Ngone51 commented on pull request #32027:
URL: https://github.com/apache/spark/pull/32027#issuecomment-811950605


   This commit 2541fd6 fixes the test failure. Previously, the test failed due 
to:
   
   `FlatMapCoGroupsInPandas` has a self flatMap. So, when 
`DeduplicateRelations` applies on `FlatMapCoGroupsInPandas`, both 
`leftAttributes` and `rightAttributes` would be rewrite after the right 
relation deduplicated. But that's not right for the  `leftAttributes` as it 
should reference the left relation.


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