Github user mn-mikke commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21352#discussion_r188961645
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
 ---
    @@ -1324,15 +1329,17 @@ case class Concat(children: Seq[Expression]) 
extends Expression {
       since = "2.4.0")
     case class Flatten(child: Expression) extends UnaryExpression {
     
    -  private val MAX_ARRAY_LENGTH = ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH
    +  private def maxArrayLength: Int = 
ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH
     
    +  @transient
       private lazy val childDataType: ArrayType = 
child.dataType.asInstanceOf[ArrayType]
     
       override def nullable: Boolean = child.nullable || 
childDataType.containsNull
     
       override def dataType: DataType = childDataType.elementType
     
    -  lazy val elementType: DataType = 
dataType.asInstanceOf[ArrayType].elementType
    +  @transient
    --- End diff --
    
    doGenCode


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