Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/6405#discussion_r31394820
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -395,10 +362,13 @@ case class CaseWhen(branches: Seq[Expression])
extends CaseWhenLike {
override def children: Seq[Expression] = branches
- override lazy val resolved: Boolean =
- childrenResolved &&
- whenList.forall(_.dataType == BooleanType) &&
- valueTypesEqual
+ override protected def checkTypesInternal(): TypeCheckResult = {
+ if (whenList.forall(_.dataType == BooleanType)) {
+ TypeCheckResult.success
+ } else {
+ TypeCheckResult.fail(s"WHEN expressions in CaseWhen should all be
boolean type")
--- End diff --
Perhaps include the first one that fails and its type in the error?
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