plusplusjiajia opened a new pull request, #7596:
URL: https://github.com/apache/paimon/pull/7596
### Purpose
Fix incorrect manifest entry merge logic in `read_entries_parallel()` that
has existed since #6451.
The old implementation collected all DELETE identifiers into a global set,
then filtered out all matching ADDs. This caused two bugs:
1. **Compaction file loss**: When a file goes through ADD → DELETE →
re-ADD (same identifier), the global DELETE set filters out *both* ADDs,
causing the re-added file to disappear from the result.
2. **Unmatched DELETE silently dropped**: DELETE entries without a
matching ADD were never included in the output, losing deletion information for
downstream consumers (e.g., manifest compaction rewrite,
changelog reads).
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