database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Bug#26996 - Update of a Field in a Memory Table ends with wrong result

Browse Source 
Using a MEMORY table BTREE index for scanning for updatable rows
could lead to an infinite loop.

Everytime a key was inserted into a btree index, the position
in the index scan was cleared. The search started from the
beginning and found the same key again.

Now we do not clear the position on key insert an more.
This commit is contained in:
istruewing@chilla.local
2007-03-19 15:56:53 +01:00
parent 629fed6c4d
commit 344f33bb89
3 changed files with 29 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
heap/hp_write.c
View File

@ -106,7 +106,6 @@ int hp_rb_write_key(HP_INFO *info, HP_KEYDEF *keyinfo, const byte *record,
heap_rb_param custom_arg; heap_rb_param custom_arg;
uint old_allocated; uint old_allocated;
info->last_pos= NULL; /* For heap_rnext/heap_rprev */
custom_arg.keyseg= keyinfo->seg; custom_arg.keyseg= keyinfo->seg;
custom_arg.key_length= hp_rb_make_key(keyinfo, info->recbuf, record, recpos); custom_arg.key_length= hp_rb_make_key(keyinfo, info->recbuf, record, recpos);
if (keyinfo->flag & HA_NOSAME) if (keyinfo->flag & HA_NOSAME)

15
mysql-test/r/heap_btree.result
View File

@ -280,4 +280,19 @@ a
1 1
1 1
drop table t1; drop table t1;
CREATE TABLE t1 (
c1 CHAR(3),
c2 INTEGER,
KEY USING BTREE(c1),
KEY USING BTREE(c2)
) ENGINE= MEMORY;
INSERT INTO t1 VALUES ('ABC',0), ('A',0), ('B',0), ('C',0);
UPDATE t1 SET c2= c2 + 1 WHERE c1 = 'A';
SELECT * FROM t1;
c1 c2
ABC 0
A 1
B 0
C 0
DROP TABLE t1;
End of 4.1 tests End of 4.1 tests

14
mysql-test/t/heap_btree.test
View File

@ -182,4 +182,18 @@ delete from t1 where a >= 2;
select a from t1 order by a; select a from t1 order by a;
drop table t1; drop table t1;
#
# Bug#26996 - Update of a Field in a Memory Table ends with wrong result
#
CREATE TABLE t1 (
c1 CHAR(3),
c2 INTEGER,
KEY USING BTREE(c1),
KEY USING BTREE(c2)
) ENGINE= MEMORY;
INSERT INTO t1 VALUES ('ABC',0), ('A',0), ('B',0), ('C',0);
UPDATE t1 SET c2= c2 + 1 WHERE c1 = 'A';
SELECT * FROM t1;
DROP TABLE t1;
--echo End of 4.1 tests --echo End of 4.1 tests