原因是由于root用户没有SYSTEM_USER权限，把权限加入后即可解决：
grant
system_user on *.* to 'root';
然后再修改test密码即可。不因为SYSTEM_USER权限涉及到所有帐户操作，所以不仅是修改密码，修改帐户信息，授权等都会报这个错，解决方法同样是上面的操作。
mysql you need (at least one of) the SYSTEM_USER privilege(s) for this operation
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