aokolnychyi commented on PR #53360:
URL: https://github.com/apache/spark/pull/53360#issuecomment-3648411327

   This PR actually fixes an issue I discovered while testing MERGE with 4.1 RC 
in Iceberg. I believe the current logic in Spark 4.1 is a regression and leads 
to data loss (we replace existing nested fields with nulls, for instance). 
Spark 4.0 was a lot stricter than 4.1 and some of the 4.1 behavior is invalid.


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