Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10837#discussion_r50211956
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
---
@@ -269,6 +275,29 @@ abstract class TreeNode[BaseType <:
TreeNode[BaseType]] extends Product {
}
/**
+ * Returns a copy of this node where `rule` has been recursively applied
first to all of its
+ * children and then itself (post-order). When `rule` does not apply to
a given node, it is left
+ * unchanged.
+ *
+ * Unlike transfor and transformDown, this function does transform all
the matched nodes in one
--- End diff --
typo, `transfor` => `transform`
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