Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10837#discussion_r50214246
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
---
@@ -253,6 +256,9 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
extends Product {
/**
* Returns a copy of this node where `rule` has been recursively applied
to it and all of its
* children (pre-order). When `rule` does not apply to a given node it
is left unchanged.
+ *
+ * Note that this function does not recurse into the children of a node
that is being replaced.
--- End diff --
I think so - actually both Michael and I were surprised today by this.
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