HyukjinKwon commented on a change in pull request #34883:
URL: https://github.com/apache/spark/pull/34883#discussion_r768253475
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
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@@ -222,6 +222,20 @@ abstract class Expression extends TreeNode[Expression] {
*/
def childrenResolved: Boolean = children.forall(_.resolved)
+ // Return a roughly canonicalized expression, which recursively
canonicalizes each expression node
+ // without changing the structure of the expression tree.
Review comment:
Can we also describe when this can be used? If somebody mistakenly uses
`roughlyCanonicalized` instead of `canonicalized`, does it still work?
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