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ceb5468fd8bc9675d514949dd60c5bd7276bf3f4
mariadb/mysql-test/r/subquery_cache.result
unknown ceb5468fd8 Subquery cache (MWL#66) added. 
libmysqld/Makefile.am:
  The new file added.
mysql-test/r/index_merge_myisam.result:
  subquery_cache optimization option added.
mysql-test/r/myisam_mrr.result:
  subquery_cache optimization option added.
mysql-test/r/subquery_cache.result:
  The subquery cache tests added.
mysql-test/r/subselect3.result:
  Subquery cache switched off to avoid changing read statistics.
mysql-test/r/subselect3_jcl6.result:
  Subquery cache switched off to avoid changing read statistics.
mysql-test/r/subselect_no_mat.result:
  subquery_cache optimization option added.
mysql-test/r/subselect_no_opts.result:
  subquery_cache optimization option added.
mysql-test/r/subselect_no_semijoin.result:
  subquery_cache optimization option added.
mysql-test/r/subselect_sj.result:
  subquery_cache optimization option added.
mysql-test/r/subselect_sj_jcl6.result:
  subquery_cache optimization option added.
mysql-test/t/subquery_cache.test:
  The subquery cache tests added.
mysql-test/t/subselect3.test:
  Subquery cache switched off to avoid changing read statistics.
sql/CMakeLists.txt:
  The new file added.
sql/Makefile.am:
  The new files added.
sql/item.cc:
  Expression cache item (Item_cache_wrapper) added.
  Item_ref and Item_field fixed for correct usage of result field and fast resolwing in SP.
sql/item.h:
  Expression cache item (Item_cache_wrapper) added.
  Item_ref and Item_field fixed for correct usage of result field and fast resolwing in SP.
sql/item_cmpfunc.cc:
  Subquery cache added.
sql/item_cmpfunc.h:
  Subquery cache added.
sql/item_subselect.cc:
  Subquery cache added.
sql/item_subselect.h:
  Subquery cache added.
sql/item_sum.cc:
  Registration of subquery parameters added.
sql/mysql_priv.h:
  subquery_cache optimization option added.
sql/mysqld.cc:
  subquery_cache optimization option added.
sql/opt_range.cc:
  Fix due to subquery cache.
sql/opt_subselect.cc:
  Parameters of the function cahnged.
sql/procedure.h:
  .h file guard added.
sql/sql_base.cc:
  Registration of subquery parameters added.
sql/sql_class.cc:
  Option to allow add indeces to temporary table.
sql/sql_class.h:
  Item iterators added.
  Option to allow add indeces to temporary table.
sql/sql_expression_cache.cc:
  Expression cache for caching subqueries added.
sql/sql_expression_cache.h:
  Expression cache for caching subqueries added.
sql/sql_lex.cc:
  Registration of subquery parameters added.
sql/sql_lex.h:
  Registration of subqueries and subquery parameters added.
sql/sql_select.cc:
  Subquery cache added.
sql/sql_select.h:
  Subquery cache added.
sql/sql_union.cc:
  A new parameter to the function added.
sql/sql_update.cc:
  A new parameter to the function added.
sql/table.cc:
  Procedures to manage temporarty tables index added.
sql/table.h:
  Procedures to manage temporarty tables index added.
storage/maria/ha_maria.cc:
  Fix of handler to allow destoy a table in case of error during the table creation.
storage/maria/ha_maria.h:
  .h file guard added.
storage/myisam/ha_myisam.cc:
  Fix of handler to allow destoy a table in case of error during the table creation.
2010-07-10 13:37:30 +03:00

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set optimizer_switch='subquery_cache=on';
create table t1 (a int, b int);
insert into t1 values (1,2),(3,4),(1,2),(3,4),(3,4),(4,5),(4,5),(5,6),(5,6),(4,5);
create table t2 (c int, d int);
insert into t2 values (2,3),(3,4),(5,6),(4,1);
*
* Test subquery as top item in different clauses
*
#single value subquery test (SELECT list)
flush status;
select a, (select d from t2 where b=c) from t1;
a (select d from t2 where b=c)
1 3
3 1
1 3
3 1
3 1
4 6
4 6
5 NULL
5 NULL
4 6
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 7
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 31
set optimizer_switch='subquery_cache=off';
flush status;
select a, (select d from t2 where b=c) from t1;
a (select d from t2 where b=c)
1 3
3 1
1 3
3 1
3 1
4 6
4 6
5 NULL
5 NULL
4 6
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 61
set optimizer_switch='subquery_cache=on';
#single value subquery test (where)
flush status;
select a from t1 where (select d from t2 where b=c);
a
1
3
1
3
3
4
4
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 7
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 31
set optimizer_switch='subquery_cache=off';
flush status;
select a from t1 where (select d from t2 where b=c);
a
1
3
1
3
3
4
4
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 61
set optimizer_switch='subquery_cache=on';
#single value subquery test (having)
flush status;
select a from t1 where a > 0 having (select d from t2 where b=c);
a
1
3
1
3
3
4
4
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 7
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 31
set optimizer_switch='subquery_cache=off';
flush status;
select a from t1 where a > 0 having (select d from t2 where b=c);
a
1
3
1
3
3
4
4
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 61
set optimizer_switch='subquery_cache=on';
#single value subquery test (OUTER JOIN ON)
flush status;
select ta.a, tb.a from t1 ta join t1 tb on (select d from t2 where tb.b=c);
a a
1 1
3 1
1 1
3 1
3 1
4 1
4 1
5 1
5 1
4 1
1 3
3 3
1 3
3 3
3 3
4 3
4 3
5 3
5 3
4 3
1 1
3 1
1 1
3 1
3 1
4 1
4 1
5 1
5 1
4 1
1 3
3 3
1 3
3 3
3 3
4 3
4 3
5 3
5 3
4 3
1 3
3 3
1 3
3 3
3 3
4 3
4 3
5 3
5 3
4 3
1 4
3 4
1 4
3 4
3 4
4 4
4 4
5 4
5 4
4 4
1 4
3 4
1 4
3 4
3 4
4 4
4 4
5 4
5 4
4 4
1 4
3 4
1 4
3 4
3 4
4 4
4 4
5 4
5 4
4 4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 7
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 442
set optimizer_switch='subquery_cache=off';
flush status;
select ta.a, tb.a from t1 ta join t1 tb on (select d from t2 where tb.b=c);
a a
1 1
3 1
1 1
3 1
3 1
4 1
4 1
5 1
5 1
4 1
1 3
3 3
1 3
3 3
3 3
4 3
4 3
5 3
5 3
4 3
1 1
3 1
1 1
3 1
3 1
4 1
4 1
5 1
5 1
4 1
1 3
3 3
1 3
3 3
3 3
4 3
4 3
5 3
5 3
4 3
1 3
3 3
1 3
3 3
3 3
4 3
4 3
5 3
5 3
4 3
1 4
3 4
1 4
3 4
3 4
4 4
4 4
5 4
5 4
4 4
1 4
3 4
1 4
3 4
3 4
4 4
4 4
5 4
5 4
4 4
1 4
3 4
1 4
3 4
3 4
4 4
4 4
5 4
5 4
4 4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 472
set optimizer_switch='subquery_cache=on';
#single value subquery test (GROUP BY)
flush status;
select max(a) from t1 GROUP BY (select d from t2 where b=c);
max(a)
5
3
1
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 10
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 17
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 4
Handler_read_rnd_next 36
set optimizer_switch='subquery_cache=off';
flush status;
select max(a) from t1 GROUP BY (select d from t2 where b=c);
max(a)
5
3
1
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 10
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 4
Handler_read_rnd_next 86
set optimizer_switch='subquery_cache=on';
#single value subquery test (distinct GROUP BY)
flush status;
select distinct max(a) from t1 GROUP BY (select d from t2 where b=c);
max(a)
5
3
1
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 10
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 17
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 4
Handler_read_rnd_next 41
set optimizer_switch='subquery_cache=off';
flush status;
select distinct max(a) from t1 GROUP BY (select d from t2 where b=c);
max(a)
5
3
1
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 10
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 4
Handler_read_rnd_next 91
set optimizer_switch='subquery_cache=on';
#single value subquery test (ORDER BY)
flush status;
select a from t1 ORDER BY (select d from t2 where b=c);
a
5
5
3
3
3
1
1
4
4
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 7
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 31
set optimizer_switch='subquery_cache=off';
flush status;
select a from t1 ORDER BY (select d from t2 where b=c);
a
5
5
3
3
3
1
1
4
4
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 61
set optimizer_switch='subquery_cache=on';
#single value subquery test (distinct ORDER BY)
flush status;
select distinct a from t1 ORDER BY (select d from t2 where b=c);
a
5
3
1
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 7
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 4
Handler_read_rnd_next 37
set optimizer_switch='subquery_cache=off';
flush status;
select distinct a from t1 ORDER BY (select d from t2 where b=c);
a
5
3
1
4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 4
Handler_read_rnd_next 67
set optimizer_switch='subquery_cache=on';
#single value subquery test (LEFT JOIN ON)
flush status;
select ta.a, tb.a from t1 ta left join t1 tb on (select d from t2 where tb.b=c);
a a
1 1
1 3
1 1
1 3
1 3
1 4
1 4
1 4
3 1
3 3
3 1
3 3
3 3
3 4
3 4
3 4
1 1
1 3
1 1
1 3
1 3
1 4
1 4
1 4
3 1
3 3
3 1
3 3
3 3
3 4
3 4
3 4
3 1
3 3
3 1
3 3
3 3
3 4
3 4
3 4
4 1
4 3
4 1
4 3
4 3
4 4
4 4
4 4
4 1
4 3
4 1
4 3
4 3
4 4
4 4
4 4
5 1
5 3
5 1
5 3
5 3
5 4
5 4
5 4
5 1
5 3
5 1
5 3
5 3
5 4
5 4
5 4
4 1
4 3
4 1
4 3
4 3
4 4
4 4
4 4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 106
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 70
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 141
set optimizer_switch='subquery_cache=off';
flush status;
select ta.a, tb.a from t1 ta left join t1 tb on (select d from t2 where tb.b=c);
a a
1 1
1 3
1 1
1 3
1 3
1 4
1 4
1 4
3 1
3 3
3 1
3 3
3 3
3 4
3 4
3 4
1 1
1 3
1 1
1 3
1 3
1 4
1 4
1 4
3 1
3 3
3 1
3 3
3 3
3 4
3 4
3 4
3 1
3 3
3 1
3 3
3 3
3 4
3 4
3 4
4 1
4 3
4 1
4 3
4 3
4 4
4 4
4 4
4 1
4 3
4 1
4 3
4 3
4 4
4 4
4 4
5 1
5 3
5 1
5 3
5 3
5 4
5 4
5 4
5 1
5 3
5 1
5 3
5 3
5 4
5 4
5 4
4 1
4 3
4 1
4 3
4 3
4 4
4 4
4 4
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 671
set optimizer_switch='subquery_cache=on';
#single value subquery test (PS)
prepare stmt1 from 'select a, (select d from t2 where b=c) + 1 from t1';
execute stmt1;
a (select d from t2 where b=c) + 1
1 4
3 2
1 4
3 2
3 2
4 7
4 7
5 NULL
5 NULL
4 7
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
execute stmt1;
a (select d from t2 where b=c) + 1
1 4
3 2
1 4
3 2
3 2
4 7
4 7
5 NULL
5 NULL
4 7
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 12
Subquery_cache_miss 8
deallocate prepare stmt1;
#single value subquery test (SP)
CREATE PROCEDURE p1() select a, (select d from t2 where b=c) + 1 from t1;
call p1;
a (select d from t2 where b=c) + 1
1 4
3 2
1 4
3 2
3 2
4 7
4 7
5 NULL
5 NULL
4 7
call p1;
a (select d from t2 where b=c) + 1
1 4
3 2
1 4
3 2
3 2
4 7
4 7
5 NULL
5 NULL
4 7
drop procedure p1;
#IN subquery test
flush status;
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
select a, b , b in (select d from t2) as SUBS from t1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 4
insert into t1 values (7,8),(9,NULL);
select a, b , b in (select d from t2) as SUBS from t1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
7 8 0
9 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 12
Subquery_cache_miss 10
insert into t2 values (8,NULL);
select a, b , b in (select d from t2) as SUBS from t1;
a b SUBS
1 2 NULL
3 4 1
1 2 NULL
3 4 1
3 4 1
4 5 NULL
4 5 NULL
5 6 1
5 6 1
4 5 NULL
7 8 NULL
9 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 18
Subquery_cache_miss 16
# multicolumn NOT IN with NULLs
flush status;
set optimizer_switch='subquery_cache=off';
select a, b, (b, a) not in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 1
3 4 0
1 2 1
3 4 0
3 4 0
4 5 1
4 5 1
5 6 0
5 6 0
4 5 1
7 8 1
9 NULL 1
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
set optimizer_switch='subquery_cache=on';
select a, b, (b, a) not in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 1
3 4 0
1 2 1
3 4 0
3 4 0
4 5 1
4 5 1
5 6 0
5 6 0
4 5 1
7 8 1
9 NULL 1
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 6
# multicolumn NOT IN with NULLs (other order)
flush status;
set optimizer_switch='subquery_cache=off';
select a, b, (a, b) not in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 1
3 4 1
1 2 1
3 4 1
3 4 1
4 5 1
4 5 1
5 6 1
5 6 1
4 5 1
7 8 NULL
9 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
set optimizer_switch='subquery_cache=on';
select a, b, (a, b) not in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 1
3 4 1
1 2 1
3 4 1
3 4 1
4 5 1
4 5 1
5 6 1
5 6 1
4 5 1
7 8 NULL
9 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 6
# multicolumn IN with NULLs
flush status;
set optimizer_switch='subquery_cache=off';
select a, b, (b, a) in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
7 8 0
9 NULL 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
set optimizer_switch='subquery_cache=on';
select a, b, (b, a) in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
7 8 0
9 NULL 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 6
# multicolumn IN with NULLs (other order)
flush status;
set optimizer_switch='subquery_cache=off';
select a, b, (a, b) in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 0
3 4 0
1 2 0
3 4 0
3 4 0
4 5 0
4 5 0
5 6 0
5 6 0
4 5 0
7 8 NULL
9 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
set optimizer_switch='subquery_cache=on';
select a, b, (a, b) in (select d, c from t2) as SUBS from t1;
a b SUBS
1 2 0
3 4 0
1 2 0
3 4 0
3 4 0
4 5 0
4 5 0
5 6 0
5 6 0
4 5 0
7 8 NULL
9 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 6
#IN subquery test (PS)
delete from t1 where a > 6;
delete from t2 where c > 6;
prepare stmt1 from 'select a, b , b in (select d from t2) as SUBS from t1';
execute stmt1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 12
Subquery_cache_miss 10
execute stmt1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 18
Subquery_cache_miss 14
insert into t1 values (7,8),(9,NULL);
execute stmt1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL NULL
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 24
Subquery_cache_miss 20
execute stmt1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL NULL
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 30
Subquery_cache_miss 26
insert into t2 values (8,NULL);
execute stmt1;
a b SUBS
1 2 NULL
3 4 1
1 2 NULL
3 4 1
3 4 1
4 5 NULL
4 5 NULL
5 6 1
5 6 1
4 5 NULL
9 NULL NULL
7 8 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 36
Subquery_cache_miss 32
execute stmt1;
a b SUBS
1 2 NULL
3 4 1
1 2 NULL
3 4 1
3 4 1
4 5 NULL
4 5 NULL
5 6 1
5 6 1
4 5 NULL
9 NULL NULL
7 8 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 42
Subquery_cache_miss 38
deallocate prepare stmt1;
#IN subquery test (SP)
delete from t1 where a > 6;
delete from t2 where c > 6;
CREATE PROCEDURE p1() select a, b , b in (select d from t2) as SUBS from t1;
call p1();
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 48
Subquery_cache_miss 42
call p1();
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 54
Subquery_cache_miss 46
insert into t1 values (7,8),(9,NULL);
call p1();
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL NULL
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 60
Subquery_cache_miss 52
call p1();
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL NULL
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 66
Subquery_cache_miss 58
insert into t2 values (8,NULL);
call p1();
a b SUBS
1 2 NULL
3 4 1
1 2 NULL
3 4 1
3 4 1
4 5 NULL
4 5 NULL
5 6 1
5 6 1
4 5 NULL
9 NULL NULL
7 8 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 72
Subquery_cache_miss 64
call p1();
a b SUBS
1 2 NULL
3 4 1
1 2 NULL
3 4 1
3 4 1
4 5 NULL
4 5 NULL
5 6 1
5 6 1
4 5 NULL
9 NULL NULL
7 8 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 78
Subquery_cache_miss 70
drop procedure p1;
# test of simple exists
select a, b , exists (select * from t2 where b=d) as SUBS from t1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL 0
7 8 0
# test of prepared statement exists
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 84
Subquery_cache_miss 76
prepare stmt1 from 'select a, b , exists (select * from t2 where b=d) as SUBS from t1';
execute stmt1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL 0
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 90
Subquery_cache_miss 82
execute stmt1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL 0
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 96
Subquery_cache_miss 88
deallocate prepare stmt1;
# test of stored procedure exists
CREATE PROCEDURE p1() select a, b , exists (select * from t2 where b=d) as SUBS from t1;
call p1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL 0
7 8 0
call p1;
a b SUBS
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 1
5 6 1
4 5 0
9 NULL 0
7 8 0
drop procedure p1;
#several subqueries
set optimizer_switch='subquery_cache=off';
flush status;
select a, b , exists (select * from t2 where b=d) as SUBSE, b in (select d from t2) as SUBSI, (select d from t2 where b=c) SUBSR from t1;
a b SUBSE SUBSI SUBSR
1 2 0 NULL 3
3 4 1 1 1
1 2 0 NULL 3
3 4 1 1 1
3 4 1 1 1
4 5 0 NULL 6
4 5 0 NULL 6
5 6 1 1 NULL
5 6 1 1 NULL
4 5 0 NULL 6
9 NULL 0 NULL NULL
7 8 0 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 11
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 145
set optimizer_switch='subquery_cache=on';
flush status;
select a, b , exists (select * from t2 where b=d) as SUBSE, b in (select d from t2) as SUBSI, (select d from t2 where b=c) SUBSR from t1;
a b SUBSE SUBSI SUBSR
1 2 0 NULL 3
3 4 1 1 1
1 2 0 NULL 3
3 4 1 1 1
3 4 1 1 1
4 5 0 NULL 6
4 5 0 NULL 6
5 6 1 1 NULL
5 6 1 1 NULL
4 5 0 NULL 6
9 NULL 0 NULL NULL
7 8 0 NULL NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 18
Subquery_cache_miss 18
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 32
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 84
#several subqueries (several levels)
set optimizer_switch='subquery_cache=off';
flush status;
set optimizer_switch='subquery_cache=off';
flush status;
select a, b, (select exists (select * from t2 where b=d) from t2 where b=c) as SUNS1 from t1;
a b SUNS1
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 NULL
5 6 NULL
4 5 0
9 NULL NULL
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 127
set optimizer_switch='subquery_cache=on';
flush status;
select a, b, (select exists (select * from t2 where b=d) from t2 where b=c) as SUNS1 from t1;
a b SUNS1
1 2 0
3 4 1
1 2 0
3 4 1
3 4 1
4 5 0
4 5 0
5 6 NULL
5 6 NULL
4 5 0
9 NULL NULL
7 8 0
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 6
Subquery_cache_miss 10
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 13
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 69
#clean up
drop table t1,t2;
test different types
#int
CREATE TABLE t1 ( a int, b int);
INSERT INTO t1 VALUES(1,1),(2,2),(3,3);
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = 2);
a
1
3
DROP TABLE t1;
#char
CREATE TABLE t1 ( a char(1), b char (1));
INSERT INTO t1 VALUES('1','1'),('2','2'),('3','3');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2');
a
1
3
DROP TABLE t1;
#decimal
CREATE TABLE t1 ( a decimal(3,1), b decimal(3,1));
INSERT INTO t1 VALUES(1,1),(2,2),(3,3);
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = 2);
a
1.0
3.0
DROP TABLE t1;
#date
CREATE TABLE t1 ( a date, b date);
INSERT INTO t1 VALUES('1000-01-01','1000-01-01'),('2000-02-01','2000-02-01'),('3000-03-03','3000-03-03');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2000-02-01');
a
1000-01-01
3000-03-03
DROP TABLE t1;
#datetime
CREATE TABLE t1 ( a datetime, b datetime);
INSERT INTO t1 VALUES('1000-01-01 01:01:01','1000-01-01 01:01:01'),('2000-02-02 02:02:02','2000-02-02 02:02:02'),('3000-03-03 03:03:03','3000-03-03 03:03:03');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2000-02-02 02:02:02');
a
1000-01-01 01:01:01
3000-03-03 03:03:03
DROP TABLE t1;
#time
CREATE TABLE t1 ( a time, b time);
INSERT INTO t1 VALUES('01:01:01','01:01:01'),('02:02:02','02:02:02'),('03:03:03','03:03:03');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '02:02:02');
a
01:01:01
03:03:03
DROP TABLE t1;
#timestamp
CREATE TABLE t1 ( a timestamp, b timestamp);
INSERT INTO t1 VALUES('2000-02-02 01:01:01','2000-02-02 01:01:01'),('2000-02-02 02:02:02','2000-02-02 02:02:02'),('2000-02-02 03:03:03','2000-02-02 03:03:03');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2000-02-02 02:02:02');
a
2000-02-02 01:01:01
2000-02-02 03:03:03
DROP TABLE t1;
#bit
CREATE TABLE t1 ( a bit(20), b bit(20));
INSERT INTO t1 VALUES(1,1),(2,2),(3,3);
SELECT a+0 FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = 2);
a+0
1
3
DROP TABLE t1;
#enum
CREATE TABLE t1 ( a enum('1','2','3'), b enum('1','2','3'));
INSERT INTO t1 VALUES('1','1'),('2','2'),('3','3');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2');
a
1
3
DROP TABLE t1;
#set
CREATE TABLE t1 ( a set('1','2','3'), b set('1','2','3'));
INSERT INTO t1 VALUES('1','1'),('2','2'),('3','3');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2');
a
1
3
DROP TABLE t1;
#blob
CREATE TABLE t1 ( a blob, b blob);
INSERT INTO t1 VALUES('1','1'),('2','2'),('3','3');
SELECT a FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = '2');
a
1
3
DROP TABLE t1;
#geometry
CREATE TABLE t1 ( a geometry, b geometry);
INSERT INTO t1 VALUES(POINT(1,1),POINT(1,1)),(POINT(2,2),POINT(2,2)),(POINT(3,3),POINT(3,3));
SELECT astext(a) FROM t1 WHERE NOT a IN (SELECT a FROM t1 WHERE b = POINT(2,2));
astext(a)
POINT(1 1)
POINT(3 3)
DROP TABLE t1;
#uncacheable queries test (random and side effect)
flush status;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (2), (4), (1), (3);
select a, a in (select a from t1) from t1 as ext;
a a in (select a from t1)
2 1
4 1
1 1
3 1
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 4
select a, a in (select a from t1 where -1 < rand()) from t1 as ext;
a a in (select a from t1 where -1 < rand())
2 1
4 1
1 1
3 1
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 4
select a, a in (select a from t1 where -1 < benchmark(a,100)) from t1 as ext;
a a in (select a from t1 where -1 < benchmark(a,100))
2 1
4 1
1 1
3 1
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 4
drop table t1;
#test of sql_big_tables switch and outer table reference in subquery with grouping
set option sql_big_tables=1;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1),(2,1),(3,2),(4,2),(5,3),(6,3);
SELECT (SELECT t1_outer.a FROM t1 AS t1_inner GROUP BY b LIMIT 1) FROM t1 AS t1_outer;
(SELECT t1_outer.a FROM t1 AS t1_inner GROUP BY b LIMIT 1)
1
2
3
4
5
6
drop table t1;
set option sql_big_tables=0;
#test of function reference to outer query
set local group_concat_max_len=400;
create table t2 (a int, b int);
insert into t2 values (1,1), (2,2);
select b x, (select group_concat(x) from t2) from t2;
x (select group_concat(x) from t2)
1 1,1
2 2,2
drop table t2;
set local group_concat_max_len=default;
#aggregate functions
CREATE TABLE t1 (a int, b INT);
CREATE TABLE t2 (c int, d INT);
insert into t1 values (2,1), (3,1), (2,4), (3,4), (10,2), (20,2), (2,5),
(3,5), (100,3), (200,3), (10,6), (20,6), (20,7), (100,8), (200,8);
insert into t2 values (1,1),(3,3),(20,20);
aggregate function as parameter of subquery
set optimizer_switch='subquery_cache=off';
flush status;
select max(a), (select max(a) from t2 where max(a)=c) from t1 group by b;
max(a) (select max(a) from t2 where max(a)=c)
3 3
20 20
200 NULL
3 3
3 3
20 20
20 20
200 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 15
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 8
Handler_read_rnd_next 57
set optimizer_switch='subquery_cache=on';
flush status;
select max(a), (select max(a) from t2 where max(a)=c) from t1 group by b;
max(a) (select max(a) from t2 where max(a)=c)
3 3
20 20
200 NULL
3 3
3 3
20 20
20 20
200 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 5
Subquery_cache_miss 3
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 21
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 8
Handler_read_rnd_next 37
argument of aggregate function as parameter of subquery (illegal use)
set optimizer_switch='subquery_cache=off';
flush status;
select max(a), (select a from t2 where a=c) from t1 group by b;
max(a) (select a from t2 where a=c)
3 NULL
20 NULL
200 NULL
3 NULL
3 NULL
20 NULL
20 20
200 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 15
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 8
Handler_read_rnd_next 57
set optimizer_switch='subquery_cache=on';
flush status;
select max(a), (select a from t2 where a=c) from t1 group by b;
max(a) (select a from t2 where a=c)
3 NULL
20 NULL
200 NULL
3 NULL
3 NULL
20 NULL
20 20
200 NULL
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 4
Subquery_cache_miss 4
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 22
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 8
Handler_read_rnd_next 41
drop table t1,t2;
#test of flattening subquery optimisations and cache
create table t0 (a int);
insert into t0 values (9),(8),(7),(6),(5),(4),(3),(2),(1),(0);
create table t1(a int, b int);
insert into t1 values
(0,0),(1,1),(2,2),(0,0),(1,1),(2,2),(0,0),(1,1),(2,2),(0,0),(1,1),(2,2),(0,0),(1,1),(2,2);
create table t2 (pk int, a int, primary key(pk));
insert into t2 select a,a from t0;
set optimizer_switch='default,semijoin=on,materialization=on,subquery_cache=on';
flush status;
select * from t1 where a in (select pk from t2);
a b
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 15
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 16
alter table t2 drop primary key;
set optimizer_switch='default,semijoin=off,materialization=off,subquery_cache=off';
explain select * from t1 where a in (select pk from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 15 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 10 Using where
flush status;
select * from t1 where a in (select pk from t2);
a b
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 0
Subquery_cache_miss 0
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 151
set optimizer_switch='default,semijoin=off,materialization=off,subquery_cache=on';
explain select * from t1 where a in (select pk from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 15 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 10 Using where
flush status;
select * from t1 where a in (select pk from t2);
a b
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 12
Subquery_cache_miss 3
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 15
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 43
set optimizer_switch='default,semijoin=off,materialization=on,subquery_cache=on';
explain select * from t1 where a in (select pk from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 15 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 10
flush status;
select * from t1 where a in (select pk from t2);
a b
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
0 0
1 1
2 2
show status like "subquery_cache%";
Variable_name Value
Subquery_cache_hit 12
Subquery_cache_miss 3
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 18
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 27
drop table t0,t1,t2;
set optimizer_switch='default';
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