Github user dbtsai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21852#discussion_r205946975
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
 ---
    @@ -416,6 +416,23 @@ 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 {
    --- End diff --
    
    We can not. When no `elseValue`, all the conditions are required to 
evaluated before hitting the default `elseValue` which is `null`.


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