lance-format / lance-format/lance

Broad Read-Write test

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@wjones127 is already working on this.

Since Sep 12, 2025.

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Description

Want a broad test that could catch issues like: https://github.com/lancedb/lance/pull/4396

Can do similar plan to https://github.com/lancedb/lance/issues/4416

  • Have one large master schema with all primitive types plus common nested ones
  • Have all index types on same dataset, including common variations
    • all distance types for IVF PQ
    • with_positions for FTS

Then vary the state of that dataset:

  • Fragmentation: one fragment, two rows per fragment
  • Deletions: No deletions, alternating deletions
  • Index coverage: full coverage, partial coverage

That gives 6 datasets to test.

Then run:

  • Full scan
  • Query that hits each index (with varying queries)
  • Append
  • Optimize each index

Contributor guide

Open the contributing guide

First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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