Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/21852#discussion_r206695251
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -416,6 +416,21 @@ 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 branches
+ .forall(_._2.semanticEquals(elseValue)) =>
+ // For non-deterministic conditions with side effect, we can not
remove it, or change
+ // the ordering. As a result, we try to remove the deterministic
conditions from the tail.
--- End diff --
Should be
```scala
hitNonDetermin = !branches(i - 1).deterministic
if (!hitNonDetermin) {
i -= 1
}
```
Personally, I like functional style more, but it's more efficient to use
Java style here. I updated as you suggested.
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