[GitHub] spark pull request: [SPARK-12385] [SQL] [WIP] Push Projection into...

[rxin <gi...@git.apache.org>]

Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10476#discussion_r49406403
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala ---
    @@ -287,6 +288,17 @@ object ColumnPruning extends Rule[LogicalPlan] {
     }
     
     /**
    + * Combines the adjacent [[Project]] and [[Join]] operators, iff their output sets are the same.
    + */
    +object CombineProjectJoin extends Rule[LogicalPlan] {
    +
    +  def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
    +    case p @ Project(_, j: Join)
    +      if j.outputSet == p.outputSet => j
    --- End diff --
    
    why is this specific to join?


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