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
        Function array (children 1)
         ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier array_union
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier arr