cloud-fan commented on a change in pull request #30222:
URL: https://github.com/apache/spark/pull/30222#discussion_r517093766
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -510,6 +510,10 @@ object SimplifyConditionals extends Rule[LogicalPlan] with
PredicateHelper {
} else {
e.copy(branches = branches.take(i).map(branch => (branch._1,
elseValue)))
}
+
+ case EqualTo(CaseWhen(branches, _), right)
+ if branches.count(_._2.semanticEquals(right)) == 1 =>
Review comment:
if there are more than one matches, shall we combine the conditions with
`Or`?
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