create role role1;
create role none;
ERROR OP000: Invalid role specification `none`
create role public;
ERROR OP000: Invalid role specification `public`
drop role none;
ERROR HY000: Operation DROP ROLE failed for 'none'
grant none to role1;
ERROR OP000: Invalid role specification `none`
grant role1 to none;
ERROR OP000: Invalid role specification `none`
grant select on *.* to none;
ERROR OP000: Invalid role specification `none`
grant public to role1;
ERROR OP000: Invalid role specification `public`
grant role1 to public;
ERROR OP000: Invalid role specification `public`
grant select on *.* to public;
ERROR OP000: Invalid role specification `public`
grant role1 to current_role;
ERROR OP000: Invalid role specification `NONE`
revoke none from role1;
ERROR OP000: Invalid role specification `none`
revoke role1 from none;
ERROR OP000: Invalid role specification `none`
revoke select on *.* from none;
ERROR OP000: Invalid role specification `none`
revoke public from role1;
ERROR OP000: Invalid role specification `public`
revoke role1 from public;
ERROR OP000: Invalid role specification `public`
revoke select on *.* from public;
ERROR OP000: Invalid role specification `public`
show grants for none;
ERROR OP000: Invalid role specification `none`
show grants for public;
ERROR OP000: Invalid role specification `public`
create definer=none view test.v1 as select 1;
ERROR OP000: Invalid role specification `none`
create definer=public view test.v1 as select 1;
ERROR OP000: Invalid role specification `public`
drop role role1;
optimize table mysql.user;
Table	Op	Msg_type	Msg_text
mysql.user	optimize	status	OK
insert ignore mysql.user (user, is_role) values ('none', 'Y'), ('public', 'Y');
Warnings:
Warning	1364	Field 'ssl_cipher' doesn't have a default value
Warning	1364	Field 'x509_issuer' doesn't have a default value
Warning	1364	Field 'x509_subject' doesn't have a default value
Warning	1364	Field 'authentication_string' doesn't have a default value
flush privileges;
Warnings:
Error	1959	Invalid role specification `none`
Error	1959	Invalid role specification `public`
delete from mysql.user where is_role='Y';