wangyum commented on a change in pull request #30852:
URL: https://github.com/apache/spark/pull/30852#discussion_r547069637
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/ReplaceNullWithFalseInPredicate.scala
##########
@@ -94,6 +94,7 @@ object ReplaceNullWithFalseInPredicate extends
Rule[LogicalPlan] {
replaceNullWithFalse(cond) -> replaceNullWithFalse(value)
}
val newElseValue = cw.elseValue.map(replaceNullWithFalse)
+ .orElse(if (newBranches.forall(_._2 == FalseLiteral))
Some(FalseLiteral) else None)
Review comment:
The result will not change. We will not push foldable into branches for
`EqualTo(CaseWhen(Seq((a, b)), None), Literal(1))` before this pr, but we will
push foldable into branches after this pr, because we will rewrite it to
`EqualTo(CaseWhen(Seq((a, b)), null), Literal(1))`.
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