MySQL使用覆盖索引来优化limit语句

使用MySQL官方提供的测试数据库sakila来进行测试：

USE sakila;
explain select * from rental limit 10000,5;
explain select * from rental where rental_id >= (select rental_id from rental limit 10000,1) limit 5;
explain select * from rental a join (select rental_id from rental limit 10000,5) b USING(rental_id);