config root man

--source include/not_embedded.inc
--source include/not_gtid_enabled.inc

SET @start_global_value = @@session.gtid_next;
SELECT @start_global_value;

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

#
# show that it is writable
#
--error ER_LOCAL_VARIABLE
set global gtid_next = 1;
set session gtid_next = "ANONYMOUS";
select @@session.gtid_next;

#
# Show that one can set it to default
#
ROLLBACK;
set session gtid_next=default;
select @@session.gtid_next;

#
# Show that one cannot set it to NULL
#
ROLLBACK;
--error ER_WRONG_VALUE_FOR_VAR
set session gtid_next=NULL;
select @@session.gtid_next;

#
# Bug #20753378  ASSERTION `GTID_NEXT->TYPE != AUTOMATIC_GROUP || THD->OWNED_GTID.IS_EMPTY()'
#
# Setting SESSION.GTID_NEXT=default right after setting
# SESSION.GTID_NEXT='ANONYMOUS' causes an error
# 'ER_CANT_SET_GTID_NEXT_WHEN_OWNING_GTID', but this
# changed gtid_next type from 'ANONYMOUS' to 'AUTOMATIC'.
# So that the next transaction causes the above assertion error.
#
# Setting SESSION.GTID_NEXT=default should not change the
# gtid_next type if it causes an error.
#
# Steps to reproduce:
#  1) Set @@SESSION.GTID_NEXT to ANONYMOUS.
#  2) Set @@SESSION.GTID_NEXT to default to cause the
#     error ER_CANT_SET_GTID_NEXT_WHEN_OWNING_GTID.
#  3) Execute 'SELECT @@SESSION.GTID_NEXT' to verify there is no
#     assersion caused and gtid_next type is still ANONYMOUS.
#
SET @@SESSION.GTID_NEXT = 'ANONYMOUS';
--error ER_CANT_SET_GTID_NEXT_WHEN_OWNING_GTID
SET @@SESSION.GTID_NEXT = default;
# Verify that there is no assersion caused and
# gtid_next type is still ANONYMOUS.
SELECT @@SESSION.GTID_NEXT;

#
# restore original value
#
ROLLBACK;
set session gtid_next = @start_global_value;
select @@session.gtid_next;

#
# See rpl_gtid_execution.test for a comprehensive test case.
#