gengliangwang commented on pull request #29101:
URL: https://github.com/apache/spark/pull/29101#issuecomment-660814078


   @maropu I checked the output of the optimized query plan of the 3 queries 
and they are equivalent.  I think the performance result should be consistent. 
   [after.txt](https://github.com/apache/spark/files/4945705/after.txt)
   [before.txt](https://github.com/apache/spark/files/4945706/before.txt)
   
   


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