JkSelf edited a comment on pull request #30432:
URL: https://github.com/apache/spark/pull/30432#issuecomment-731989232


   > We already did. We don't coalesce shuffles if canChangeNumPartitions 
return false.
   
   The `canChangeNumPartitions ` return true when call the `repartition(col)`.  
So aqe will coalesce shuffles and change the user-specified partitioning to 
`UnknownPartitioning `.


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