Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21852#discussion_r205303174
--- 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 --
We may need test case including non deterministic cond.
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