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Annamalai Gurusami b8c9d93bf3 Bug #19306524 FAILING ASSERTION WITH TEMP TABLE FOR A PROCEDURE CALLED 
FROM A FUNCTION

Scenario:

In a stored procedure, CREATE TABLE statement is not allowed.  But an
exception is provided for CREATE TEMPORARY TABLE.  We can create a temporary
table in a stored procedure.

Let there be two stored functions f1 and f2 and two stored procedures p1 and
p2.  Their properties are as follows:

. stored function f1() calls stored procedure p1().
. stored function f2() calls stored procedure p2().
. stored procedure p1() creates temporary table t1.
. stored procedure p2() does DML on t1.

Consider the following situation:

1.  Autocommit mode is on. 
2.  select f1()
3.  select f2()

Step 2:  In this step, t1 would be created via p1().  A table level transaction
lock would have been taken.  The ::external_lock() would not have been called
on this table.  At the end of step 2, because of autocommit mode on, this table
level lock will be released.

Step 3:  When we execute DML on table t1 via p2() we have two problems:

Problem 1:

The function ha_innobase::external_lock() would have been called but since
it is a select query no table level locks would have been taken.  Hence the
following assert will fail:

ut_ad(lock_table_has(thr_get_trx(thr), index->table, LOCK_IX));

Solution:

The solution would be to identify this situation and take a table level lock
and use the proper lock type prebuilt->select_lock_type = LOCK_X for DML
operations.

Problem 2:

Another problem is that in step 3, ha_innobase::open() is never called on
the table t1.  

Solution:

The solution would be to identify this situation and call re-init the handler
of table t1.

rb#6429 approved by Krunal.
2014-09-18 15:17:39 +05:30

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#
# Bug #19306524 FAILING ASSERTION WITH TEMP TABLE FOR A PROCEDURE
# CALLED FROM A FUNCTION
#
call mtr.add_suppression("MySQL is trying to drop table");
CREATE PROCEDURE cachedata(
IN obj_id BIGINT UNSIGNED,
IN start DATETIME,
IN end DATETIME
)
cachedata:BEGIN
DECLARE cache_count BIGINT;
SET @timestamp := NOW();
CREATE TEMPORARY TABLE IF NOT EXISTS cachedata (
timestamp DATETIME,
object_id BIGINT UNSIGNED NOT NULL,
start DATETIME,
end DATETIME,
seqno BIGINT AUTO_INCREMENT,
value FLOAT,
PRIMARY KEY (seqno),
INDEX (timestamp),
INDEX (object_id, start, end)
) ENGINE=INNODB;
DELETE FROM cachedata WHERE
timestamp < DATE_SUB(@timestamp, INTERVAL 15 SECOND);
SELECT count(*) INTO cache_count FROM cachedata WHERE
object_id = obj_id
AND start = start
AND end = end;
IF cache_count > 0 THEN LEAVE cachedata;
END IF;
INSERT INTO cachedata (timestamp, object_id, start, end, value) VALUES
(@timestamp, obj_id, start, end, 1234),
(@timestamp, obj_id, start, end, 4567),
(@timestamp, obj_id, start, end, 8901),
(@timestamp, obj_id, start, end, 1234),
(@timestamp, obj_id, start, end, 4567),
(@timestamp, obj_id, start, end, 8901),
(@timestamp, obj_id, start, end, 1234),
(@timestamp, obj_id, start, end, 4567),
(@timestamp, obj_id, start, end, 8901),
(@timestamp, obj_id, start, end, 1234),
(@timestamp, obj_id, start, end, 4567),
(@timestamp, obj_id, start, end, 8901),
(@timestamp, obj_id, start, end, 2345),
(@timestamp, obj_id, start, end, 1234),
(@timestamp, obj_id, start, end, 4567),
(@timestamp, obj_id, start, end, 8901),
(@timestamp, obj_id, start, end, 2345),
(@timestamp, obj_id, start, end, 1234),
(@timestamp, obj_id, start, end, 4567),
(@timestamp, obj_id, start, end, 8901),
(@timestamp, obj_id, start, end, 2345);
END$$
CREATE FUNCTION get_cache(
obj_id BIGINT UNSIGNED,
start DATETIME,
end DATETIME
)
RETURNS FLOAT
READS SQL DATA
BEGIN
DECLARE result FLOAT;
CALL cachedata(obj_id, start, end);
SELECT SUM(value) INTO result FROM cachedata WHERE
object_id = obj_id
AND start = start
AND end = end;
RETURN result;
END$$
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
SELECT get_cache(1, '2014-01-01', '2014-02-01');
get_cache(1, '2014-01-01', '2014-02-01')
95247
select sleep(1);
sleep(1)
0
DROP FUNCTION get_cache;
DROP PROCEDURE cachedata;
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