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Fixed bug #14896.

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This bug in Field_string::cmp resulted in a wrong comparison 
with keys in partial indexes over multi-byte character fields.
Given field a is declared as 
  a varchar(16) collate utf8_unicode_ci
INDEX(a(4)) gives us an example of such an index.

Wrong key comparisons could lead to wrong result sets if 
the selected query execution plan used a range scan by 
a partial index over a utf8 character field.
This also caused wrong results in many other cases.


mysql-test/r/ctype_utf8.result:
  Added test cases for bug #14896.
mysql-test/t/ctype_utf8.test:
  Added test cases for bug #14896.
This commit is contained in:
unknown
2006-06-13 19:57:50 -07:00
parent e815f93bbf
commit 36b49259b1
3 changed files with 73 additions and 13 deletions
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40
mysql-test/r/ctype_utf8.result
View File

@ -1124,3 +1124,43 @@ check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
drop table t1;
SET NAMES utf8;
CREATE TABLE t1 (id int PRIMARY KEY,
a varchar(16) collate utf8_unicode_ci NOT NULL default '',
b int,
f varchar(128) default 'XXX',
INDEX (a(4))
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
INSERT INTO t1(id, a, b) VALUES
(1, 'cccc', 50), (2, 'cccc', 70), (3, 'cccc', 30),
(4, 'cccc', 30), (5, 'cccc', 20), (6, 'bbbbbb', 40),
(7, 'dddd', 30), (8, 'aaaa', 10), (9, 'aaaa', 50),
(10, 'eeeee', 40), (11, 'bbbbbb', 60);
SELECT id, a, b FROM t1;
id a b
1 cccc 50
2 cccc 70
3 cccc 30
4 cccc 30
5 cccc 20
6 bbbbbb 40
7 dddd 30
8 aaaa 10
9 aaaa 50
10 eeeee 40
11 bbbbbb 60
SELECT id, a, b FROM t1 WHERE a BETWEEN 'aaaa' AND 'bbbbbb';
id a b
8 aaaa 10
9 aaaa 50
6 bbbbbb 40
11 bbbbbb 60
SELECT id, a FROM t1 WHERE a='bbbbbb';
id a
6 bbbbbb
11 bbbbbb
SELECT id, a FROM t1 WHERE a='bbbbbb' ORDER BY b;
id a
6 bbbbbb
11 bbbbbb
DROP TABLE t1;

26
mysql-test/t/ctype_utf8.test
View File

@ -926,4 +926,30 @@ INSERT INTO t1 VALUES('uUABCDEFGHIGKLMNOPRSTUVWXYZ̈bbbbbbbbbbbbbbbbbbbbbbbbbbbb
check table t1;
drop table t1;
#
# Bug#14896: Comparison with a key in a partial index over mb chararacter field
#
SET NAMES utf8;
CREATE TABLE t1 (id int PRIMARY KEY,
a varchar(16) collate utf8_unicode_ci NOT NULL default '',
b int,
f varchar(128) default 'XXX',
INDEX (a(4))
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
INSERT INTO t1(id, a, b) VALUES
(1, 'cccc', 50), (2, 'cccc', 70), (3, 'cccc', 30),
(4, 'cccc', 30), (5, 'cccc', 20), (6, 'bbbbbb', 40),
(7, 'dddd', 30), (8, 'aaaa', 10), (9, 'aaaa', 50),
(10, 'eeeee', 40), (11, 'bbbbbb', 60);
SELECT id, a, b FROM t1;
SELECT id, a, b FROM t1 WHERE a BETWEEN 'aaaa' AND 'bbbbbb';
SELECT id, a FROM t1 WHERE a='bbbbbb';
SELECT id, a FROM t1 WHERE a='bbbbbb' ORDER BY b;
DROP TABLE t1;
# End of 4.1 tests