sandeep-katta commented on a change in pull request #24837:
[SPARK-27917][SQL][BACKPORT-2.3] canonical form of CaseWhen object is incorrect
URL: https://github.com/apache/spark/pull/24837#discussion_r292299968
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
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@@ -199,6 +199,21 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
extends Product {
var changed = false
val remainingNewChildren = newChildren.toBuffer
val remainingOldChildren = children.toBuffer
+ def mapChild(child: Any): AnyRef = {
+ child match {
+ case arg: TreeNode[_] if containsChild(arg) =>
+ val newChild = remainingNewChildren.remove(0)
+ val oldChild = remainingOldChildren.remove(0)
+ if (newChild fastEquals oldChild) {
+ oldChild
+ } else {
+ changed = true
+ newChild
+ }
+ case nonChild: AnyRef => nonChild
+ case null => null
+ }
+ }
Review comment:
okay no problem
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