SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function arraySort (children 1)
     ExpressionList (children 1)
      Function arrayUnion (children 1)
       ExpressionList (children 2)
        Function array (children 1)
         ExpressionList
        Identifier arr
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier array_union
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier arr