viirya commented on pull request #33281:
URL: https://github.com/apache/spark/pull/33281#issuecomment-877660696


   >  Fixes the performance issue mentioned in 
https://github.com/apache/spark/pull/32559/files#r633488455 and partially fixed 
in https://github.com/apache/spark/pull/33142/files#r660897248 using a new 
option to remove expressions from equivalence maps.
       Fixes an issue with identifying common expressions in conditional 
expressions (a side effect of the above).
       Fixes the issue of transparently canonicalized expressions (like 
PromotePrecision) are considered common subexpressions.
   
   Could you explain more about the three points listed in the description?


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