Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r159065306
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -653,7 +660,11 @@ object CombineConcats extends Rule[LogicalPlan] {
}
def apply(plan: LogicalPlan): LogicalPlan =
plan.transformExpressionsDown {
- case concat: Concat if concat.children.exists(_.isInstanceOf[Concat])
=>
+ case concat: Concat if concat.children.exists {
--- End diff --
ok
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