ArnavBalyan opened a new pull request, #8740:
URL: https://github.com/apache/paimon/pull/8740
### Purpose
- Queries using global index can silently return less data when index union
is required across multiple row ranges
- Make the union report an empty result as soon as any reader returns
empty, so callers are forced to fallback to scanning.
- Ensure empty result is returned if any range returns empty causing full
scan.
### Tests
- UT
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