lance-format / lance-format/lance
Read generic variable-width offsets
Open
@Xuanwo is already working on this.
Since Jul 28, 2026.
A-encoding
A-format
enhancement
- Dominant language
- Rust
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Description
Goal
Teach the Lance 2.3 variable-width reader to consume generic block-compressed offsets before any writer emits the new layout.
Scope
- Decode offsets using descriptor-derived payload arity.
- Validate cardinality, monotonicity, zero base, terminal offset, buffer counts, and arithmetic bounds.
- Cover scan, range, take, multi-chunk, and malformed inputs.
- Preserve legacy interleaved-flat reads.
Context
This is PR 4 of the Generic Block Compression stack extracted from https://github.com/lance-format/lance/pull/8002. It must land before the writer change.
Contributor guide
First steps
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- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
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