#
# Test temptable_use_mmap
#

# Restart the server to clean up any prior allocations
let $restart_parameters=;
--source include/restart_mysqld.inc

SELECT @@global.temptable_use_mmap;

--error ER_GLOBAL_VARIABLE
SET @@session.temptable_use_mmap=false;

--error ER_WRONG_VALUE_FOR_VAR
SET @@global.temptable_use_mmap=NULL;

--echo # Test with temptable_use_mmap set to false
--echo # to stop overflowing temptable to disk

SET @@global.temptable_use_mmap=false;

SELECT @@global.temptable_use_mmap;

# Ensure there are no existing allocations
SELECT count_alloc > 0
FROM performance_schema.memory_summary_global_by_event_name
WHERE event_name = 'memory/temptable/physical_disk';

CREATE TABLE t (c VARCHAR(128));

INSERT INTO t VALUES
(REPEAT('a', 128)),
(REPEAT('b', 128)),
(REPEAT('c', 128)),
(REPEAT('d', 128));

ANALYZE TABLE t;

SET GLOBAL temptable_max_ram = 2097152;

-- disable_result_log
SELECT * FROM
t AS t1,
t AS t2,
t AS t3,
t AS t4,
t AS t5,
t AS t6
ORDER BY 1
LIMIT 2;
-- enable_result_log

SET GLOBAL temptable_max_ram = default;

# There should be no allocations on the physical disk
SELECT count_alloc > 0
FROM performance_schema.memory_summary_global_by_event_name
WHERE event_name = 'memory/temptable/physical_disk';

DROP TABLE t;

--echo # Test with temptable_use_mmap set to true
--echo # to enable overflowing temptable to disk

SET @@global.temptable_use_mmap = true;
SELECT @@global.temptable_use_mmap;

#
# Test TempTable overflow to disk
#

CREATE TABLE t (c VARCHAR(128));

INSERT INTO t VALUES
(REPEAT('a', 128)),
(REPEAT('b', 128)),
(REPEAT('c', 128)),
(REPEAT('d', 128));

ANALYZE TABLE t;

SET GLOBAL temptable_max_ram = 2097152;

-- disable_result_log
SELECT * FROM
t AS t1,
t AS t2,
t AS t3,
t AS t4,
t AS t5,
t AS t6
ORDER BY 1
LIMIT 2;
-- enable_result_log

SET GLOBAL temptable_max_ram = default;
SET GLOBAL temptable_use_mmap = default;

SELECT @@global.temptable_use_mmap;

# Just make sure some disk pages were allocated, the exact number of bytes
# and pages is irrelevant for this test.
SELECT count_alloc > 0
FROM performance_schema.memory_summary_global_by_event_name
WHERE event_name = 'memory/temptable/physical_disk';

DROP TABLE t;

--source suite/xengine/include/check_xengine_log_error.inc