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create user test_user@localhost;
create role test_role1;
grant test_role1 to test_user@localhost;
create role test_role2;
grant test_role2 to test_role1;
use mysql;
select * from roles_mapping;
Host User Role Admin_option
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
localhost test_user test_role1 N
rename user 'test_user'@'localhost' to 'test_user_rm'@'newhost';
select user, host from user where user like 'test%';
user host
test_role1
test_role2
test_user_rm newhost
select * from roles_mapping;
Host User Role Admin_option
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
newhost test_user_rm test_role1 N
delete from mysql.roles_mapping;
delete from mysql.user where user like 'test%';
flush privileges;
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