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Fixed bug #26159.

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A wrong order of statements in QUICK_GROUP_MIN_MAX_SELECT::reset
caused a crash when a query with DISTINCT was executed by a loose scan
for an InnoDB table that had been emptied.
This commit is contained in:
igor@olga.mysql.com
2007-02-10 23:55:56 -08:00
parent 3fe9de2879
commit 976e747aaf
3 changed files with 57 additions and 5 deletions
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27
mysql-test/r/innodb_mysql.result
View File

@ -383,6 +383,33 @@ EXPLAIN SELECT SQL_BIG_RESULT b, SUM(c) FROM t1 GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 128 Using filesort
DROP TABLE t1;
CREATE TABLE t1 (
id int NOT NULL,
name varchar(20) NOT NULL,
dept varchar(20) NOT NULL,
age tinyint(3) unsigned NOT NULL,
PRIMARY KEY (id),
INDEX (name,dept)
) ENGINE=InnoDB;
INSERT INTO t1(id, dept, age, name) VALUES
(3987, 'cs1', 10, 'rs1'), (3988, 'cs2', 20, 'rs1'), (3995, 'cs3', 10, 'rs2'),
(3996, 'cs4', 20, 'rs2'), (4003, 'cs5', 10, 'rs3'), (4004, 'cs6', 20, 'rs3'),
(4011, 'cs7', 10, 'rs4'), (4012, 'cs8', 20, 'rs4'), (4019, 'cs9', 10, 'rs5'),
(4020, 'cs10', 20, 'rs5'),(4027, 'cs11', 10, 'rs6'),(4028, 'cs12', 20, 'rs6');
EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range name name 44 NULL 2 Using where; Using index for group-by
SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
name dept
rs5 cs10
rs5 cs9
DELETE FROM t1;
EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range name name 44 NULL 2 Using where; Using index for group-by
SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
name dept
DROP TABLE t1;
show variables like 'innodb_rollback_on_timeout';
Variable_name Value
innodb_rollback_on_timeout OFF

26
mysql-test/t/innodb_mysql.test
View File

@ -384,6 +384,32 @@ EXPLAIN SELECT SQL_BIG_RESULT b, SUM(c) FROM t1 GROUP BY b;
DROP TABLE t1;
#
# Bug#26159: crash for a loose scan of a table that has been emptied
#
CREATE TABLE t1 (
id int NOT NULL,
name varchar(20) NOT NULL,
dept varchar(20) NOT NULL,
age tinyint(3) unsigned NOT NULL,
PRIMARY KEY (id),
INDEX (name,dept)
) ENGINE=InnoDB;
INSERT INTO t1(id, dept, age, name) VALUES
(3987, 'cs1', 10, 'rs1'), (3988, 'cs2', 20, 'rs1'), (3995, 'cs3', 10, 'rs2'),
(3996, 'cs4', 20, 'rs2'), (4003, 'cs5', 10, 'rs3'), (4004, 'cs6', 20, 'rs3'),
(4011, 'cs7', 10, 'rs4'), (4012, 'cs8', 20, 'rs4'), (4019, 'cs9', 10, 'rs5'),
(4020, 'cs10', 20, 'rs5'),(4027, 'cs11', 10, 'rs6'),(4028, 'cs12', 20, 'rs6');
EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
DELETE FROM t1;
EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';
DROP TABLE t1;
--source include/innodb_rollback_on_timeout.inc
--echo End of 5.0 tests

9
sql/opt_range.cc
View File

@ -8765,14 +8765,13 @@ int QUICK_GROUP_MIN_MAX_SELECT::reset(void)
DBUG_ENTER("QUICK_GROUP_MIN_MAX_SELECT::reset");
file->extra(HA_EXTRA_KEYREAD); /* We need only the key attributes */
result= file->ha_index_init(index);
result= file->index_last(record);
if (result == HA_ERR_END_OF_FILE)
DBUG_RETURN(0);
if (result)
if ((result= file->ha_index_init(index)))
DBUG_RETURN(result);
if (quick_prefix_select && quick_prefix_select->reset())
DBUG_RETURN(1);
result= file->index_last(record);
if (result == HA_ERR_END_OF_FILE)
DBUG_RETURN(0);
/* Save the prefix of the last group. */
key_copy(last_prefix, record, index_info, group_prefix_len);