[GitHub] spark pull request #17770: [SPARK-20392][SQL] Set barrier to prevent re-ente...

[cloud-fan <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/17770#discussion_r114330723
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala ---
    @@ -906,3 +907,36 @@ case class Deduplicate(
     
       override def output: Seq[Attribute] = child.output
     }
    +
    +/** A logical plan for setting a barrier of analysis */
    +case class AnalysisBarrier(child: LogicalPlan) extends UnaryNode {
    --- End diff --
    
    A simple way is to make `AnalysisBarrier` a leaf node, so that we won't transform through the wrapped plan.


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