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Fixed Bug#1002564: Wrong result for a lookup query from a heap table

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mysql-test/suite/heap/heap_hash.result:
  Added test case
mysql-test/suite/heap/heap_hash.test:
  Added test case
storage/heap/hp_hash.c:
  Limit key data length to max key length
This commit is contained in:
Michael Widenius
2012-09-10 16:46:33 +03:00
parent 7fbd2de8b8
commit 1539f91267
3 changed files with 41 additions and 0 deletions
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19
mysql-test/suite/heap/heap_hash.result
View File

@ -427,4 +427,23 @@ INDEX(col_int_key) USING HASH) ENGINE = HEAP;
INSERT INTO t1 (col_int_nokey, col_int_key) VALUES (3, 0), (4, 0), (3, 1);
DELETE FROM t1 WHERE col_int_nokey = 5 ORDER BY col_int_key LIMIT 2;
DROP TABLE t1;
#
# Bug #1002564: Wrong result for a lookup query from a heap table
#
CREATE TABLE t1 (c1 VARCHAR(10) NOT NULL, KEY i1 (c1(3))) ENGINE=MEMORY DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES ('foo1'), ('bar2'), ('baz3');
explain SELECT * FROM t1 WHERE c1='bar2';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref i1 i1 5 const 2 Using where
SELECT * FROM t1 WHERE c1='bar2';
c1
bar2
ALTER TABLE t1 DROP KEY i1, ADD KEY il (c1(3)) using btree;
explain SELECT * FROM t1 WHERE c1='bar2';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref il il 5 const 1 Using where
SELECT * FROM t1 WHERE c1='bar2';
c1
bar2
DROP TABLE t1;
End of 5.5 tests

13
mysql-test/suite/heap/heap_hash.test
View File

@ -316,4 +316,17 @@ DELETE FROM t1 WHERE col_int_nokey = 5 ORDER BY col_int_key LIMIT 2;
DROP TABLE t1;
--echo #
--echo # Bug #1002564: Wrong result for a lookup query from a heap table
--echo #
CREATE TABLE t1 (c1 VARCHAR(10) NOT NULL, KEY i1 (c1(3))) ENGINE=MEMORY DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES ('foo1'), ('bar2'), ('baz3');
explain SELECT * FROM t1 WHERE c1='bar2';
SELECT * FROM t1 WHERE c1='bar2';
ALTER TABLE t1 DROP KEY i1, ADD KEY il (c1(3)) using btree;
explain SELECT * FROM t1 WHERE c1='bar2';
SELECT * FROM t1 WHERE c1='bar2';
DROP TABLE t1;
--echo End of 5.5 tests

9
storage/heap/hp_hash.c
View File

@ -348,6 +348,8 @@ ulong hp_rec_hashnr(register HP_KEYDEF *keydef, register const uchar *rec)
seg->length/cs->mbmaxlen);
set_if_smaller(length, char_length);
}
else
set_if_smaller(length, seg->length);
cs->coll->hash_sort(cs, pos+pack_length, length, &nr, &nr2);
}
else
@ -593,6 +595,11 @@ int hp_rec_key_cmp(HP_KEYDEF *keydef, const uchar *rec1, const uchar *rec2,
char_length2= my_charpos(cs, pos2, pos2 + char_length2, char_length);
set_if_smaller(char_length2, safe_length2);
}
else
{
set_if_smaller(char_length1, seg->length);
set_if_smaller(char_length2, seg->length);
}
if (cs->coll->strnncollsp(seg->charset,
pos1, char_length1,
@ -689,6 +696,8 @@ int hp_key_cmp(HP_KEYDEF *keydef, const uchar *rec, const uchar *key)
char_length2= my_charpos(cs, pos, pos + char_length_rec, char_length2);
set_if_smaller(char_length_rec, char_length2);
}
else
set_if_smaller(char_length_rec, seg->length);
if (cs->coll->strnncollsp(seg->charset,
(uchar*) pos, char_length_rec,