SET @start_global_value = @@global.aria_stats_method;
select @@global.aria_stats_method;
@@global.aria_stats_method
nulls_unequal
select @@session.aria_stats_method;
@@session.aria_stats_method
nulls_unequal
show global variables like 'aria_stats_method';
Variable_name	Value
aria_stats_method	nulls_unequal
show session variables like 'aria_stats_method';
Variable_name	Value
aria_stats_method	nulls_unequal
select * from information_schema.global_variables where variable_name='aria_stats_method';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_STATS_METHOD	nulls_unequal
select * from information_schema.session_variables where variable_name='aria_stats_method';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_STATS_METHOD	nulls_unequal
set global aria_stats_method=1;
select @@global.aria_stats_method;
@@global.aria_stats_method
nulls_equal
set session aria_stats_method=1;
select @@session.aria_stats_method;
@@session.aria_stats_method
nulls_equal
set session aria_stats_method=nulls_unequal;
select @@session.aria_stats_method;
@@session.aria_stats_method
nulls_unequal
set session aria_stats_method=nulls_equal;
select @@session.aria_stats_method;
@@session.aria_stats_method
nulls_equal
set session aria_stats_method=nulls_ignored;
select @@session.aria_stats_method;
@@session.aria_stats_method
nulls_ignored
set session aria_stats_method=1.1;
ERROR 42000: Incorrect argument type to variable 'aria_stats_method'
set session aria_stats_method=1e1;
ERROR 42000: Incorrect argument type to variable 'aria_stats_method'
set session aria_stats_method="foo";
ERROR 42000: Variable 'aria_stats_method' can't be set to the value of 'foo'
set session aria_stats_method=3;
ERROR 42000: Variable 'aria_stats_method' can't be set to the value of '3'
SET @@global.aria_stats_method = @start_global_value;