database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

optimisation of independent ALL/ANY with aggregate function (WL#1115) (SCRUM)

Browse Source
This commit is contained in:
bell@sanja.is.com.ua
2003-08-12 12:38:03 +03:00
parent c06786fa00
commit 6ac8e9b93c
6 changed files with 184 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
mysql-test/r/subselect.result
View File

@ -1347,4 +1347,13 @@ explain select * from t3 where a >= all (select b from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
6
7
explain select * from t3 where a > all (select max(b) from t2 group by a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using temporary; Using filesort
drop table if exists t2, t3;

6
mysql-test/t/subselect.test
View File

@ -877,6 +877,7 @@ insert into t1 values (1);
insert into t2 values (1);
select * from t1 where exists (select s1 from t2 having max(t2.s1)=t1.s1);
drop table t1,t2;
#
# update subquery with wrong field (to force name resolving
# in UPDATE name space)
@ -897,4 +898,9 @@ create table t3 (a int);
insert into t3 values (6),(7),(3);
select * from t3 where a >= all (select b from t2);
explain select * from t3 where a >= all (select b from t2);
# optimized static ALL/ANY with grouping
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
explain select * from t3 where a > all (select max(b) from t2 group by a);
drop table if exists t2, t3;