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Fixed LP bug #1058071 (mdev-564).

Browse Source 
In some rare cases when the value of the system variable join_buffer_size
was set to a number less than 256 the function JOIN_CACHE::set_constants 
determined the size of an offset in the join buffer equal to 1 though
the minimal join buffer required more than 256 bytes. This could cause
a crash of the server when records from the join buffer were read.
This commit is contained in:
Igor Babaev
2012-09-29 22:44:13 -07:00
parent e290d2bed5
commit 66bd2b56fc
7 changed files with 223 additions and 103 deletions
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70
mysql-test/r/select_pkeycache.result
View File

@ -4817,7 +4817,7 @@ CREATE TABLE t5 (f1 int) ;
INSERT INTO t5 VALUES (20),(5);
CREATE TABLE t6(f1 int);
INSERT INTO t6 VALUES (9),(7);
SET SESSION join_buffer_size = 2048;
SET SESSION join_buffer_size = 2176;
EXPLAIN
SELECT STRAIGHT_JOIN * FROM t2, (t1 LEFT JOIN (t3,t4) ON t1.f1 = t4.f1), t5, t6;
id select_type table type possible_keys key key_len ref rows Extra
@ -4831,50 +4831,50 @@ SELECT STRAIGHT_JOIN * FROM t2, (t1 LEFT JOIN (t3,t4) ON t1.f1 = t4.f1), t5, t6;
f1 f1 f1 f1 f2 f1 f1
3 9 NULL NULL NULL 20 9
7 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 20 7
7 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 5 9
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 20 9
18 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 5 9
3 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 7
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 20 9
18 9 NULL NULL NULL 20 9
7 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 20 7
7 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 5 7
3 9 NULL NULL NULL 20 9
7 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 20 7
7 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 5 9
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 20 9
18 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 5 9
3 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 7
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 20 9
18 9 NULL NULL NULL 20 9
7 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 5 7
3 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 9
3 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 5 7
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 20 9
3 9 NULL NULL NULL 20 9
7 9 NULL NULL NULL 20 9
18 9 NULL NULL NULL 20 9
7 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 20 7
3 9 NULL NULL NULL 20 7
7 9 NULL NULL NULL 20 7
18 9 NULL NULL NULL 20 7
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 5 9
3 9 NULL NULL NULL 5 9
7 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 9
18 9 NULL NULL NULL 5 7
3 9 NULL NULL NULL 5 7
7 9 NULL NULL NULL 5 7
18 9 NULL NULL NULL 5 7
SET SESSION join_buffer_size = DEFAULT;