Github user tedyu commented on a diff in the pull request:
https://github.com/apache/spark/pull/11647#discussion_r56065435
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -152,7 +152,10 @@ abstract class Expression extends TreeNode[Expression]
{
* `deterministic` expressions where `this.canonicalized ==
other.canonicalized` will always
* evaluate to the same result.
*/
- lazy val canonicalized: Expression = Canonicalize.execute(this)
+ lazy val canonicalized: Expression = {
+ val canonicalizedChildred = children.map(_.canonicalized)
--- End diff --
nit: canonicalizedChildred -> canonicalizedChildren
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