manuzhang commented on PR #37074:
URL: https://github.com/apache/spark/pull/37074#issuecomment-1181805060

   `DeduplicateRelations` doesn't exist in 3.1. 
   
   > Can you explain the rationale? 
   I'm not sure about it. BTW, could you give an example for why the check is 
needed in the first place? What if we removed it?


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