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 ########## @@ -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 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org