Mysql8报错：ERROR 1227 (42000): Access denied; you need (at least one of) the SYSTEM_USER privilege(s) for this operation

Mysql8 提示：ERROR 1227 (42000): Access denied; you need (at least one of) the SYSTEM_USER privilege(s) for this operation

mysql>
原因：
MySQL8版本中新增了一个system_user帐户类型，由于root用户没有SYSTEM_USER权限，导致错误出现。
为root添加权限：
grant system_user on *.* to 'root';

flush privileges;