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MDEV-7474: Semi-Join's DuplicateWeedout strategy skipped ...

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JOIN::cur_dups_producing_tables was not maintained correctly in
the cases of greedy optimization (search_depth < n_tables).

Moved it to POSITION structure where it will be maintained automatically.

Removed POSITION::prefix_dups_producing_tables since its value can now
be calculated.
This commit is contained in:
Sergei Petrunia 2015-03-17 13:26:33 +03:00
commit c020d362b6
8 changed files with 341 additions and 16 deletions
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84
mysql-test/r/subselect_sj2.result
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@ -1178,5 +1178,89 @@ id nombre
2 row 2
3 row 3
DROP TABLE t1, t2;
#
# MDEV-7474: Semi-Join's DuplicateWeedout strategy skipped for some values of optimizer_search_depth
#
CREATE TABLE t1 (
t1id BIGINT(20) NOT NULL,
code VARCHAR(20),
PRIMARY KEY (t1id)
) COLLATE='utf8mb4_bin' ENGINE=InnoDB;
CREATE TABLE t2 (
t2id BIGINT(20) NOT NULL,
t1idref BIGINT(20) NOT NULL,
code VARCHAR(20),
PRIMARY KEY (t2id),
INDEX FK_T2_T1Id (t1idref),
CONSTRAINT FK_T2_T1Id FOREIGN KEY (t1idref) REFERENCES t1 (t1id)
) COLLATE='utf8mb4_bin' ENGINE=InnoDB;
CREATE TABLE t3 (
t3idref BIGINT(20) NOT NULL,
t2idref BIGINT(20) NOT NULL,
sequencenumber INT(10) NOT NULL,
PRIMARY KEY (t3idref, t2idref),
INDEX FK_T3_T2Id (t2idref),
CONSTRAINT FK_T3_T2Id FOREIGN KEY (t2idref) REFERENCES t2 (t2id)
) COLLATE='utf8mb4_bin' ENGINE=InnoDB;
INSERT INTO t1 (t1id) VALUES (100001),(100017),(100018),(100026),(100027),(100028),(100029),(100030),
(100031),(100032),(100033),(100034),(100035),(100036),(100037),(100038),(100040),(100041),(100042),
(100043),(100044),(100045),(100046),(100047);
INSERT IGNORE INTO t2 (t2id, t1idref) SELECT t1id, t1id FROM t1;
INSERT IGNORE INTO t1 VALUES (200001, 'a');
INSERT IGNORE INTO t2 (t2id, t1idref) VALUES (200011, 200001),(200012, 200001),(200013, 200001);
INSERT IGNORE INTO t3 VALUES (1, 200011, 1), (1, 200012, 2), (1, 200013, 3);
set @tmp7474= @@optimizer_search_depth;
SET SESSION optimizer_search_depth = 1;
SELECT SQL_NO_CACHE
T2_0_.t1idref,
T2_0_.t2id
FROM
t2 T2_0_
WHERE
T2_0_.t1idref IN (
SELECT
T1_1_.t1id
FROM
t3 T3_0_
INNER JOIN
t2 T2_1_
ON T3_0_.t2idref=T2_1_.t2id
INNER JOIN
t1 T1_1_
ON T2_1_.t1idref=T1_1_.t1id
WHERE
T3_0_.t3idref= 1
);
t1idref t2id
200001 200011
200001 200012
200001 200013
explain SELECT SQL_NO_CACHE
T2_0_.t1idref,
T2_0_.t2id
FROM
t2 T2_0_
WHERE
T2_0_.t1idref IN (
SELECT
T1_1_.t1id
FROM
t3 T3_0_
INNER JOIN
t2 T2_1_
ON T3_0_.t2idref=T2_1_.t2id
INNER JOIN
t1 T1_1_
ON T2_1_.t1idref=T1_1_.t1id
WHERE
T3_0_.t3idref= 1
);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY T3_0_ ref PRIMARY,FK_T3_T2Id PRIMARY 8 const 3 Using index; Start temporary
1 PRIMARY T2_1_ eq_ref PRIMARY,FK_T2_T1Id PRIMARY 8 test.T3_0_.t2idref 1
1 PRIMARY T1_1_ eq_ref PRIMARY PRIMARY 8 test.T2_1_.t1idref 1 Using index
1 PRIMARY T2_0_ ref FK_T2_T1Id FK_T2_T1Id 8 test.T2_1_.t1idref 1 Using index; End temporary
drop table t3,t2,t1;
set optimizer_search_depth=@tmp7474;
# This must be the last in the file:
set optimizer_switch=@subselect_sj2_tmp;