Query query = createQueryOnCurrentSession("DELETE Email e " +
                "where " +
                "(status = :sent and creationTime <= :creation)" +
                "or " +
                "(status = :error and maxEttempts >= :maxEttempts)");

这是生成的sql：

delete from `email` where `status`=? and `creation_time`<=? or `status`=? and `attempts`>=?

问题：为什么括号不在sql中？
我希望它是：

delete from `email` where (`status`=? and `creation_time`<=?) or (`status`=? and `attempts`>=?)

也许我会在2个请求中删除？

delete from `email` where `status`=? and `creation_time`<=?
delete from `email` where `status`=? and `attempts`>=?