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Fixed bug #54539.

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Added a possibility not to factor out the condition pushed to
the access index out of the condition pushed to a joined table.
This is useful for the condition pushed to the index when a hashed
join buffer for BKA is employed. In this case the index condition
may be false for some, but for all records with the same key.
So the condition must be checked not only after index lookup,
but after fetching row data as well, and it makes sense not to 
factor out the condition from the condition checked after reading
row data,
The bug happened because the condition pushed to an index always
was factor out from the condition pushed to the accessed table.
This commit is contained in:
Igor Babaev
2010-10-01 10:08:10 -07:00
parent 21b1b5f040
commit 1320f6073c
5 changed files with 91 additions and 14 deletions
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31
mysql-test/r/join_cache.result
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@@ -4823,7 +4823,7 @@ explain select t2.f1, t2.f2, t2.f3 from t1,t2
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer
set join_cache_level=8;
select t2.f1, t2.f2, t2.f3 from t1,t2
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
@@ -4836,7 +4836,7 @@ explain select t2.f1, t2.f2, t2.f3 from t1,t2
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer
drop table t1,t2;
set join_cache_level=default;
#
@@ -5303,4 +5303,31 @@ NULL
NULL
set join_cache_level = default;
DROP TABLE t1,t2;
#
# BUG#54359 "Extra rows with join_cache_level=7,8 and two joins
# --and multi-column index"
#
CREATE TABLE t1 (
pk int NOT NULL,
a int DEFAULT NULL,
b varchar(16) DEFAULT NULL,
c varchar(16) DEFAULT NULL,
INDEX idx (b,a))
;
INSERT INTO t1 VALUES (4,9,'k','k');
INSERT INTO t1 VALUES (12,5,'k','k');
set join_cache_level = 8;
EXPLAIN
SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
WHERE s.pk AND s.a >= t.pk AND s.b = t.c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t ALL NULL NULL NULL NULL 2 Using where
1 SIMPLE s ref idx idx 19 test.t.c 1 Using index condition(BKA); Using where; Using join buffer
SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
WHERE s.pk AND s.a >= t.pk AND s.b = t.c;
a
9
9
set join_cache_level = default;
DROP TABLE t1;
set @@optimizer_switch=@save_optimizer_switch;