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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