SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Identifier k (alias key)
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier t2
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier rdb
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier rdb.key
        Identifier t2.key
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier key