
SET @start_global_value = @@global.sync_master_info;
SELECT @start_global_value;

#
# exists as global only
#
select @@global.sync_master_info;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.sync_master_info;
show global variables like 'sync_master_info';
show session variables like 'sync_master_info';
select * from information_schema.global_variables where variable_name='sync_master_info';
select * from information_schema.session_variables where variable_name='sync_master_info';

#
# show that it's writable
#
set global sync_master_info=1;
select @@global.sync_master_info;
--error ER_GLOBAL_VARIABLE
set session sync_master_info=1;

#
# incorrect types
#
--error ER_WRONG_TYPE_FOR_VAR
set global sync_master_info=1.1;
--error ER_WRONG_TYPE_FOR_VAR
set global sync_master_info=1e1;
--error ER_WRONG_TYPE_FOR_VAR
set global sync_master_info="foo";

#
# min/max values
#
set global sync_master_info=0;
select @@global.sync_master_info;
set global sync_master_info=cast(-1 as unsigned int);
select @@global.sync_master_info;

SET @@global.sync_master_info = @start_global_value;
SELECT @@global.sync_master_info;
