QuakeWang opened a new pull request, #530:
URL: https://github.com/apache/paimon-rust/pull/530
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### Purpose
<!-- Linking this pull request to the issue -->
Java Paimon encodes BLOB placeholders with length `-2`. Rust previously
rejected these entries and discarded overlapping older BLOB sequence groups, so
data-evolution reads could not fall back to previous values.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Preserve null, placeholder, and value states in the BLOB index.
- Resolve placeholders through older sequence groups while keeping
single-group reads lazy.
- Add Java-compatible fixtures and coverage for descriptors, row ranges,
deletion vectors, and schema evolution.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo clippy --all-targets --workspace --features fulltext,vortex -- -D
warnings`
- `cargo test -p paimon --all-targets --features fulltext,vortex`
### API and Format
<!-- Does this change affect API or storage format -->
No API or storage-format changes. This adds read compatibility for the
existing Java BLOB format.
### Documentation
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updates -->
No documentation changes.
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