LantaoJin commented on pull request #28947:
URL: https://github.com/apache/spark/pull/28947#issuecomment-654661775


   > Can we make a general approach here? e.g. if we just optimize SMJ with 
both sides as shuffle stages, we can even optimize the first join of a 3-table 
join plan.
   
   #29021 is the PR to handle more general skew pattern includes n-tables join.


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