Github user dbtsai commented on a diff in the pull request: https://github.com/apache/spark/pull/21852#discussion_r205306098 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala --- @@ -416,6 +416,22 @@ object SimplifyConditionals extends Rule[LogicalPlan] with PredicateHelper { // these branches can be pruned away val (h, t) = branches.span(_._1 != TrueLiteral) CaseWhen( h :+ t.head, None) + + case e @ CaseWhen(branches, Some(elseValue)) if { + // With previous rules, it's guaranteed that there must be one branch. --- End diff -- You're right. I removed the comment. Thanks.
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