Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17770#discussion_r113624301
--- 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 --
My original thought is: If we use a barrier node, we need to modify many
places where we create a new logical plan and wrap it with the barrier node.
I will revamp it with a barrier node.
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