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

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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
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15
mysql-test/r/heap_btree.result
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@ -280,4 +280,19 @@ a
1
1
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