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## Summary Wire up `IVF_HNSW_FLAT` in the Rust core and Python SDK. The index was documented at https://docs.lancedb.com/indexing/vector-index but `lancedb.Table.create_index(index_type="IVF_HNSW_FLAT")` raised `ValueError: Unknown index type IVF_HNSW_FLAT` — the underlying `pylance` already accepted it, only the LanceDB wrapper was missing the wiring. **Rust core (`rust/lancedb`):** - Add `Index::IvfHnswFlat` / `IndexType::IvfHnswFlat` variants and the `IvfHnswFlatIndexBuilder` (modelled on `IvfHnswSqIndexBuilder`). - Build Lance params via the existing `VectorIndexParams::ivf_hnsw(...)` helper, keeping symmetry with the other `IVF_HNSW_*` variants. - Forward the variant in `RemoteTable::create_index` and add two parametrised tests (default + customised config) for the JSON serialisation. - New `NativeTable` integration test (`test_create_index_ivf_hnsw_flat`). **Python binding (`python/`):** - New `HnswFlat` dataclass + backwards-compat `IvfHnswFlat` alias. - PyO3 `extract_index_params` recognises the `HnswFlat` config. - `LanceTable.create_index(index_type="IVF_HNSW_FLAT", …)` and the sync `RemoteTable.create_index` both dispatch to the new config. - `IndexStatistics.index_type` `Literal` and `_lancedb.pyi` stubs cover the new type so `pyright`/`make check` stays clean. - Async integration tests (`HnswFlat` + `IvfHnswFlat` alias) and a sync dispatcher test, mirroring the existing `IVF_HNSW_SQ` coverage. - Existing `test_index_statistics_index_type_lists_all_supported_values` updated to include `IVF_HNSW_FLAT`. A matching Node.js / TypeScript binding is in a follow-up PR. Closes #3331 ## Test plan - [ ] \`cargo check --quiet --features remote --tests --examples\` - [ ] \`cargo test --quiet --features remote -p lancedb\` (covers the new \`test_create_index_ivf_hnsw_flat\` and the two new parametrised \`RemoteTable::create_index\` cases) - [ ] \`cargo fmt --all\` / \`cargo clippy --quiet --features remote --tests --examples\` - [ ] \`cd python && make develop && make check && make test\` (covers the two new async tests, the alias test, the dispatcher test, and the updated \`test_index_statistics_index_type_lists_all_supported_values\` assertion)
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
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.