mcdull-zhang commented on pull request #31653:
URL: https://github.com/apache/spark/pull/31653#issuecomment-826466668


   > We found the same issue about failed to optimize skewed join due to the 
extra shuffle. Before submit a ticket, I just found this PR and 
[#30829](https://github.com/apache/spark/pull/30829).
   > 
   > Can we add the config to allow extra shuffle directly ? I think it's fine 
in first step although the new added shuffle can not be optimized by AQE 
framwork. And then we can make an another ticket to discuss how to make AQE 
optimize the shuffle which added during optimize query stages. What do you 
think about @ekoifman @cloud-fan
   
   +1


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