peter-toth commented on a change in pull request #23531: [SPARK-24497][SQL]
Support recursive SQL query
URL: https://github.com/apache/spark/pull/23531#discussion_r247536393
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
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@@ -289,13 +294,13 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
extends Product {
/**
* Returns a copy of this node where `f` has been applied to all the nodes
children.
*/
- def mapChildren(f: BaseType => BaseType): BaseType = {
- if (children.nonEmpty) {
+ def mapChildren(f: BaseType => BaseType, forceCopy: Boolean = false):
BaseType = {
Review comment:
Well, I need this for `makeDeepCopy()` and didn't want to copy the logic.
Some of the plan nodes can't be reused in iterations so I think the most
straightforward way is to deep copy the tree. Any suggestion?
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