public Parser assignUsingClause() {
        if (assignUsingClauseParser == null) {
           FutureParser future = scoped("assignUsingClause");
           assignUsingClauseParser = future;
           future.setParser(
               sequence(
                   token("USING"),
                   dataName()
               )
           );
        }

        return assignUsingClauseParser;
    }