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Posted to reviews@spark.apache.org by cloud-fan <gi...@git.apache.org> on 2018/12/05 07:06:49 UTC

[GitHub] spark pull request #17899: [SPARK-20636] Add new optimization rule to transp...

Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17899#discussion_r238950241
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala ---
    @@ -734,6 +734,28 @@ object CollapseWindow extends Rule[LogicalPlan] {
       }
     }
     
    +/**
    + * Transpose Adjacent Window Expressions.
    --- End diff --
    
    why is this rule useful?


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