Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r158936746
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -645,11 +646,16 @@ object CombineConcats extends Rule[LogicalPlan] {
stack.pop() match {
case Concat(children) =>
stack.pushAll(children.reverse)
+ case Cast(Concat(children), StringType, _) =>
--- End diff --
Is that possible that `Concat` has a child `Cast(Concat(children),
StringType, _)`
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