update mysql.global_priv set priv=json_insert(priv, '$.plugin', 'unix_socket')  where user='root';
flush privileges;
connect(localhost,USER,,test,MASTER_PORT,MASTER_SOCKET);
ERROR 28000: Access denied for user 'USER'@'localhost'
ERROR 28000: Access denied for user 'USER'@'localhost'
update mysql.global_priv set priv=json_compact(json_remove(priv, '$.plugin'))  where user='root';
flush privileges;