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Fixed LP bug #946055.

Browse source 
The function create_hj_key_for_table() that builds the descriptor of
the hash join key to access a table of a materialized subquery must
ignore any equi-join predicate depending on the tables not belonging
to the subquery.
This commit is contained in:
Igor Babaev 2012-03-05 20:32:28 -08:00
parent 8a5940c477
commit 04ee30e75a
4 changed files with 153 additions and 4 deletions
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51
mysql-test/r/subselect_mat.result
View file

@ -1913,6 +1913,57 @@ WHERE a IN (SELECT MAX(c) FROM t2 WHERE c < 4) AND b=7 AND (a IS NULL OR a=b);
a b
SET optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2;
#
# BUG#946055: Crash with semijoin IN subquery when hash join is used
#
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (7);
CREATE TABLE t2 (b int, c int, d varchar(1), e varchar(1), KEY (c), KEY (d, c));
INSERT INTO t2 VALUES
(4,2,'v','v'), (6,1,'v','v'), (0,5,'x','x'), (7,1,'x','x'),
(7,3,'i','i'), (7,1,'e','e'), (1,4,'p','p'), (1,2,'j','j');
SET @save_optimizer_switch=@@optimizer_switch;
SET @save_join_cache_level=@@join_cache_level;
SET join_cache_level=2;
EXPLAIN
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index NULL c 5 NULL 8 Using where; Using index
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
a c
7 1
7 1
7 1
SET optimizer_switch='join_cache_hashed=on';
SET join_cache_level=4;
EXPLAIN
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index NULL c 5 NULL 8 Using where; Using index
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s1 hash_ALL NULL #hash#$hj 5 test.s2.d 8 Using where; Using join buffer (flat, BNLH join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
a c
7 1
7 1
7 1
SET optimizer_switch=@save_optimizer_switch;
SET join_cache_level=@save_join_cache_level;
DROP TABLE t1,t2;
# This must be at the end:
set optimizer_switch=@subselect_sj_mat_tmp;
set join_cache_level=@save_join_cache_level;

53
mysql-test/r/subselect_sj_mat.result
View file

@ -1951,6 +1951,59 @@ WHERE a IN (SELECT MAX(c) FROM t2 WHERE c < 4) AND b=7 AND (a IS NULL OR a=b);
a b
SET optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2;
#
# BUG#946055: Crash with semijoin IN subquery when hash join is used
#
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (7);
CREATE TABLE t2 (b int, c int, d varchar(1), e varchar(1), KEY (c), KEY (d, c));
INSERT INTO t2 VALUES
(4,2,'v','v'), (6,1,'v','v'), (0,5,'x','x'), (7,1,'x','x'),
(7,3,'i','i'), (7,1,'e','e'), (1,4,'p','p'), (1,2,'j','j');
SET @save_optimizer_switch=@@optimizer_switch;
SET @save_join_cache_level=@@join_cache_level;
SET join_cache_level=2;
EXPLAIN
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index c c 5 NULL 8 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 8 func,func 1
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s1 ALL c NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
a c
7 1
7 1
7 1
SET optimizer_switch='join_cache_hashed=on';
SET join_cache_level=4;
EXPLAIN
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY t2 index c c 5 NULL 8 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 8 func,func 1
2 MATERIALIZED s2 ref d d 4 const 1 Using where; Using index
2 MATERIALIZED s1 hash_ALL c #hash#$hj 10 const,test.s2.d 8 Using where; Using join buffer (flat, BNLH join)
3 SUBQUERY t2 ALL NULL NULL NULL NULL 8
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
a c
7 1
7 1
7 1
SET optimizer_switch=@save_optimizer_switch;
SET join_cache_level=@save_join_cache_level;
DROP TABLE t1,t2;
# This must be at the end:
set optimizer_switch=@subselect_sj_mat_tmp;
set join_cache_level=@save_join_cache_level;

40
mysql-test/t/subselect_sj_mat.test
View file

@ -1602,6 +1602,46 @@ SET optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2;
--echo #
--echo # BUG#946055: Crash with semijoin IN subquery when hash join is used
--echo #
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (7);
CREATE TABLE t2 (b int, c int, d varchar(1), e varchar(1), KEY (c), KEY (d, c));
INSERT INTO t2 VALUES
(4,2,'v','v'), (6,1,'v','v'), (0,5,'x','x'), (7,1,'x','x'),
(7,3,'i','i'), (7,1,'e','e'), (1,4,'p','p'), (1,2,'j','j');
SET @save_optimizer_switch=@@optimizer_switch;
SET @save_join_cache_level=@@join_cache_level;
SET join_cache_level=2;
EXPLAIN
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
SET optimizer_switch='join_cache_hashed=on';
SET join_cache_level=4;
EXPLAIN
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
SELECT a, c FROM t1, t2
WHERE (a, c) IN (SELECT s1.b, s1.c FROM t2 AS s1, t2 AS s2
WHERE s2.d = s1.e AND s1.e = (SELECT MAX(e) FROM t2));
SET optimizer_switch=@save_optimizer_switch;
SET join_cache_level=@save_join_cache_level;
DROP TABLE t1,t2;
--echo # This must be at the end:
set optimizer_switch=@subselect_sj_mat_tmp;
set join_cache_level=@save_join_cache_level;

13
sql/sql_select.cc
View file

@ -60,6 +60,7 @@ static bool update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,
static bool sort_and_filter_keyuse(THD *thd, DYNAMIC_ARRAY *keyuse,
bool skip_unprefixed_keyparts);
static int sort_keyuse(KEYUSE *a,KEYUSE *b);
static bool are_tables_local(JOIN_TAB *jtab, table_map used_tables);
static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
bool allow_full_scan, table_map used_tables);
void best_access_path(JOIN *join, JOIN_TAB *s,
@ -7262,7 +7263,8 @@ static bool create_hj_key_for_table(JOIN *join, JOIN_TAB *join_tab,
do
{
if (!(~used_tables & keyuse->used_tables))
if (!(~used_tables & keyuse->used_tables) &&
are_tables_local(join_tab, keyuse->used_tables))
{
if (first_keyuse)
{
@ -7275,7 +7277,8 @@ static bool create_hj_key_for_table(JOIN *join, JOIN_TAB *join_tab,
for( ; curr < keyuse; curr++)
{
if (curr->keypart == keyuse->keypart &&
!(~used_tables & curr->used_tables))
!(~used_tables & curr->used_tables) &&
are_tables_local(join_tab, curr->used_tables))
break;
}
if (curr == keyuse)
@ -7306,7 +7309,8 @@ static bool create_hj_key_for_table(JOIN *join, JOIN_TAB *join_tab,
keyuse= org_keyuse;
do
{
if (!(~used_tables & keyuse->used_tables))
if (!(~used_tables & keyuse->used_tables) &&
are_tables_local(join_tab, keyuse->used_tables))
{
bool add_key_part= TRUE;
if (!first_keyuse)
@ -7314,7 +7318,8 @@ static bool create_hj_key_for_table(JOIN *join, JOIN_TAB *join_tab,
for(KEYUSE *curr= org_keyuse; curr < keyuse; curr++)
{
if (curr->keypart == keyuse->keypart &&
!(~used_tables & curr->used_tables))
!(~used_tables & curr->used_tables) &&
are_tables_local(join_tab, curr->used_tables))
{
keyuse->keypart= NO_KEYPART;
add_key_part= FALSE;