QuakeWang opened a new pull request, #449:
URL: https://github.com/apache/paimon-rust/pull/449
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### Purpose
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Global index coverage currently includes `extra_field_ids`, but Rust can
only read BTree entries by `index_field_id`. For predicates like `primary AND
extra`, the scanner may evaluate only the primary-field conjunct while fallback
coverage is computed from all predicate fields, including an extra field that
was not actually evaluated.
This PR tracks which fields were actually evaluated by the global index
scanner and uses only those fields when adding raw fallback ranges.
Extra-field-only predicates continue to fall back until composite-key BTree
reads are supported.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Return evaluated field ids together with global index row ranges.
- Compute raw fallback ranges from evaluated fields only.
- Add regression tests for extra-field-only fallback and mixed
primary/extra predicates.
### Tests
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- `cargo fmt --all -- --check`
- `cargo clippy --all-targets --workspace --features
fulltext,vortex,mosaic -- -D warnings`
- `cargo test -p paimon --all-targets --features fulltext,vortex,mosaic`
### API and Format
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### Documentation
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