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nexedi
MariaDB
Commits
85571ea7
Commit
85571ea7
authored
Jul 14, 2011
by
Sergey Petrunya
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Disable LooseScan and FirstMatch when outer joins are present.
parent
bf284498
Changes
5
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5 changed files
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12 additions
and
11 deletions
+12
-11
mysql-test/r/subselect4.result
mysql-test/r/subselect4.result
+2
-2
mysql-test/r/subselect_sj.result
mysql-test/r/subselect_sj.result
+2
-2
mysql-test/r/subselect_sj2.result
mysql-test/r/subselect_sj2.result
+3
-3
mysql-test/r/subselect_sj2_jcl6.result
mysql-test/r/subselect_sj2_jcl6.result
+2
-2
sql/opt_subselect.cc
sql/opt_subselect.cc
+3
-2
No files found.
mysql-test/r/subselect4.result
View file @
85571ea7
...
...
@@ -1219,7 +1219,7 @@ EXPLAIN
SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where;
FirstMatch(t1)
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where;
Start temporary; End temporary
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
...
...
@@ -1227,7 +1227,7 @@ c1 c1 c1
EXPLAIN
SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where;
FirstMatch
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where;
Start temporary; End temporary
1 PRIMARY t4 index NULL PRIMARY 3 NULL 2 Using index; Using join buffer (flat, BNL join)
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
...
...
mysql-test/r/subselect_sj.result
View file @
85571ea7
...
...
@@ -1457,8 +1457,8 @@ explain
select * from t0 where a in (select t1.a from t1 left join t2 on t1.a=t2.a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t0 ALL NULL NULL NULL NULL 2
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where
1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where;
FirstMatch(t0)
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where
; Start temporary
1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where;
End temporary
select * from t0 where a in (select t1.a from t1 left join t2 on t1.a=t2.a);
a
1
...
...
mysql-test/r/subselect_sj2.result
View file @
85571ea7
...
...
@@ -267,10 +267,10 @@ explain select *
from t0 where a in
(select t2.a+t3.a from t1 left join (t2 join t3) on t2.a=t1.a and t3.a=t1.a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t0 ALL NULL NULL NULL NULL 10
1 PRIMARY t1 index NULL a 5 NULL 10 Using index
1 PRIMARY t0 ALL NULL NULL NULL NULL 10
Start temporary
1 PRIMARY t1 index NULL a 5 NULL 10 Using index
; Using join buffer (flat, BNL join)
1 PRIMARY t2 ref a a 5 test.t1.a 1 Using where; Using index
1 PRIMARY t3 ref a a 5 test.t1.a 1 Using where; Using index;
FirstMatch(t0)
1 PRIMARY t3 ref a a 5 test.t1.a 1 Using where; Using index;
End temporary
drop table t0, t1,t2,t3;
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
...
...
mysql-test/r/subselect_sj2_jcl6.result
View file @
85571ea7
...
...
@@ -275,10 +275,10 @@ explain select *
from t0 where a in
(select t2.a+t3.a from t1 left join (t2 join t3) on t2.a=t1.a and t3.a=t1.a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t0 ALL NULL NULL NULL NULL 10
1 PRIMARY t0 ALL NULL NULL NULL NULL 10
Start temporary
1 PRIMARY t1 index NULL a 5 NULL 10 Using index; Using join buffer (flat, BNL join)
1 PRIMARY t2 ref a a 5 test.t1.a 1 Using where; Using index
1 PRIMARY t3 ref a a 5 test.t1.a 1 Using where; Using index;
FirstMatch(t0)
1 PRIMARY t3 ref a a 5 test.t1.a 1 Using where; Using index;
End temporary
drop table t0, t1,t2,t3;
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
...
...
sql/opt_subselect.cc
View file @
85571ea7
...
...
@@ -2160,7 +2160,8 @@ void advance_sj_state(JOIN *join, table_map remaining_tables,
table_map
handled_by_fm_or_ls
=
0
;
/* FirstMatch Strategy */
if
(
new_join_tab
->
emb_sj_nest
&&
optimizer_flag
(
join
->
thd
,
OPTIMIZER_SWITCH_FIRSTMATCH
))
optimizer_flag
(
join
->
thd
,
OPTIMIZER_SWITCH_FIRSTMATCH
)
&&
!
join
->
outer_join
)
{
const
table_map
outer_corr_tables
=
new_join_tab
->
emb_sj_nest
->
nested_join
->
sj_corr_tables
|
...
...
@@ -2255,7 +2256,7 @@ void advance_sj_state(JOIN *join, table_map remaining_tables,
If we got an option to use LooseScan for the current table, start
considering using LooseScan strategy
*/
if
(
loose_scan_pos
->
read_time
!=
DBL_MAX
)
if
(
loose_scan_pos
->
read_time
!=
DBL_MAX
&&
!
join
->
outer_join
)
{
pos
->
first_loosescan_table
=
idx
;
pos
->
loosescan_need_tables
=
...
...
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