Github user dbtsai commented on a diff in the pull request: https://github.com/apache/spark/pull/21852#discussion_r205305691 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/SimplifyConditionalSuite.scala --- @@ -122,4 +126,25 @@ class SimplifyConditionalSuite extends PlanTest with PredicateHelper { None), CaseWhen(normalBranch :: trueBranch :: Nil, None)) } + + test("remove entire CaseWhen if all the outputs are semantic equivalence") { --- End diff -- Yes, I plan to add couple more tests tonight.
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