ulysses-you commented on code in PR #36468:
URL: https://github.com/apache/spark/pull/36468#discussion_r867302077


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala:
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@@ -48,6 +48,8 @@ case class If(predicate: Expression, trueValue: Expression, 
falseValue: Expressi
   override def second: Expression = trueValue
   override def third: Expression = falseValue
   override def nullable: Boolean = trueValue.nullable || falseValue.nullable
+  override def foldable: Boolean = children.forall(_.foldable)

Review Comment:
   +1, pull out to `ConditionalExpressions`



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