SELECT @@GLOBAL.gtid_slave_pos;
@@GLOBAL.gtid_slave_pos

SET gtid_binlog_state= '';
ERROR HY000: Variable 'gtid_binlog_state' is a GLOBAL variable and should be set with SET GLOBAL
SET SESSION gtid_binlog_state= '';
ERROR HY000: Variable 'gtid_binlog_state' is a GLOBAL variable and should be set with SET GLOBAL
SET GLOBAL gtid_binlog_state= DEFAULT;
ERROR 42000: Variable 'gtid_binlog_state' doesn't have a default value
SELECT @@session.gtid_binlog_state;
ERROR HY000: Variable 'gtid_binlog_state' is a GLOBAL variable