            if let Some(ref t) = tracker {
+                                t.record_bytes(buffer.len());
+                            }
+                            Ok(Some((buffer, (data, writer, error_tx, false))))
                         }
-                        Err(std::io::Error::other(
+                        Some(Err(e)) => {
-                            "input stream error (see error channel)",
+                            // Send the original error through the channel before
-                        ))
+                            // returning a generic error to reqwest.
-                    }
+                            if let Some(tx) = error_tx {
-                    None => {
+                                let _ = tx.send(e);
-                        writer
+                            }
-                            .finish()
+                            Err(std::io::Error::other(
-                            .map_err(|e| std::io::Error::other(e.to_string()))?;
+                                "input stream error (see error channel)",
-                        let buffer = std::mem::take(writer.get_mut());
+                            ))
-                        if buffer.is_empty() {
+                        }
-                            Ok(None)
+                        None => {
-                        } else {
+                            writer
-                            Ok(Some((buffer, (data, writer, None, true))))
+                                .finish()
+                                .map_err(|e| std::io::Error::other(e.to_string()))?;
+                            let buffer = std::mem::take(writer.get_mut());
+                            if buffer.is_empty() {
+                                Ok(None)
+                            } else {
+                                if let Some(ref t) = tracker {
+                                    t.record_bytes(buffer.len());
+                                }
+                                Ok(Some((buffer, (data, writer, None, true))))
+                            }
                         }
                     }
                 }
@@ -174,8 +242,11 @@ impl<S: HttpSend + 'static> ExecutionPlan for RemoteInsertExec<S> {
     }
 
     fn required_input_distribution(&self) -> Vec<datafusion_physical_plan::Distribution> {
-        // Until we have a separate commit endpoint, we need to do all inserts in a single partition
+        if self.upload_id.is_some() {
-        vec![datafusion_physical_plan::Distribution::SinglePartition]
+            vec![datafusion_physical_plan::Distribution::UnspecifiedDistribution]
+        } else {
+            vec![datafusion_physical_plan::Distribution::SinglePartition]
+        }
     }
 
     fn benefits_from_input_partitioning(&self) -> Vec<bool> {
@@ -191,12 +262,14 @@ impl<S: HttpSend + 'static> ExecutionPlan for RemoteInsertExec<S> {
                 "RemoteInsertExec requires exactly one child".to_string(),
             ));
         }
-        Ok(Arc::new(Self::new(
+        Ok(Arc::new(Self::new_inner(
             self.table_name.clone(),
             self.identifier.clone(),
             self.client.clone(),
             children[0].clone(),
             self.overwrite,
+            self.upload_id.clone(),
+            self.tracker.clone(),
         )))
     }
 
@@ -205,18 +278,29 @@ impl<S: HttpSend + 'static> ExecutionPlan for RemoteInsertExec<S> {
         partition: usize,
         context: Arc<TaskContext>,
     ) -> DataFusionResult<SendableRecordBatchStream> {
-        if partition != 0 {
+        if self.upload_id.is_none() && partition != 0 {
             return Err(DataFusionError::Internal(
-                "RemoteInsertExec only supports single partition execution".to_string(),
+                "RemoteInsertExec only supports single partition execution without upload_id"
+                    .to_string(),
             ));
         }
 
-        let input_stream = self.input.execute(0, context)?;
+        let input_stream = self.input.execute(partition, context)?;
+        let input_schema = input_stream.schema();
+        let input_stream: SendableRecordBatchStream =
+            Box::pin(InstrumentedRecordBatchStreamAdapter::new(
+                input_schema,
+                input_stream,
+                partition,
+                &self.metrics,
+            ));
         let client = self.client.clone();
         let identifier = self.identifier.clone();
         let overwrite = self.overwrite;
         let add_result = self.add_result.clone();
         let table_name = self.table_name.clone();
+        let upload_id = self.upload_id.clone();
+        let tracker = self.tracker.clone();
 
         let stream = futures::stream::once(async move {
             let mut request = client
@@ -226,9 +310,12 @@ impl<S: HttpSend + 'static> ExecutionPlan for RemoteInsertExec<S> {
             if overwrite {
                 request = request.query(&[("mode", "overwrite")]);
             }
+            if let Some(ref uid) = upload_id {
+                request = request.query(&[("upload_id", uid.as_str())]);
+            }
 
             let (error_tx, mut error_rx) = tokio::sync::oneshot::channel();
-            let body = Self::stream_as_http_body(input_stream, error_tx)?;
+            let body = Self::stream_as_http_body(input_stream, error_tx, tracker)?;
             let request = request.body(body);
 
             let result: DataFusionResult<(String, _)> = async {
@@ -262,32 +349,43 @@ impl<S: HttpSend + 'static> ExecutionPlan for RemoteInsertExec<S> {
 
             let (request_id, response) = result?;
 
-            let body_text = response.text().await.map_err(|e| {
+            // For multipart writes, the staging response is not the final
-                DataFusionError::External(Box::new(Error::Http {
+            // version. Only parse AddResult for non-multipart inserts.
-                    source: Box::new(e),
+            if upload_id.is_none() {
-                    request_id: request_id.clone(),
+                let body_text = response.text().await.map_err(|e| {
-                    status_code: None,
-                }))
-            })?;
-
-            let parsed_result = if body_text.trim().is_empty() {
-                // Backward compatible with old servers
-                AddResult { version: 0 }
-            } else {
-                serde_json::from_str(&body_text).map_err(|e| {
                     DataFusionError::External(Box::new(Error::Http {
-                        source: format!("Failed to parse add response: {}", e).into(),
+                        source: Box::new(e),
                         request_id: request_id.clone(),
                         status_code: None,
                     }))
-                })?
+                })?;
-            };
+
+                let parsed_result = if body_text.trim().is_empty() {
+                    // Backward compatible with old servers
+                    AddResult { version: 0 }
+                } else {
+                    serde_json::from_str(&body_text).map_err(|e| {
+                        DataFusionError::External(Box::new(Error::Http {
+                            source: format!("Failed to parse add response: {}", e).into(),
+                            request_id: request_id.clone(),
+                            status_code: None,
+                        }))
+                    })?
+                };
 
-            {
                 let mut res_lock = add_result.lock().map_err(|_| {
                     DataFusionError::Execution("Failed to acquire lock for add_result".to_string())
                 })?;
                 *res_lock = Some(parsed_result);
+            } else {
+                // We don't use the body in this case, but we should still consume it.
+                let _ = response.bytes().await.map_err(|e| {
+                    DataFusionError::External(Box::new(Error::Http {
+                        source: Box::new(e),
+                        request_id: request_id.clone(),
+                        status_code: None,
+                    }))
+                })?;
             }
 
             // Return a single batch with count 0 (actual count is tracked in add_result)
@@ -301,6 +399,10 @@ impl<S: HttpSend + 'static> ExecutionPlan for RemoteInsertExec<S> {
             stream,
         )))
     }
+
+    fn metrics(&self) -> Option<MetricsSet> {
+        Some(self.metrics.clone_inner())
+    }
 }
 
 #[cfg(test)]

rust/lancedb/src/table.rs

@@ -74,7 +74,10 @@ pub mod optimize;
 pub mod query;
 pub mod schema_evolution;
 pub mod update;
+pub mod write_progress;
 use crate::index::waiter::wait_for_index;
+#[cfg(feature = "remote")]
+pub(crate) use add_data::PreprocessingOutput;
 pub use add_data::{AddDataBuilder, AddDataMode, AddResult, NaNVectorBehavior};
 pub use chrono::Duration;
 pub use delete::DeleteResult;
@@ -440,6 +443,34 @@ mod test_utils {
                 embedding_registry: Arc::new(MemoryRegistry::new()),
             }
         }
+
+        pub fn new_with_handler_version_and_config<T>(
+            name: impl Into<String>,
+            version: semver::Version,
+            handler: impl Fn(reqwest::Request) -> http::Response<T> + Clone + Send + Sync + 'static,
+            config: crate::remote::ClientConfig,
+        ) -> Self
+        where
+            T: Into<reqwest::Body>,
+        {
+            let inner = Arc::new(
+                crate::remote::table::RemoteTable::new_mock_with_version_and_config(
+                    name.into(),
+                    handler.clone(),
+                    Some(version),
+                    config.clone(),
+                ),
+            );
+            let database = Arc::new(crate::remote::db::RemoteDatabase::new_mock_with_config(
+                handler, config,
+            ));
+            Self {
+                inner,
+                database: Some(database),
+                // Registry is unused.
+                embedding_registry: Arc::new(MemoryRegistry::new()),
+            }
+        }
     }
 }
 
@@ -2198,21 +2229,26 @@ impl BaseTable for NativeTable {
 
         let table_schema = Schema::from(&ds.schema().clone());
 
-        // Peek at the first batch to estimate a good partition count for
+        let num_partitions = if let Some(parallelism) = add.write_parallelism {
-        // write parallelism.
+            parallelism
-        let mut peeked = PeekedScannable::new(add.data);
-        let num_partitions = if let Some(first_batch) = peeked.peek().await {
-            let max_partitions = lance_core::utils::tokio::get_num_compute_intensive_cpus();
-            estimate_write_partitions(
-                first_batch.get_array_memory_size(),
-                first_batch.num_rows(),
-                peeked.num_rows(),
-                max_partitions,
-            )
         } else {
-            1
+            // Peek at the first batch to estimate a good partition count for
+            // write parallelism.
+            let mut peeked = PeekedScannable::new(add.data);
+            let n = if let Some(first_batch) = peeked.peek().await {
+                let max_partitions = lance_core::utils::tokio::get_num_compute_intensive_cpus();
+                estimate_write_partitions(
+                    first_batch.get_array_memory_size(),
+                    first_batch.num_rows(),
+                    peeked.num_rows(),
+                    max_partitions,
+                )
+            } else {
+                1
+            };
+            add.data = Box::new(peeked);
+            n
         };
-        add.data = Box::new(peeked);
 
         let output = add.into_plan(&table_schema, &table_def)?;
 
@@ -2241,13 +2277,21 @@ impl BaseTable for NativeTable {
 
         let insert_exec = Arc::new(InsertExec::new(ds_wrapper.clone(), ds, plan, lance_params));
 
+        let tracker_for_tasks = output.tracker.clone();
+        if let Some(ref t) = tracker_for_tasks {
+            t.set_total_tasks(num_partitions);
+        }
+        let _finish = write_progress::FinishOnDrop(output.tracker);
+
         // Execute all partitions in parallel.
         let task_ctx = Arc::new(TaskContext::default());
         let handles = FuturesUnordered::new();
         for partition in 0..num_partitions {
             let exec = insert_exec.clone();
             let ctx = task_ctx.clone();
+            let tracker = tracker_for_tasks.clone();
             handles.push(tokio::spawn(async move {
+                let _guard = tracker.as_ref().map(|t| t.track_task());
                 let mut stream = exec
                     .execute(partition, ctx)
                     .map_err(|e| -> Error { e.into() })?;

rust/lancedb/src/table/add_data.rs

@@ -13,6 +13,9 @@ use crate::embeddings::EmbeddingRegistry;
 use crate::table::datafusion::cast::cast_to_table_schema;
 use crate::table::datafusion::reject_nan::reject_nan_vectors;
 use crate::table::datafusion::scannable_exec::ScannableExec;
+use crate::table::write_progress::ProgressCallback;
+use crate::table::write_progress::WriteProgress;
+use crate::table::write_progress::WriteProgressTracker;
 use crate::{Error, Result};
 
 use super::{BaseTable, TableDefinition, WriteOptions};
@@ -52,6 +55,8 @@ pub struct AddDataBuilder {
     pub(crate) write_options: WriteOptions,
     pub(crate) on_nan_vectors: NaNVectorBehavior,
     pub(crate) embedding_registry: Option<Arc<dyn EmbeddingRegistry>>,
+    pub(crate) progress_callback: Option<ProgressCallback>,
+    pub(crate) write_parallelism: Option<usize>,
 }
 
 impl std::fmt::Debug for AddDataBuilder {
@@ -77,6 +82,8 @@ impl AddDataBuilder {
             write_options: WriteOptions::default(),
             on_nan_vectors: NaNVectorBehavior::default(),
             embedding_registry,
+            progress_callback: None,
+            write_parallelism: None,
         }
     }
 
@@ -101,7 +108,43 @@ impl AddDataBuilder {
         self
     }
 
+    /// Set a callback to receive progress updates during the add operation.
+    ///
+    /// The callback is invoked once per batch written, and once more with
+    /// [`WriteProgress::done`] set to `true` when the write completes.
+    ///
+    /// ```
+    /// # use lancedb::Table;
+    /// # async fn example(table: &Table) -> Result<(), Box<dyn std::error::Error>> {
+    /// let batch = arrow_array::record_batch!(("id", Int32, [1, 2, 3])).unwrap();
+    /// table.add(batch)
+    ///     .progress(|p| println!("{}/{:?} rows", p.output_rows(), p.total_rows()))
+    ///     .execute()
+    ///     .await?;
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn progress(mut self, callback: impl FnMut(&WriteProgress) + Send + 'static) -> Self {
+        self.progress_callback = Some(Arc::new(std::sync::Mutex::new(callback)));
+        self
+    }
+
+    /// Set the number of parallel write streams.
+    ///
+    /// By default, the number of streams is estimated from the data size.
+    /// Setting this to `1` disables parallel writes.
+    pub fn write_parallelism(mut self, parallelism: usize) -> Self {
+        self.write_parallelism = Some(parallelism);
+        self
+    }
+
     pub async fn execute(self) -> Result<AddResult> {
+        if self.write_parallelism.map(|p| p == 0).unwrap_or(false) {
+            return Err(Error::InvalidInput {
+                message: "write_parallelism must be greater than 0".to_string(),
+            });
+        }
+
         self.parent.clone().add(self).await
     }
 
@@ -130,8 +173,11 @@ impl AddDataBuilder {
             scannable_with_embeddings(self.data, table_def, self.embedding_registry.as_ref())?;
 
         let rescannable = self.data.rescannable();
+        let tracker = self
+            .progress_callback
+            .map(|cb| Arc::new(WriteProgressTracker::new(cb, self.data.num_rows())));
         let plan: Arc<dyn datafusion_physical_plan::ExecutionPlan> =
-            Arc::new(ScannableExec::new(self.data));
+            Arc::new(ScannableExec::new(self.data, tracker.clone()));
         // Skip casting when overwriting — the input schema replaces the table schema.
         let plan = if overwrite {
             plan
@@ -149,6 +195,7 @@ impl AddDataBuilder {
             rescannable,
             write_options: self.write_options,
             mode: self.mode,
+            tracker,
         })
     }
 }
@@ -161,6 +208,7 @@ pub struct PreprocessingOutput {
     pub rescannable: bool,
     pub write_options: WriteOptions,
     pub mode: AddDataMode,
+    pub tracker: Option<Arc<WriteProgressTracker>>,
 }
 
 /// Check that the input schema is valid for insert.

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

@@ -12,13 +12,16 @@ use datafusion_common::{DataFusionError, Result as DataFusionResult};
 use datafusion_execution::{SendableRecordBatchStream, TaskContext};
 use datafusion_physical_expr::{EquivalenceProperties, Partitioning};
 use datafusion_physical_plan::execution_plan::{Boundedness, EmissionType};
+use datafusion_physical_plan::metrics::{ExecutionPlanMetricsSet, MetricBuilder, MetricsSet};
 use datafusion_physical_plan::stream::RecordBatchStreamAdapter;
 use datafusion_physical_plan::{
     DisplayAs, DisplayFormatType, ExecutionPlan, ExecutionPlanProperties, PlanProperties,
 };
+use futures::TryStreamExt;
 use lance::Dataset;
 use lance::dataset::transaction::{Operation, Transaction};
 use lance::dataset::{CommitBuilder, InsertBuilder, WriteParams};
+use lance::io::exec::utils::InstrumentedRecordBatchStreamAdapter;
 use lance_table::format::Fragment;
 
 use crate::table::dataset::DatasetConsistencyWrapper;
@@ -80,6 +83,7 @@ pub struct InsertExec {
     write_params: WriteParams,
     properties: PlanProperties,
     partial_transactions: Arc<Mutex<Vec<Transaction>>>,
+    metrics: ExecutionPlanMetricsSet,
 }
 
 impl InsertExec {
@@ -105,6 +109,7 @@ impl InsertExec {
             write_params,
             properties,
             partial_transactions: Arc::new(Mutex::new(Vec::with_capacity(num_partitions))),
+            metrics: ExecutionPlanMetricsSet::new(),
         }
     }
 }
@@ -176,6 +181,19 @@ impl ExecutionPlan for InsertExec {
         let total_partitions = self.input.output_partitioning().partition_count();
         let ds_wrapper = self.ds_wrapper.clone();
 
+        let output_bytes = MetricBuilder::new(&self.metrics).output_bytes(partition);
+        let input_schema = input_stream.schema();
+        let input_stream: SendableRecordBatchStream =
+            Box::pin(InstrumentedRecordBatchStreamAdapter::new(
+                input_schema,
+                input_stream.map_ok(move |batch| {
+                    output_bytes.add(batch.get_array_memory_size());
+                    batch
+                }),
+                partition,
+                &self.metrics,
+            ));
+
         let stream = futures::stream::once(async move {
             let transaction = InsertBuilder::new(dataset.clone())
                 .with_params(&write_params)
@@ -215,6 +233,10 @@ impl ExecutionPlan for InsertExec {
             stream,
         )))
     }
+
+    fn metrics(&self) -> Option<MetricsSet> {
+        Some(self.metrics.clone_inner())
+    }
 }
 
 #[cfg(test)]

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

@@ -7,17 +7,21 @@ use std::sync::{Arc, Mutex};
 use datafusion_common::{DataFusionError, Result as DFResult, Statistics, stats::Precision};
 use datafusion_execution::{SendableRecordBatchStream, TaskContext};
 use datafusion_physical_expr::{EquivalenceProperties, Partitioning};
+use datafusion_physical_plan::stream::RecordBatchStreamAdapter;
 use datafusion_physical_plan::{
     DisplayAs, DisplayFormatType, ExecutionPlan, PlanProperties, execution_plan::EmissionType,
 };
+use futures::TryStreamExt;
 
+use crate::table::write_progress::WriteProgressTracker;
 use crate::{arrow::SendableRecordBatchStreamExt, data::scannable::Scannable};
 
-pub struct ScannableExec {
+pub(crate) struct ScannableExec {
-    // We don't require Scannable to by Sync, so we wrap it in a Mutex to allow safe concurrent access.
+    // We don't require Scannable to be Sync, so we wrap it in a Mutex to allow safe concurrent access.
     source: Mutex<Box<dyn Scannable>>,
     num_rows: Option<usize>,
     properties: PlanProperties,
+    tracker: Option<Arc<WriteProgressTracker>>,
 }
 
 impl std::fmt::Debug for ScannableExec {
@@ -30,7 +34,7 @@ impl std::fmt::Debug for ScannableExec {
 }
 
 impl ScannableExec {
-    pub fn new(source: Box<dyn Scannable>) -> Self {
+    pub fn new(source: Box<dyn Scannable>, tracker: Option<Arc<WriteProgressTracker>>) -> Self {
         let schema = source.schema();
         let eq_properties = EquivalenceProperties::new(schema);
         let properties = PlanProperties::new(
@@ -46,6 +50,7 @@ impl ScannableExec {
             source,
             num_rows,
             properties,
+            tracker,
         }
     }
 }
@@ -102,7 +107,18 @@ impl ExecutionPlan for ScannableExec {
             Err(poison) => poison.into_inner().scan_as_stream(),
         };
 
-        Ok(stream.into_df_stream())
+        let tracker = self.tracker.clone();
+        let stream = stream.into_df_stream().map_ok(move |batch| {
+            if let Some(ref t) = tracker {
+                t.record_batch(batch.num_rows(), batch.get_array_memory_size());
+            }
+            batch
+        });
+
+        Ok(Box::pin(RecordBatchStreamAdapter::new(
+            self.schema(),
+            stream,
+        )))
     }
 
     fn partition_statistics(&self, _partition: Option<usize>) -> DFResult<Statistics> {

rust/lancedb/src/table/write_progress.rs

@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright The LanceDB Authors
+
+//! Progress monitoring for write operations.
+//!
+//! You can add a callback to process progress in [`crate::table::AddDataBuilder::progress`].
+//! [`WriteProgress`] is the struct passed to the callback.
+
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::{Arc, Mutex};
+use std::time::{Duration, Instant};
+
+/// Progress snapshot for a write operation.
+#[derive(Debug, Clone)]
+pub struct WriteProgress {
+    // These are private and only accessible via getters, to make it easy to add
+    // new fields without breaking existing callbacks.
+    elapsed: Duration,
+    output_rows: usize,
+    output_bytes: usize,
+    total_rows: Option<usize>,
+    active_tasks: usize,
+    total_tasks: usize,
+    done: bool,
+}
+
+impl WriteProgress {
+    /// Wall-clock time since monitoring started.
+    pub fn elapsed(&self) -> Duration {
+        self.elapsed
+    }
+
+    /// Number of rows written so far.
+    pub fn output_rows(&self) -> usize {
+        self.output_rows
+    }
+
+    /// Number of bytes written so far.
+    pub fn output_bytes(&self) -> usize {
+        self.output_bytes
+    }
+
+    /// Total rows expected.
+    ///
+    /// Populated when the input source reports a row count (e.g. a
+    /// [`arrow_array::RecordBatch`]).  Always `Some` when [`WriteProgress::done`]
+    /// is `true` — falling back to the actual number of rows written.
+    pub fn total_rows(&self) -> Option<usize> {
+        self.total_rows
+    }
+
+    /// Number of parallel write tasks currently in flight.
+    pub fn active_tasks(&self) -> usize {
+        self.active_tasks
+    }
+
+    /// Total number of parallel write tasks (i.e. the write parallelism).
+    pub fn total_tasks(&self) -> usize {
+        self.total_tasks
+    }
+
+    /// Whether the write operation has completed.
+    ///
+    /// The final callback always has `done = true`.  Callers can use this to
+    /// finalize progress bars or perform cleanup.
+    pub fn done(&self) -> bool {
+        self.done
+    }
+}
+
+/// Callback type for progress updates.
+///
+/// Callbacks are serialized by the tracker and are never invoked reentrantly,
+/// so `FnMut` is safe to use here.
+pub type ProgressCallback = Arc<Mutex<dyn FnMut(&WriteProgress) + Send>>;
+
+/// Tracks progress of a write operation and invokes a [`ProgressCallback`].
+///
+/// Call [`WriteProgressTracker::record_batch`] for each batch written.
+/// Call [`WriteProgressTracker::finish`] once after all data is written.
+///
+/// The callback is never invoked reentrantly: all state updates and callback
+/// invocations are serialized behind a single lock.
+impl std::fmt::Debug for WriteProgressTracker {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("WriteProgressTracker")
+            .field("total_rows", &self.total_rows)
+            .finish()
+    }
+}
+
+pub(crate) struct WriteProgressTracker {
+    rows_and_bytes: std::sync::Mutex<(usize, usize)>,
+    /// Wire bytes tracked separately by the insert layer. When set (> 0),
+    /// this takes precedence over the in-memory bytes from `rows_and_bytes`.
+    wire_bytes: AtomicUsize,
+    active_tasks: Arc<AtomicUsize>,
+    total_tasks: AtomicUsize,
+    start: Instant,
+    /// Known total rows from the input source, if available.
+    total_rows: Option<usize>,
+    callback: ProgressCallback,
+}
+
+impl WriteProgressTracker {
+    pub fn new(callback: ProgressCallback, total_rows: Option<usize>) -> Self {
+        Self {
+            rows_and_bytes: std::sync::Mutex::new((0, 0)),
+            wire_bytes: AtomicUsize::new(0),
+            active_tasks: Arc::new(AtomicUsize::new(0)),
+            total_tasks: AtomicUsize::new(1),
+            start: Instant::now(),
+            total_rows,
+            callback,
+        }
+    }
+
+    /// Set the total number of parallel write tasks (the write parallelism).
+    pub fn set_total_tasks(&self, n: usize) {
+        self.total_tasks.store(n, Ordering::Relaxed);
+    }
+
+    /// Increment the active task count. Returns a guard that decrements on drop.
+    pub fn track_task(&self) -> ActiveTaskGuard {
+        self.active_tasks.fetch_add(1, Ordering::Relaxed);
+        ActiveTaskGuard(self.active_tasks.clone())
+    }
+
+    /// Record a batch of rows passing through the scan node.
+    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();
+        guard.0 += rows;
+        guard.1 += bytes;
+        let progress = self.snapshot(guard.0, guard.1, false);
+        drop(guard);
+        cb(&progress);
+    }
+
+    /// Record wire bytes from the insert layer (e.g. IPC-encoded bytes for
+    /// remote writes). When wire bytes are recorded, they take precedence over
+    /// the in-memory Arrow bytes tracked by [`record_batch`].
+    pub fn record_bytes(&self, bytes: usize) {
+        self.wire_bytes.fetch_add(bytes, Ordering::Relaxed);
+    }
+
+    /// Emit the final progress callback indicating the write is complete.
+    ///
+    /// `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 snap = self.snapshot(guard.0, guard.1, true);
+        snap.total_rows = Some(self.total_rows.unwrap_or(guard.0));
+        drop(guard);
+        cb(&snap);
+    }
+
+    fn snapshot(&self, rows: usize, in_memory_bytes: usize, done: bool) -> WriteProgress {
+        let wire = self.wire_bytes.load(Ordering::Relaxed);
+        // Prefer wire bytes (actual I/O size) when the insert layer is
+        // tracking them; fall back to in-memory Arrow size otherwise.
+        // TODO: for local writes, track actual bytes written by Lance
+        // instead of using in-memory Arrow size as a proxy.
+        let output_bytes = if wire > 0 { wire } else { in_memory_bytes };
+        WriteProgress {
+            elapsed: self.start.elapsed(),
+            output_rows: rows,
+            output_bytes,
+            total_rows: self.total_rows,
+            active_tasks: self.active_tasks.load(Ordering::Relaxed),
+            total_tasks: self.total_tasks.load(Ordering::Relaxed),
+            done,
+        }
+    }
+}
+
+/// RAII guard that decrements the active task count when dropped.
+pub(crate) struct ActiveTaskGuard(Arc<AtomicUsize>);
+
+impl Drop for ActiveTaskGuard {
+    fn drop(&mut self) {
+        self.0.fetch_sub(1, Ordering::Relaxed);
+    }
+}
+
+/// RAII guard that calls [`WriteProgressTracker::finish`] on drop.
+///
+/// This ensures the final `done=true` callback fires even if the write
+/// errors or the future is cancelled.
+pub(crate) struct FinishOnDrop(pub Option<Arc<WriteProgressTracker>>);
+
+impl Drop for FinishOnDrop {
+    fn drop(&mut self) {
+        if let Some(t) = self.0.take() {
+            t.finish();
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+    use std::sync::atomic::{AtomicUsize, Ordering};
+
+    use arrow_array::record_batch;
+
+    use crate::connect;
+
+    #[tokio::test]
+    async fn test_progress_monitor_fires_callback() {
+        let db = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("id", Int32, [1, 2, 3])).unwrap();
+        let table = db
+            .create_table("progress_test", batch)
+            .execute()
+            .await
+            .unwrap();
+
+        let callback_count = Arc::new(AtomicUsize::new(0));
+        let last_rows = Arc::new(AtomicUsize::new(0));
+        let max_active = Arc::new(AtomicUsize::new(0));
+        let last_total_tasks = Arc::new(AtomicUsize::new(0));
+        let cb_count = callback_count.clone();
+        let cb_rows = last_rows.clone();
+        let cb_active = max_active.clone();
+        let cb_total_tasks = last_total_tasks.clone();
+
+        let new_data = record_batch!(("id", Int32, [4, 5, 6])).unwrap();
+        table
+            .add(new_data)
+            .progress(move |p| {
+                cb_count.fetch_add(1, Ordering::SeqCst);
+                cb_rows.store(p.output_rows(), Ordering::SeqCst);
+                cb_active.fetch_max(p.active_tasks(), Ordering::SeqCst);
+                cb_total_tasks.store(p.total_tasks(), Ordering::SeqCst);
+            })
+            .execute()
+            .await
+            .unwrap();
+
+        assert_eq!(table.count_rows(None).await.unwrap(), 6);
+        assert!(callback_count.load(Ordering::SeqCst) >= 1);
+        // Progress tracks the newly inserted rows, not the total table size.
+        assert_eq!(last_rows.load(Ordering::SeqCst), 3);
+        // At least one callback should have seen an active task.
+        assert!(max_active.load(Ordering::SeqCst) >= 1);
+        // total_tasks should reflect the write parallelism.
+        assert!(last_total_tasks.load(Ordering::SeqCst) >= 1);
+    }
+
+    #[tokio::test]
+    async fn test_progress_done_fires_at_end() {
+        let db = connect("memory://").execute().await.unwrap();
+        let batch = record_batch!(("id", Int32, [1, 2, 3])).unwrap();
+        let table = db
+            .create_table("progress_done", batch)
+            .execute()
+            .await
+            .unwrap();
+
+        let seen_done = Arc::new(std::sync::Mutex::new(Vec::<bool>::new()));
+        let seen = seen_done.clone();
+
+        let new_data = record_batch!(("id", Int32, [4, 5, 6])).unwrap();
+        table
+            .add(new_data)
+            .progress(move |p| {
+                seen.lock().unwrap().push(p.done());
+            })
+            .execute()
+            .await
+            .unwrap();
+
+        let done_flags = seen_done.lock().unwrap();
+        assert!(!done_flags.is_empty(), "at least one callback must fire");
+        // Only the last callback should have done=true.
+        let last = *done_flags.last().unwrap();
+        assert!(last, "last callback must have done=true");
+        // All earlier callbacks should have done=false.
+        for &d in done_flags.iter().rev().skip(1) {
+            assert!(!d, "non-final callbacks must have done=false");
+        }
+    }
+
+    #[tokio::test]
+    async fn test_progress_total_rows_known() {
+        let db = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("id", Int32, [1, 2, 3])).unwrap();
+        let table = db
+            .create_table("total_known", batch)
+            .execute()
+            .await
+            .unwrap();
+
+        let seen_total = Arc::new(std::sync::Mutex::new(Vec::new()));
+        let seen = seen_total.clone();
+
+        // RecordBatch implements Scannable with num_rows() -> Some(3)
+        let new_data = record_batch!(("id", Int32, [4, 5, 6])).unwrap();
+        table
+            .add(new_data)
+            .progress(move |p| {
+                seen.lock().unwrap().push(p.total_rows());
+            })
+            .execute()
+            .await
+            .unwrap();
+
+        let totals = seen_total.lock().unwrap();
+        // All callbacks (including done) should have total_rows = Some(3)
+        assert!(
+            totals.contains(&Some(3)),
+            "expected total_rows=Some(3) in at least one callback, got: {:?}",
+            *totals
+        );
+    }
+
+    #[tokio::test]
+    async fn test_progress_total_rows_unknown() {
+        use arrow_array::RecordBatchIterator;
+
+        let db = connect("memory://").execute().await.unwrap();
+
+        let batch = record_batch!(("id", Int32, [1, 2, 3])).unwrap();
+        let table = db
+            .create_table("total_unknown", batch)
+            .execute()
+            .await
+            .unwrap();
+
+        let seen_total = Arc::new(std::sync::Mutex::new(Vec::new()));
+        let seen = seen_total.clone();
+
+        // RecordBatchReader does not provide num_rows, so total_rows should be
+        // None in intermediate callbacks but always Some on the done callback.
+        let schema = arrow_schema::Schema::new(vec![arrow_schema::Field::new(
+            "id",
+            arrow_schema::DataType::Int32,
+            false,
+        )]);
+        let new_data: Box<dyn arrow_array::RecordBatchReader + Send> =
+            Box::new(RecordBatchIterator::new(
+                vec![Ok(record_batch!(("id", Int32, [4, 5, 6])).unwrap())],
+                Arc::new(schema),
+            ));
+        table
+            .add(new_data)
+            .progress(move |p| {
+                seen.lock().unwrap().push((p.total_rows(), p.done()));
+            })
+            .execute()
+            .await
+            .unwrap();
+
+        let entries = seen_total.lock().unwrap();
+        assert!(!entries.is_empty(), "at least one callback must fire");
+        for (total, done) in entries.iter() {
+            if *done {
+                assert!(
+                    total.is_some(),
+                    "done callback must have total_rows set, got: {:?}",
+                    total
+                );
+            } else {
+                assert_eq!(
+                    *total, None,
+                    "intermediate callback must have total_rows=None, got: {:?}",
+                    total
+                );
+            }
+        }
+    }
+}