viirya commented on a change in pull request #21850:
URL: https://github.com/apache/spark/pull/21850#discussion_r480360191
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
##########
@@ -505,6 +505,9 @@ object SimplifyConditionals extends Rule[LogicalPlan] with
PredicateHelper {
} else {
e.copy(branches = branches.take(i).map(branch => (branch._1,
elseValue)))
}
+
+ case CaseWhen(Seq((cond, trueValue)), elseValue) =>
Review comment:
Is it better we limit to `BooleanType` case? I.e.,
```scala
case cw @ CaseWhen(Seq((cond, trueValue)), elseValue) if cw.dataType ==
BooleanType =>
```
The reason is because mostly the further optimization comes from #29567, and
it is for boolean type case only.
Or just rewrite it similarly like #29567?
```scala
case CaseWhen(Seq((cond, l @ Literal(null, _))), FalseLiteral) if
!cond.nullable => ...
case CaseWhen(Seq((cond, l @ Literal(null, _))), TrueLiteral) if
!cond.nullable => ...
```
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