If there 3 above fe nodes,
the following opeartions will cause all FE nodes down.
DROP USER revoke_test_user
DROP ROLE revoke_test_role
DROP DATABASE IF EXISTS revoke_test_db
CREATE DATABASE revoke_test_db
CREATE ROLE revoke_test_role
CREATE USER revoke_test_user IDENTIFIED BY 'revoke_test_pwd'
GRANT SELECT_PRIV ON revoke_test_db.* TO ROLE 'revoke_test_role'
GRANT 'revoke_test_role' TO revoke_test_user
SHOW GRANTS FOR revoke_test_user
REVOKE 'revoke_test_role' from revoke_test_user
SHOW GRANTS FOR revoke_test_user
DROP USER revoke_test_user
DROP ROLE revoke_test_role
DROP DATABASE revoke_test_db