public Parser sharingClause() {
        if (sharingClauseParser == null) {
           FutureParser future = scoped("sharingClause");
           sharingClauseParser = future;
           future.setParser(
               sequence(
                   token("SHARING"),
                   optional(
                       token("WITH")
                   ),
                   choice(
                       sequence(
                           token("READ"),
                           token("ONLY")
                       ),
                       sequence(
                           choice(
                               token("ALL"),
                               token("NO")
                           ),
                           optional(
                               token("OTHER")
                           )
                       )
                   )
               )
           );
        }

        return sharingClauseParser;
    }