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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. 


mysql-test/r/innodb_mysql.result:
  Added a test case for bug #26159.
mysql-test/t/innodb_mysql.test:
  Added a test case for bug #26159.
sql/opt_range.cc:
  Fixed bug #26159.
  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. 
  For an empty table quick_prefix_select->reset() was not called at all
  and thus some important initialization steps were missing.
This commit is contained in:
unknown
2007-02-10 23:55:56 -08:00
parent ce8c0ec29b
commit 3e4f834dfb
3 changed files with 57 additions and 5 deletions
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26
mysql-test/t/innodb_mysql.test
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@@ -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