[GitHub] spark pull request #16255: [SPARK-18609][SQL]Fix when CTE with Join between ...

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

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

    https://github.com/apache/spark/pull/16255#discussion_r92186722
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala ---
    @@ -416,8 +418,8 @@ object ColumnPruning extends Rule[LogicalPlan] {
         case w: Window if w.windowExpressions.isEmpty => w.child
     
         // Eliminate no-op Projects
    -    case p @ Project(_, child) if sameOutput(child.output, p.output) => child
    -
    +    case p @ Project(_, child) if sameOutput(child.output, p.output) =>
    +      if (child.isInstanceOf[CatalogRelation]) p else child
    --- End diff --
    
    Why is a CatalogRelation different?


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