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Fixed bug #25798.

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This bug may manifest itself not only with the queries for which
the index-merge access method is chosen. It also may display
itself for queries with DISTINCT.

The bug was in how the Unique::get method used the merge_buffers
function. To compare elements in the the queue employed by
merge_buffers() it must use the buffpek_compare function rather
than the function for binary comparison.
This commit is contained in:
igor@olga.mysql.com
2007-07-01 15:33:28 -07:00
parent 38deea2496
commit f8683bfb44
5 changed files with 134 additions and 11 deletions
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54
mysql-test/t/innodb_mysql.test
View File

@@ -670,5 +670,59 @@ DISCONNECT c1;
DISCONNECT c2;
DROP TABLE t1,t2;
#
# Bug #25798: a query with forced index merge returns wrong result
#
CREATE TABLE t1 (
id int NOT NULL auto_increment PRIMARY KEY,
b int NOT NULL,
c datetime NOT NULL,
INDEX idx_b(b),
INDEX idx_c(c)
) ENGINE=InnoDB;
CREATE TABLE t2 (
b int NOT NULL auto_increment PRIMARY KEY,
c datetime NOT NULL
) ENGINE= MyISAM;
INSERT INTO t2(c) VALUES ('2007-01-01');
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t1(b,c) SELECT b,c FROM t2;
UPDATE t2 SET c='2007-01-02';
INSERT INTO t1(b,c) SELECT b,c FROM t2;
UPDATE t2 SET c='2007-01-03';
INSERT INTO t1(b,c) SELECT b,c FROM t2;
set @@sort_buffer_size=8192;
SELECT COUNT(*) FROM t1;
EXPLAIN
SELECT COUNT(*) FROM t1
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
SELECT COUNT(*) FROM t1
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
EXPLAIN
SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c)
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c)
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
set @@sort_buffer_size=default;
DROP TABLE t1,t2;
--echo End of 5.0 tests