source include/not_embedded.inc;

#create a user with no privileges
create user test_user@localhost;
create role test_role1;
grant test_role1 to test_user@localhost;
--sorted_result
select user, host from mysql.user where user not like 'root';
--sorted_result
select * from mysql.roles_mapping;
grant select on *.* to test_role1;
--sorted_result
select * from mysql.user where user='test_role1';

change_user 'test_user';

--error ER_TABLEACCESS_DENIED_ERROR
select * from mysql.roles_mapping;

--sorted_result
show grants;
select current_user(), current_role();
set role test_role1;
select current_user(), current_role();
--sorted_result
show grants;
--sorted_result
select * from mysql.roles_mapping;

set role none;
select current_user(), current_role();
--error ER_TABLEACCESS_DENIED_ERROR
select * from mysql.roles_mapping;

change_user 'root';
delete from mysql.user where user='test_role1';
delete from mysql.roles_mapping where Role='test_role1';
flush privileges;
drop user 'test_user'@'localhost';

#
# MDEV-9898 SET ROLE NONE can crash mysqld.
#

create user user1;

--connect (con1,localhost,user1,,)
select current_user;
show grants;
set role none;

connection default;
drop user user1;