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

    https://github.com/apache/spark/pull/11599#discussion_r55481375
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
 ---
    @@ -380,6 +380,9 @@ object ColumnPruning extends Rule[LogicalPlan] {
             p
           }
     
    +    // Eliminate the Projects with empty projectList
    +    case p @ Project(projectList, child) if projectList.isEmpty => child
    --- End diff --
    
    Actually, I just try to run this tests without this patch. It passes. 
@gatorsmile Can you verify it?


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