Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/16043#discussion_r98613413
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -293,6 +293,12 @@ object SimplifyConditionals extends Rule[LogicalPlan]
with PredicateHelper {
// from that. Note that CaseWhen.branches should never be empty,
and as a result the
// headOption (rather than head) added above is just an extra (and
unnecessary) safeguard.
branches.head._2
+
+ case e @ CaseWhen(branches, _) if branches.exists(_._1 ==
Literal(true)) =>
+ // a branc with a TRue condition eliminates all following branches,
+ // these branches can be pruned away
+ val (h, t) = branches.span(_._1 != Literal(true))
+ CaseWhen( h :+ t.head, None)
--- End diff --
Nit space
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