Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/17770#discussion_r113474943 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala --- @@ -72,6 +72,34 @@ object CurrentOrigin { } } +case class Barrier(node: Option[TreeNode[_]] = None) --- End diff -- Why not just create a logical plan node and override the `transformUp`/`transformDown` functions?
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