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_r248199693
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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:
@mgaido I reverted the changes in `TreeNode` and introduced `reset()` on
`SparkPlan` as you suggested. Also fixed the case when we have an
`ExchangeCoordinator` and added test for it.
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