lancedb-gatefixer[bot] 04e509278e fix(python): clarify schemas for batch UDF annotations (#4727)
`@udf` documented batch annotations without explaining that `pa.Array`
and `pa.RecordBatch` do not specify concrete Arrow element types or
field schemas. Document the requirement for both explicit schemas
(including class `__call__` methods), add an array example, and make
inference errors point callers to `input_schema` and `output_schema`.

Fixes #4721

Validation:
- Five new regression cases pass; all four diagnostic cases fail with
the original implementation.
- Function packaging, first-class Function slice 1/2 tests, and UDF
doctests: 168 passed, 3 failed. This includes the upstream BlobReader
annotation coverage. The three existing packaging tests fail while
importing temporary modules, before UDF registration; all three failures
also reproduce with the unchanged source and tests at `057a39a1`.
- Rebuilt the native extension in the uv-managed tests/dev environment.
- Python lint and formatting checks pass (`ruff check python`, `ruff
format --check python`); `cargo fmt --all` also passes without changes.
- Repository-wide `ruff check .` reports 48 existing errors under
`docs/web-tests`.

<!-- lance-gatekeeper-fix:v1 agent=2c6567ee3f128d3a0c3b9c68e36eca38
generation=1 -->

Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>
2026-10-28 16:37:57 -07:00
2023-03-17 18:15:19 -07:00
2025-03-10 09:01:23 -07:00

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LanceDB

The Multimodal Lakehouse for AI

How to Install ✦ Detailed Documentation ✦ Tutorials and Recipes ✦ Contributors

The ultimate multimodal data platform for AI/ML applications.

LanceDB is designed for fast, scalable, and production-ready vector search. It is built on top of the Lance columnar format. You can store, index, and search over petabytes of multimodal data and vectors with ease. LanceDB is a central location where developers can build, train and analyze their AI workloads.


Demo: Multimodal Search by Keyword, Vector or with SQL

LanceDB Multimodal Search

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⭐ Click here ⭐ to see how fast we're growing!

Key Features:

  • Fast Vector Search: Search billions of vectors in milliseconds with state-of-the-art indexing.
  • Comprehensive Search: Support for vector similarity search, full-text search and SQL.
  • Multimodal Support: Store, query and filter vectors, metadata and multimodal data (text, images, videos, point clouds, and more).
  • Advanced Features: Zero-copy, automatic versioning, manage versions of your data without needing extra infrastructure. GPU support in building vector index.

Products:

  • LanceDB Embedded (open source): 100% open source, runs in your application's process; your data can live on local disk or in object storage. No vendor lock-in.
  • LanceDB Enterprise: Production-scale distributed search, indexing, and maintenance. Plus, complete data sovereignty and security.

Ecosystem:

  • Columnar Storage: Built on the Lance columnar format for efficient storage and analytics.
  • Seamless Integration: Python, Node.js, Rust, and REST APIs for easy integration. Native Python and Javascript/Typescript support.
  • Rich Ecosystem: Integrations with LangChain 🦜️🔗, LlamaIndex 🦙, Apache-Arrow, Pandas, Polars, DuckDB and more on the way.

How to Install:

Follow the Quickstart doc to set up LanceDB locally.

API & SDK: We also support Python, Typescript and Rust SDKs

Interface Documentation
Python SDK https://lancedb.github.io/lancedb/python/python/
Typescript SDK https://lancedb.github.io/lancedb/js/globals/
Rust SDK https://docs.rs/lancedb/latest/lancedb/index.html
REST API https://docs.lancedb.com/api-reference/rest

Join Us and Contribute

We welcome contributions from everyone! Whether you're a developer, researcher, or just someone who wants to help out.

If you have any suggestions or feature requests, please feel free to open an issue on GitHub or discuss it on our Discord server.

Check out the GitHub Issues if you would like to work on the features that are planned for the future. If you have any suggestions or feature requests, please feel free to open an issue on GitHub.

Contributors

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Description
Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.
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