n-young-db commented on code in PR #46285:
URL: https://github.com/apache/spark/pull/46285#discussion_r1583618515
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala:
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@@ -151,7 +159,7 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
// SPARK-32753: it only makes sense to copy tags to a new node
// but it's too expensive to detect other cases likes node removal
// so we make a compromise here to copy tags to node with no tags
- if (tags.isEmpty) {
+ if ((_tags eq null) || _tags.isEmpty) {
tags ++= other.tags
}
Review Comment:
Good call; i abstracted this emptiness check out.
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