浅谈laravel中的关联查询with的问题

Create Table

CREATE TABLE `user` (
 `uid` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
 `name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
 `email` varbinary(255) NOT NULL,
 PRIMARY KEY (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=114001 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

CREATE TABLE `user_options` (
 `id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
 `uid` mediumint(8) unsigned NOT NULL,
 `age` tinyint(3) NOT NULL,
 `sex` tinyint(1) NOT NULL,
 PRIMARY KEY (`id`),
 KEY `options_key` (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=114001 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

User::with(['options'=>function($query){
      $query->where('sex','=','1');
    }])->paginate(15);

laravel的debug监控到的SQL运行如下：

select count(*) as aggregate from `user`
select * from `user` limit 15 offset 0
select * from `user_options` where `user_options`.`uid` in ('1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15') and `sex` = '1'