Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18761#discussion_r130216604
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -241,6 +241,7 @@ trait RuntimeReplaceable extends UnaryExpression with
Unevaluable {
override def nullable: Boolean = child.nullable
override def foldable: Boolean = child.foldable
override def dataType: DataType = child.dataType
+ override lazy val canonicalized: Expression = child.canonicalized
--- End diff --
Updated PR description and comments accordingly.
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