具有继承实体的命名查询忽略setFirstResult / setMaxResults

Question

我将继承用于JPA实体（RegisteredAction等）。

public class Feed {
    @ManyToOne
    @JoinColumn(name = "ACTION_ID", nullable = false)
    private Action action;

    @ManyToOne
    @JoinColumn(name = "USER_ID", nullable = false)
    private User user;  
    ...
}


public abstract class Action {
    @Id
    private Integer id;

    @Enumerated(EnumType.STRING)
    private FanoutType fanout;

    @Enumerated(EnumType.STRING)
    private ActionType type;
    ...
}


public class RegisteredAction extends Action {
    @ManyToOne
    @JoinColumn(name = "USER_ID", nullable = false)
    private User user;

    ...
}

对数据库执行命名查询：

select a from Feed as f join f.action as a where f.user.id = :userId order by f.creationDate desc

一切都很好，Hibernate加载有关实体的信息。但是如果我想添加setFirstResult / setMaxResults方法，则没有任何变化：

getEntityManager().createNamedQuery(Feed.FEED_BY_USER, Action.class)
            .setParameter(USER_ID, userId)
            .setHint(QueryHints.READ_ONLY, true)
            .setFirstResult(offset)
            .setMaxResults(count)
            .getResultList();

Hibernate会忽略这些设置并返回所有行。