SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toDateOrNull (children 1)
     ExpressionList (children 1)
      Function arrayJoin (children 1)
       ExpressionList (children 1)
        Literal Array_[\'\', \'2018\', \'2018-01-02\', \'2018-1-2\', \'2018-01-2\', \'2018-1-02\', \'2018-ab-cd\', \'2018-01-02a\']
