roryqi opened a new pull request, #14384:
URL: https://github.com/apache/gravitino/pull/14384

   ### What changes were proposed in this pull request?
   
   Skip empty resolved column-mask restrictions before deduplication and 
conflict detection, matching the row-filter behavior. Add four regression tests 
covering identity masks, conditional branches, policy ordering, and type 
validation.
   
   ### Why are the changes needed?
   
   A policy returning the original value produces no projection, but its empty 
restriction currently conflicts with another policy's effective mask on the 
same field and rejects the table load.
   
   Follow-up to #14237.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes. Identity masks can coexist with an effective mask without rejecting the 
table load. Distinct effective masks still conflict, and invalid mask types 
still fail validation.
   
   ### How was this patch tested?
   
   The two new mixed-mask regression tests reproduced the conflict before the 
fix. All 58 experimental Iceberg REST module tests pass after the fix.
   
   ```bash
   ./gradlew :iceberg:iceberg-rest-server-experiment:spotlessApply 
:iceberg:iceberg-rest-server-experiment:test -PskipITs
   ```
   


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