Daniel RammerandClaude Opus 5
83cfcb84d2
Three defects from review, each reproduced before it was touched. A hybrid query matching nothing errored instead of returning nothing. When a leg comes back with no batches, `query_schemas` synthesizes a schema that already carries `_rowid`, and stamping then tried to append a second column of that name. The column is ours to define, so replace it rather than append. The unit test covering that case stripped `_rowid` by hand first, claiming to do "what the caller does" -- the caller does no such thing, so the test asserted a shape `run_hybrid` never produces. It now runs the synthesized schemas untouched, and a mock-server test covers a no-match query end to end. An explicit `with_row_id` combined with `return_score="all"` was accepted and then silently stripped, in either call order, because both set the same `_with_row_id` flag and the guard inferred caller intent from it. Record the caller's own request instead of inferring it: `with_row_id` on the hybrid builder sets `_caller_requested_row_id`, and `rerank` sets `_with_row_id` directly without going through it. A projected Blob v2 column slipped the same way. `blob_auto_row_id_for_scan` reports whether a row id would be added *automatically*, so it answers False once anything else has turned `_with_row_id` on -- including that reranker -- while the blob still needs a real row id to fetch through. Check the projected sources directly. Co-Authored-By: Claude Opus 5 <noreply@anthropic.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
Threading in CPU-limited containers
LanceDB uses separate pools for compute work and storage I/O. On a container with two visible CPUs, current releases intentionally use one compute worker by default; no manual configuration is needed. If every query logs an I/O core reservation warning on a two-CPU container, upgrade from LanceDB 0.21.1 or earlier.
The two commonly tuned environment variables control different resources:
LANCE_CPU_THREADSoverrides the number of compute workers. One worker is the appropriate setting for a two-CPU container when an explicit override is needed.LANCE_IO_THREADScontrols concurrent storage operations, not reserved CPU cores. Its default can be greater than the number of CPUs because I/O workers spend much of their time waiting for storage.
Keep the defaults unless measurements show that the workload benefits from an override. See the Lance threading model for the current defaults and tuning guidance.
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.