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)
      ExpressionList (children 1)
       Identifier key
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier key