lance-format / lance-format/lance
Support update with blob encoding column
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A-encoding
enhancement
- Dominant language
- Rust
- Stars
- 7.1k
- Forks
- 852
- Avg merge
- 3d 18h
- Merged PRs (30d)
- 272
Description
from discord
in rust/lance/src/dataset/write/update.rs:269-291:
- The update operation creates a scanner with default blob handling (BlobsDescriptions)
- With this default, blob columns (marked with lance-encoding:blob) are read as descriptions (Struct with position, size)
- The schema validation at line 286 compares the stream schema (with Struct) against the dataset schema (with LargeBinary)
- This causes a schema mismatch error
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- 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.
Research direction
Start in rust/lance/src/dataset/write/update.rs:269-291 and trace how the update operation creates its scanner and validates the stream schema at line 286. Verify how blob columns marked with lance-encoding:blob are represented during the update, then confirm that an update no longer reports a mismatch between blob descriptions and LargeBinary dataset columns.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- data-engineering
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100