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