lancedb-gatefixer[bot]
564e5d0d56
## Root cause `Table.to_polars()` disabled PyArrow predicate pushdown by selecting the non-PyArrow Polars scan callback. Polars 1.32.3 invokes that callback with `batch_size` both positionally and through its partial, so collecting the returned lazy frame raises `TypeError: _scan_pyarrow_dataset_impl() got multiple values for argument batch_size`. ## Fix - Keep the compatible PyArrow callback path. - Add an identity `map_batches` barrier so predicates stay in Polars instead of reaching the LanceDB adapter as unsupported PyArrow expressions. - Extend the tested Polars range through 1.32.3 and retain lazy-frame regression coverage. ## Validation - `python/tests/test_table.py::test_polars` with Polars 1.32.3 - `python/tests/test_table.py::test_polars` with the locked Polars 1.3.0 baseline - `ruff format --check` on the changed Python files - `ruff check .` - `uv lock --check` Fixes #2619 <!-- lance-gatekeeper-fix:v1 agent=0d42bcda944ac42765b25f2c19ff729f generation=1 --> --------- Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
Pre-Haswell x86_64 hosts: lancedb-compat
The default lancedb wheel targets x86-64-haswell (AVX2 + FMA + F16C) for full performance on modern hardware. Pre-Haswell hosts — Intel Sandy Bridge / Ivy Bridge / Westmere; AMD Bulldozer / Piledriver / Steamroller — don't have AVX2 and crash with Illegal instruction at import lancedb.
For those hosts, install the lancedb-compat package instead:
pip install lancedb-compat
Same Python API (import lancedb works as usual). The compat wheel is compiled at the x86-64-v2 baseline (Nehalem-class) and uses runtime SIMD dispatch in the embedded lance crate to pick the right kernel tier (scalar / AVX / AVX+FMA / AVX2+FMA / AVX-512) at load time, so it still goes fast on modern hardware while running cleanly on the pre-Haswell silicon. Use lance.simd_info() from Python to verify which tier was selected.
lancedb and lancedb-compat install to the same lancedb/ namespace and conflict at install time. Pick one. To switch, pip uninstall lancedb first, then pip install lancedb-compat (or vice-versa).
If you need a custom baseline (or lancedb-compat isn't yet published for your platform), build from source with the override:
RUSTFLAGS="-C target-cpu=x86-64-v2" maturin build --release
pip install ./target/wheels/lancedb-*.whl
Preview Releases
Stable releases are created about every 2 weeks. For the latest features and bug fixes, you can install the preview release. These releases receive the same level of testing as stable releases, but are not guaranteed to be available for more than 6 months after they are released. Once your application is stable, we recommend switching to stable releases.
pip install --pre --extra-index-url https://pypi.fury.io/lancedb/ lancedb
Usage
Basic Example
import lancedb
db = lancedb.connect('<PATH_TO_LANCEDB_DATASET>')
table = db.open_table('my_table')
results = table.search([0.1, 0.3]).limit(20).to_list()
print(results)
Development
See CONTRIBUTING.md for information on how to contribute to LanceDB.