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BUG#6151 - myisam index corruption.

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Removed the assumption of a certain key order.
Since 4.1, keys are padded with blanks for comparison.
Hence, shorter keys sort behind longer keys, if the
data bytes have values below BLANK.
This commit is contained in:
ingo@mysql.com
2004-10-21 22:17:10 +02:00
parent 0130f4669a
commit 0d044c6869
3 changed files with 44 additions and 2 deletions
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4
myisam/mi_delete.c
View File

@@ -826,8 +826,8 @@ static uint remove_key(MI_KEYDEF *keyinfo, uint nod_flag,
else
get_key_length(rest_length,keypos);
if (next_length > prev_length)
{ /* Key after is based on deleted key */
/* Key after is based on deleted key */
{
uint pack_length,tmp;
bmove_upp((char*) keypos,(char*) (lastkey+next_length),
tmp=(next_length-prev_length));

23
mysql-test/r/key.result
View File

@@ -267,3 +267,26 @@ select t from t1 where t=0xD0B1D0B1212223D0B1D0B1D0B1D0B1;
t
??!"#????
drop table t1;
DROP TABLE IF EXISTS t1;
Warnings:
Note 1051 Unknown table 't1'
CREATE TABLE t1 (
c1 int,
c2 varbinary(240),
UNIQUE KEY (c1),
KEY (c2)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,'\Z\Z\Z\Z');
INSERT INTO t1 VALUES (2,'\Z\Z\Z\Z\Z\Z');
INSERT INTO t1 VALUES (3,'\Z\Z\Z\Z');
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
1
3
DELETE FROM t1 WHERE (c1 = 1);
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
3
DELETE FROM t1 WHERE (c1 = 3);
select c1 from t1 where c2='\Z\Z\Z\Z';
c1

19
mysql-test/t/key.test
View File

@@ -252,3 +252,22 @@ select c from t1 where c=0xD0B1212223D0B1D0B1D0B1D0B1D0B1;
select t from t1 where t=0xD0B1D0B1212223D0B1D0B1D0B1D0B1;
drop table t1;
#
# BUG#6151 - myisam index corruption
#
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (
c1 int,
c2 varbinary(240),
UNIQUE KEY (c1),
KEY (c2)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,'\Z\Z\Z\Z');
INSERT INTO t1 VALUES (2,'\Z\Z\Z\Z\Z\Z');
INSERT INTO t1 VALUES (3,'\Z\Z\Z\Z');
select c1 from t1 where c2='\Z\Z\Z\Z';
DELETE FROM t1 WHERE (c1 = 1);
select c1 from t1 where c2='\Z\Z\Z\Z';
DELETE FROM t1 WHERE (c1 = 3);
select c1 from t1 where c2='\Z\Z\Z\Z';