QuakeWang opened a new pull request, #421:
URL: https://github.com/apache/paimon-rust/pull/421
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### Purpose
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Mosaic row selection previously expanded each selected row range into a
`UInt64Array` of per-row indices before applying `take`. For large contiguous
ranges, this makes memory and CPU cost proportional to the selected row count
even though the input is already range-based.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Keep Mosaic row selections as row-group-local `(offset, len)` slices.
- Apply a single selected range with `RecordBatch::slice`.
- Apply multiple selected ranges with `concat_batches`.
- Preserve row counts for empty/all-missing projections.
- Add coverage to ensure large selections stay range-based.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo clippy --all-targets --workspace --features
fulltext,vortex,mosaic -- -D warnings`
- `cargo test -p paimon --all-targets --features fulltext,vortex,mosaic
test_mosaic`
- `cargo test -p paimon --all-targets --features fulltext,vortex,mosaic
arrow::format::mosaic::tests`
### API and Format
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### Documentation
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updates -->
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