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Bug #24778: Innodb: No result when using ORDER BY

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This bug was intruduced by the fix for bug#17212 (in 4.1). It is not 
ok to call test_if_skip_sort_order since this function will 
alter the execution plan. By contract it is not ok to call 
test_if_skip_sort_order in this context.

This bug appears only in the case when the optimizer has chosen 
an index for accessing a particular table but finds a covering 
index that enables it to skip ORDER BY. This happens in 
test_if_skip_sort_order.
This commit is contained in:
mhansson@dl145s.mysql.com
2007-04-20 11:01:53 +02:00
parent 83fff26261
commit f0fc4b88e0
3 changed files with 90 additions and 4 deletions
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41
mysql-test/r/key.result
View File

@ -414,3 +414,44 @@ a int(11) NO PRI
b varchar(20) NO MUL
c varchar(20) NO
drop table t1;
CREATE TABLE t1 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c INTEGER NOT NULL,
d CHAR(64)
);
CREATE TABLE t2 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c SMALLINT NOT NULL,
d DATETIME NOT NULL,
e SMALLINT NOT NULL,
f INTEGER NOT NULL,
g INTEGER NOT NULL,
h SMALLINT NOT NULL,
i INTEGER NOT NULL,
j INTEGER NOT NULL,
UNIQUE INDEX (b),
INDEX (b, d, e, f, g, h, i, j, c),
INDEX (c)
);
INSERT INTO t2 VALUES
(NULL, 1, 254, '1000-01-01 00:00:00', 257, 0, 0, 0, 0, 0),
(NULL, 2, 1, '2004-11-30 12:00:00', 1, 0, 0, 0, 0, 0),
(NULL, 3, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -21600, 0),
(NULL, 4, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -10800, 0),
(NULL, 5, 1, '2004-11-30 12:00:00', 1, 0, 0, 5, -10800, 0),
(NULL, 6, 1, '2004-11-30 12:00:00', 102, 0, 0, 0, 0, 0),
(NULL, 7, 1, '2004-11-30 12:00:00', 105, 2, 0, 0, 0, 0),
(NULL, 8, 1, '2004-11-30 12:00:00', 105, 10, 0, 0, 0, 0);
INSERT INTO t1 (b, c, d) VALUES
(3388000, -553000, NULL),
(3388000, -553000, NULL);
SELECT *
FROM t2 c JOIN t1 pa ON c.b = pa.a
WHERE c.c = 1
ORDER BY c.b, c.d
;
a b c d e f g h i j a b c d
2 2 1 2004-11-30 12:00:00 1 0 0 0 0 0 2 3388000 -553000 NULL
DROP TABLE t1, t2;

48
mysql-test/t/key.test
View File

@ -384,3 +384,51 @@ desc t1;
drop table t1;
# End of 4.1 tests
#
# Bug #24778: Innodb: No result when using ORDER BY
#
CREATE TABLE t1 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c INTEGER NOT NULL,
d CHAR(64)
);
CREATE TABLE t2 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c SMALLINT NOT NULL,
d DATETIME NOT NULL,
e SMALLINT NOT NULL,
f INTEGER NOT NULL,
g INTEGER NOT NULL,
h SMALLINT NOT NULL,
i INTEGER NOT NULL,
j INTEGER NOT NULL,
UNIQUE INDEX (b),
INDEX (b, d, e, f, g, h, i, j, c),
INDEX (c)
);
INSERT INTO t2 VALUES
(NULL, 1, 254, '1000-01-01 00:00:00', 257, 0, 0, 0, 0, 0),
(NULL, 2, 1, '2004-11-30 12:00:00', 1, 0, 0, 0, 0, 0),
(NULL, 3, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -21600, 0),
(NULL, 4, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -10800, 0),
(NULL, 5, 1, '2004-11-30 12:00:00', 1, 0, 0, 5, -10800, 0),
(NULL, 6, 1, '2004-11-30 12:00:00', 102, 0, 0, 0, 0, 0),
(NULL, 7, 1, '2004-11-30 12:00:00', 105, 2, 0, 0, 0, 0),
(NULL, 8, 1, '2004-11-30 12:00:00', 105, 10, 0, 0, 0, 0);
INSERT INTO t1 (b, c, d) VALUES
(3388000, -553000, NULL),
(3388000, -553000, NULL);
SELECT *
FROM t2 c JOIN t1 pa ON c.b = pa.a
WHERE c.c = 1
ORDER BY c.b, c.d
;
DROP TABLE t1, t2;

5
sql/sql_select.cc
View File

@ -5982,10 +5982,7 @@ make_join_readinfo(JOIN *join, ulonglong options)
*/
if (!ordered_set &&
(table == join->sort_by_table &&
(!join->order || join->skip_sort_order ||
test_if_skip_sort_order(tab, join->order, join->select_limit,
1))
) ||
(!join->order || join->skip_sort_order)) ||
(join->sort_by_table == (TABLE *) 1 && i != join->const_tables))
ordered_set= 1;