MyBatis-Plus 这个分页别名total和sql结果里的Total，名字一样，有点让人迷惑啊

https://github.com/baomidou/mybatis-plus/blob/07c31460cad055f7d633fe06cfb665f4af75230d/mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/plugins/inner/PaginationInnerInterceptor.java#L70

==>  Preparing: SELECT COUNT(*) AS total FROM   #这个total是别名，值是从表里可以查到的数据行数
==> Parameters: 
<==      Total: 1  #这个Total是指本次查询结果的行数