lancedb-gatefixer[bot]
9e73d440a3
## Summary - make the existing #1968 regression explicitly assert that schema-only table creation succeeds - verify the new table has zero rows and preserves the requested fixed-size vector schema before accepting subsequent data ## Root cause In v0.16.0, schema-only table creation sent an empty table through vector sanitization, which calculated a remainder using `len(data)` and raised `ZeroDivisionError`. Later refactors removed that runtime path, but the issue-specific regression only asserted the final row count after a subsequent add. This change makes the reported operation and its expected empty-table state explicit so the original defect remains directly covered. ## Validation - `uv run --extra tests pytest python/tests/test_table.py::test_create_table_without_data_with_vector_schema -q` - `uv --project python run --extra tests --extra dev ruff format --check python/python/tests/test_table.py` - `uv --project python run --extra tests --extra dev ruff check .` - `git diff --check` Fixes #1968 <!-- lance-gatekeeper-fix:v1 agent=b8ec6f40f4bba2f9beeaaae12233e5c4 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.