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

    https://github.com/apache/spark/pull/14327#discussion_r72008303
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
 ---
    @@ -150,11 +150,13 @@ class SimpleTestOptimizer extends Optimizer(
     
     /**
      * Pushes projects down beneath Sample to enable column pruning with 
sampling.
    + * This rule is only doable when the projects don't add new attributes.
      */
     object PushProjectThroughSample extends Rule[LogicalPlan] {
    --- End diff --
    
    ah, looks like `ColumnPruning` already handles it, can we just remove this 
rule?


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