Zouxxyy opened a new pull request, #7843:
URL: https://github.com/apache/paimon/pull/7843

   ### Purpose
   
   Follow-up of #7789. Extend `SchemaMergingUtils.diffSchemaChanges` to emit 
precise `AddColumn` for new struct fields nested inside `ARRAY` element / `MAP` 
value, instead of a coarse `UpdateColumnType` rewriting the whole nested type.
   
   Falls back to `UpdateColumnType` when a nested field is removed or a map key 
type changes.
   
   ### Tests
   
   - `SchemaMergingUtilsTest`
   - `MergeIntoTableTestBase`


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