QuakeWang opened a new pull request, #401:
URL: https://github.com/apache/paimon-rust/pull/401
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### Purpose
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Linked issue: #378
The Mosaic reader already supports projection, missing physical columns, row
selection, deletion vectors, and row-group pruning, but the test coverage did
not exercise several important combinations across the format reader and
`DataFileReader` layers. This made regressions around schema alignment, null
preservation, stats conversion, and composed read filters easy to miss.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Add Mosaic format tests for supported scalar/temporal type round-trips
and nullable values.
- Cover Mosaic stats value conversion into Paimon `Datum`, including
fail-open cases.
- Cover batch splitting behavior used by Mosaic reads.
- Add `DataFileReader` tests for Mosaic with deletion vectors, mixed
Mosaic/Parquet splits, and predicate + deletion vector + projection composition.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `git diff --check`
- `cargo test -p paimon --features mosaic mosaic -- --nocapture`
- `cargo clippy -p paimon --features mosaic --tests -- -D warnings`
### API and Format
<!-- Does this change affect API or storage format -->
### Documentation
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updates -->
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