cloud-fan commented on code in PR #38034:
URL: https://github.com/apache/spark/pull/38034#discussion_r1071340092
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala:
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@@ -618,6 +618,212 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
extends Product with Tre
}
}
+ /**
+ * Returns alternative copies of this node where `rule` has been recursively
applied to the tree.
+ *
+ * Users should not expect a specific directionality. If a specific
directionality is needed,
Review Comment:
the comment needs an update. We should also explain why only the down
direction is provided.
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