--source include/have_xtradb.inc

SELECT COUNT(@@GLOBAL.innodb_use_stacktrace);
--echo 1 Expected

####################################################################
#   Check if Value can set                                         #
####################################################################

--error ER_INCORRECT_GLOBAL_LOCAL_VAR
SET @@GLOBAL.innodb_use_stacktrace=1;
--echo Expected error 'Read only variable'

SELECT COUNT(@@GLOBAL.innodb_use_stacktrace);
--echo 1 Expected

#################################################################
# Check if the value in GLOBAL Table matches value in variable  #
#################################################################

SELECT IF(@@GLOBAL.innodb_use_stacktrace, 'ON', 'OFF') = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='innodb_use_stacktrace';
--echo 1 Expected

SELECT COUNT(@@GLOBAL.innodb_use_stacktrace);
--echo 1 Expected

SELECT COUNT(VARIABLE_VALUE)
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
WHERE VARIABLE_NAME='innodb_use_stacktrace';
--echo 1 Expected

################################################################################
#  Check if accessing variable with and without GLOBAL point to same variable  #
################################################################################
SELECT @@innodb_use_stacktrace = @@GLOBAL.innodb_use_stacktrace;
--echo 1 Expected

SELECT COUNT(@@innodb_use_stacktrace);
--echo 1 Expected

--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@local.innodb_use_stacktrace);
--echo Expected error 'Variable is a GLOBAL variable'

--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@SESSION.innodb_use_stacktrace);
--echo Expected error 'Variable is a GLOBAL variable'

SELECT COUNT(@@GLOBAL.innodb_use_stacktrace);
--echo 1 Expected

--Error ER_BAD_FIELD_ERROR
SELECT innodb_use_stacktrace = @@SESSION.innodb_use_stacktrace;
--echo Expected error 'Readonly variable'
