Yang Cen
f7feed48c3
## What Expose custom FTS stop-word lists in the Python and TypeScript public APIs, including their standalone tokenize helpers and remote index creation. This PR supports concrete string lists only. It does not add file or LanceDB-table stop-word sources. ## Why Rust already exposes Lance's custom stop-word list option. The Python and TypeScript APIs did not pass it through, and local index details did not retain the full tokenizer parameters needed by index-backed tokenization after reopening a table. ## How - Add `custom_stop_words` / `customStopWords` to the Python and TypeScript FTS and tokenize options. - Preserve `None` / `undefined`, empty lists, and list contents without normalization. - Load the persisted FTS segment parameters when returning local index details. - Serialize the concrete list in remote create-index requests. - Keep Python and TypeScript tests thin; behavior, persistence, query tokenization, and remote JSON coverage live primarily in Rust. ## Validation - `cargo check --quiet --features remote --tests --examples` - `cargo clippy --quiet --features remote --tests --examples` - `cargo test --quiet --features remote --tests` - Python extension rebuild with `uv` and `maturin` - Targeted Python tests: 4 passed - Python `ruff format --check` and `ruff check` - TypeScript build, typecheck, Biome lint, generated docs, and targeted tests --------- Co-authored-by: Yang Cen <yangcen@Yangs-Mac-mini.local>
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.