lilei1128 opened a new pull request, #10415:
URL: https://github.com/apache/paimon/pull/10415
### Purpose
Before this change, row-sidecar selection was estimated from row ranges
only and did not account for rows pruned by file indexes and deletion
vectors, so sparse reads could still fall back to the main data files.
This change reuses the existing DV-aware file-index result, intersects
its bitmap with the row-range selection, and uses the resulting row count
and ratio to choose row sidecars for both single-file and merged-group
reads without reevaluating the file index or performing an additional
deletion-vector read.
### Tests
- Add a unit test for row sidecar selection using the final bitmap.
- Add end-to-end tests for single-file and merged-group row sidecar reads
after applying file indexes and deletion vectors.
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