xuyangzhong commented on PR #27838:
URL: https://github.com/apache/flink/pull/27838#issuecomment-4140615675

   > @xuyangzhong +1 for the optimization! I left some comments there.
   > 
   > For the tests, we should add at least one test case triggering the 
DELETE_BY_KEY path with immutable columns.
   
   Currently, immutable cols cannot be defined on sources that output rowkind 
`DELETE`, making it difficult to add tests. Therefore, I've decided to abandon 
this approach and revert the changes to SatisfyDeleteKindTraitVisitor, focusing 
only on modifications to SatisfyUpdateKindTraitVisitor. WDYT?


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