StefanXiepj commented on pull request #32925:
URL: https://github.com/apache/spark/pull/32925#issuecomment-862097727


   > Is there a way we can benchmark the before and after to validate the 
avoided shuffle? Or if it was done already at least manually, somehow have the 
unit test expose the resulting difference?
   
   @dgd-contributor have benchmarked it. 
   
https://issues.apache.org/jira/browse/SPARK-35622?focusedCommentId=17363336&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17363336


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