QuakeWang opened a new pull request, #8157:
URL: https://github.com/apache/paimon/pull/8157
### Purpose
When all projected columns are missing from a Mosaic file due to schema
evolution, the reader currently does not push any native projection. It still
calls `readRowGroup`, which may read physical file columns even though the
final result only contains
NULL values.
This PR adds a Mosaic reader fast path for all-missing projections. The
reader still uses row group metadata for row counts and predicate pruning, but
returns an all-NULL batch directly when the row group matches, avoiding the
native row group read.
### Tests
- `mvn -pl paimon-mosaic test`
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