maropu commented on pull request #30426:
URL: https://github.com/apache/spark/pull/30426#issuecomment-730346025


   I remember SPARK-12978 (#15945 and #10896) and is this related to it? cc: 
@cloud-fan Btw, have you checked if this optimization could make some queries 
(e.g., TPCDS) faster? (I just want to know actual performance numbers)


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