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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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51
mysql-test/r/innodb_mysql.result
View File

@ -676,4 +676,55 @@ INSERT INTO t1 VALUES (1);
switch to connection default
SET AUTOCOMMIT=default;
DROP TABLE t1,t2;
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;
COUNT(*)
3072
EXPLAIN
SELECT COUNT(*) FROM t1
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL idx_b,idx_c NULL NULL NULL 3263 Using where
SELECT COUNT(*) FROM t1
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
COUNT(*)
3072
EXPLAIN
SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c)
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge idx_b,idx_c idx_c,idx_b 8,4 NULL 3262 Using sort_union(idx_c,idx_b); Using where
SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c)
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
COUNT(*)
3072
set @@sort_buffer_size=default;
DROP TABLE t1,t2;
End of 5.0 tests