cloud-fan commented on pull request #32192:
URL: https://github.com/apache/spark/pull/32192#issuecomment-836295271


   I've made it clear at the beginning of the PR description: INSERT/UPDATE * 
is an extension and I can't find it in other mainstream databases. If you open 
the docs you posted, none of them (except for Delta lake) supports 
INSERT/UPDATE *.
   
   Actually the original Spark PR to add MERGE SQL syntax was following 
https://docs.databricks.com/spark/latest/spark-sql/language-manual/delta-merge-into.html
 . It's a mistake that the INSERT/UPDATE * behavior is different and the 
current behavior is super confusing that we'd better fix it.


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