aokolnychyi commented on PR #14155:
URL: https://github.com/apache/iceberg/pull/14155#issuecomment-3584374982

   I went through the changes and they look good to me.
   
   A few remaining points:
   - Remaining failing tests.
   - What shall we do with Comet?
   - I want to test more of the MERGE behavior changes in Spark to make sure 
they are correct.
   
   Like here, for instance, it seems suspicious that we now allow strings to be 
implicitly casted to int.
   
   ```
   assertThatThrownBy(
           () ->
               sql(
                   "MERGE INTO %s t USING source s "
                       + "ON t.id == s.c1 "
                       + "WHEN MATCHED THEN "
                       + "  UPDATE SET t.s.n1 = s.c3",
                   commitTarget()))
       .isInstanceOf(AnalysisException.class)
       .hasMessageContaining("Cannot safely cast `s`.`n1` \"STRING\" to 
\"INT\".");
   ```


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