morningman commented on PR #69536:
URL: https://github.com/apache/doris/pull/69536#issuecomment-6383396241

   Addressed the second review round in `cbf21fb0585`. Per finding:
   
   - 4363903193 (P1, v3 DATE→TIMESTAMP narrowed): fixed. The widening now 
starts from the selected definition and follows only recognized promotions, the 
SDK rules plus DATE→unzoned TIMESTAMP/TIMESTAMP_NS, so it can no longer narrow 
a key.
   - 4363903205 (P2, schema-only optionality lost): fixed. A dropped key is 
optional when any retained schema has it optional; a key required in every 
retained schema stays required.
   
   Four new tests in `IcebergScanPlanProviderTest`; all 1698 tests of 
fe-connector-iceberg pass. The PR description is updated.
   


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