grant all privileges on *.* to root@"%" identified by ".";报错问题

MySQL 8.0已经不支持下面这种命令写法
grant all privileges on *.* to root@"%" identified by ".";

正确的写法是先创建用户

CREATE USER 'root'@'%' IDENTIFIED BY 'Hadoop3!';
再给用户授权

grant all privileges on *.* to 'root'@'%' ;