create table global_priv_backup select * from mysql.global_priv;
update mysql.global_priv set priv=json_insert(priv, '$.plugin', 'unix_socket');
delete from mysql.global_priv 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'
replace mysql.global_priv select * from global_priv_backup;
flush privileges;
drop table global_priv_backup;