Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21352#discussion_r188952711
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -1147,6 +1151,7 @@ case class Concat(children: Seq[Expression]) extends
Expression {
override def dataType: DataType =
children.map(_.dataType).headOption.getOrElse(StringType)
+ @transient
--- End diff --
ditto
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