use mysql;
create role test_role1@host1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@host1' at line 1
create role test_role2@host2, test_role1@host1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@host2, test_role1@host1' at line 1
create role test_role1;
create role test_role2, test_role3;
select user, host, is_role from user where user like 'test%';
user	host	is_role
test_role1		Y
test_role2		Y
test_role3		Y
drop role test_role1;
drop role test_role2, test_role3;
create role test_role1;
create role test_role1;
ERROR HY000: Operation CREATE ROLE failed for 'test_role1'
create role test_role1, test_role2;
ERROR HY000: Operation CREATE ROLE failed for 'test_role1'
select user, host, is_role from user where user like 'test%';
user	host	is_role
test_role1		Y
test_role2		Y
drop role test_role1;
drop role test_role1;
ERROR HY000: Operation DROP ROLE failed for 'test_role1'
drop role test_role1, test_role2;
ERROR HY000: Operation DROP ROLE failed for 'test_role1'
drop role root;
ERROR HY000: Operation DROP ROLE failed for 'root'
create user dummy@'';
drop role dummy;
ERROR HY000: Operation DROP ROLE failed for 'dummy'
drop user dummy@'';
select user, host, is_role from user where user like 'test%';
user	host	is_role
create role '';
ERROR OP000: Invalid role specification ``.
create role ' ';
ERROR OP000: Invalid role specification ``.
create role 'foo  ';
drop role foo;
create role r1;
drop user r1;
ERROR HY000: Operation DROP USER failed for 'r1'@'%'
drop role r1;
create role r1 with admin u1;
Warnings:
Note	1449	The user specified as a definer ('u1'@'%') does not exist
create user foo@bar;
drop user foo@bar;
drop role r1;
CREATE USER u1;
CREATE ROLE r1;
CREATE USER r1@localhost;
CREATE ROLE r2;
GRANT r2 to r1;
GRANT r2 to r1@localhost;
DROP ROLE r1;
SELECT * FROM mysql.roles_mapping;
Host	User	Role	Admin_option
localhost	r1	r2	N
localhost	root	r2	Y
SHOW GRANTS FOR r1@localhost;
Grants for r1@localhost
GRANT r2 TO 'r1'@'localhost'
GRANT USAGE ON *.* TO 'r1'@'localhost'
DROP USER u1;
DROP ROLE r2;
DROP USER r1@localhost;