Spring data JPA/hibernate对java.util.Map键的查询？

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    @Query("SELECT u FROM User u WHERE u.info['username'] = :username")
    User findByUsername(@Param("username") String username);
}

@Repository
public class UserRepository {
    @Autowired
    private SessionFactory sessionFactory;

    public User findByUsername(String username) {
        Session session = sessionFactory.getCurrentSession();
        Criteria criteria = session.createCriteria(User.class);
        criteria.add(Restrictions.eq("info['username']", username));
        return (User) criteria.uniqueResult();
    }
}

@Repository
public class UserRepository {
    @Autowired
    private SessionFactory sessionFactory;

    public User findByUsername(String username) {
        Session session = sessionFactory.getCurrentSession();
        Query query = session.createQuery("FROM User u WHERE key(u.info) = :username");
        query.setParameter("username", username);
        return (User) query.uniqueResult();
    }
}