mariadb/mysql-test/r/opt_tvc.result

create table t1 (a int, b int);
insert into t1
values (1,2), (4,6), (9,7),
(1,1), (2,5), (7,8);
create table t2 (a int, b int, c int);
insert into t2
values (1,2,3), (5,1,2), (4,3,7),
(8,9,0), (10,7,1), (5,5,1);
create table t3 (a int, b varchar(16), index idx(a));
insert into t3 values
(1, "abc"), (3, "egh"), (8, "axxx"), (10, "abc"),
(2, "ccw"), (8, "wqqe"), (7, "au"), (9, "waa"),
(3, "rass"), (9, "ert"), (9, "lok"), (8, "aww"),
(1, "todd"), (3, "rew"), (8, "aww"), (3, "sw"),
(11, "llk"), (7, "rbw"), (1, "sm"), (2, "jyp"),
(4, "yq"), (5, "pled"), (12, "ligin"), (12, "toww"),
(6, "mxm"), (15, "wanone"), (9, "sunqq"), (2, "abe");
# optimization is not used
select * from t1 where a in (1,2);
a	b
1	2
1	1
2	5
explain extended select * from t1 where a in (1,2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where
Warnings:
Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where `test`.`t1`.`a` in (1,2)
# set minimum number of values in VALUEs list when optimization works to 2
set @@in_subquery_conversion_threshold= 2;
# single IN-predicate in WHERE-part
select * from t1 where a in (1,2);
a	b
1	2
1	1
2	5
select * from t1
where a in
(
select *
from (values (1),(2)) as tvc_0
);
a	b
1	2
1	1
2	5
explain extended select * from t1 where a in (1,2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
explain extended select * from t1
where a in
(
select *
from (values (1),(2)) as tvc_0
);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
# AND-condition with IN-predicates in WHERE-part
select * from t1
where a in (1,2) and
b in (1,5);
a	b
1	1
2	5
select * from t1
where a in
(
select *
from (values (1),(2)) as tvc_0
)
and b in
(
select *
from (values (1),(5)) as tvc_1
);
a	b
1	1
2	5
explain extended select * from t1
where a in (1,2) and
b in (1,5);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery4>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
4	MATERIALIZED	<derived5>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
5	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) semi join ((values (1),(5)) `tvc_1`) where `test`.`t1`.`b` = `tvc_1`.`1`
explain extended select * from t1
where a in
(
select *
from (values (1),(2)) as tvc_0
)
and b in
(
select *
from (values (1),(5)) as tvc_1
);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery4>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
4	MATERIALIZED	<derived5>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
5	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) semi join ((values (1),(5)) `tvc_1`) where `test`.`t1`.`b` = `tvc_1`.`1`
# subquery with IN-predicate
select * from t1
where a in
(
select a
from t2 where b in (3,4)
);
a	b
4	6
select * from t1
where a in
(
select a from t2
where b in
(
select *
from (values (3),(4)) as tvc_0
)
);
a	b
4	6
explain extended select * from t1
where a in
(
select a
from t2 where b in (3,4)
);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
2	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (3),(4)) `tvc_0` join `test`.`t2`) where `test`.`t2`.`b` = `tvc_0`.`3`
explain extended select * from t1
where a in
(
select a from t2
where b in
(
select *
from (values (3),(4)) as tvc_0
)
);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
2	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (3),(4)) `tvc_0` join `test`.`t2`) where `test`.`t2`.`b` = `tvc_0`.`3`
# derived table with IN-predicate
select * from
(
select *
from t1
where a in (1,2)
) as dr_table;
a	b
1	2
1	1
2	5
select * from
(
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
) as dr_table;
a	b
1	2
1	1
2	5
explain extended select * from
(
select *
from t1
where a in (1,2)
) as dr_table;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
explain extended select * from
(
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
) as dr_table;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
# non-recursive CTE with IN-predicate
with tvc_0 as
(
select *
from t1
where a in (1,2)
)
select * from tvc_0;
a	b
1	2
1	1
2	5
select * from
(
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
) as dr_table;
a	b
1	2
1	1
2	5
explain extended with tvc_0 as
(
select *
from t1
where a in (1,2)
)
select * from tvc_0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	with tvc_0 as (/* select#2 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` in (1,2))/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
explain extended select * from
(
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
) as dr_table;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
# VIEW with IN-predicate
create view v1 as
select *
from t1
where a in (1,2);
create view v2 as
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
;
select * from v1;
a	b
1	2
1	1
2	5
select * from v2;
a	b
1	2
1	1
2	5
explain extended select * from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
explain extended select * from v2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1`
drop view v1,v2;
# subselect defined by derived table with IN-predicate
select * from t1
where a in
(
select 1
from
(
select *
from t1
where a in (1,2)
)
as dr_table
);
a	b
1	2
1	1
select * from t1
where a in
(
select 1
from
(
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
)
as dr_table
);
a	b
1	2
1	1
explain extended select * from t1
where a in
(
select 1
from
(
select *
from t1
where a in (1,2)
)
as dr_table
);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
2	MATERIALIZED	<derived5>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
5	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0` join `test`.`t1`) where `test`.`t1`.`a` = 1 and `test`.`t1`.`a` = `tvc_0`.`1`
explain extended select * from t1
where a in
(
select 1
from
(
select *
from t1
where a in
(
select *
from (values (1),(2))
as tvc_0
)
)
as dr_table
);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
2	MATERIALIZED	<derived5>	ALL	NULL	NULL	NULL	NULL	2	100.00	
2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
5	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1),(2)) `tvc_0` join `test`.`t1`) where `test`.`t1`.`a` = 1 and `test`.`t1`.`a` = `tvc_0`.`1`
# derived table with IN-predicate and group by
select * from
(
select max(a),b
from t1
where b in (3,5)
group by b
) as dr_table;
max(a)	b
2	5
select * from
(
select max(a),b
from t1
where b in
(
select *
from (values (3),(5))
as tvc_0
)
group by b
) as dr_table;
max(a)	b
2	5
explain extended select * from
(
select max(a),b
from t1
where b in (3,5)
group by b
) as dr_table;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	12	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using temporary; Using filesort
2	DERIVED	<subquery3>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `dr_table`.`max(a)` AS `max(a)`,`dr_table`.`b` AS `b` from (/* select#2 */ select max(`test`.`t1`.`a`) AS `max(a)`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (3),(5)) `tvc_0`) where 1 group by `test`.`t1`.`b`) `dr_table`
explain extended select * from
(
select max(a),b
from t1
where b in
(
select *
from (values (3),(5))
as tvc_0
)
group by b
) as dr_table;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	12	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using temporary; Using filesort
2	DERIVED	<subquery3>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
3	MATERIALIZED	<derived4>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `dr_table`.`max(a)` AS `max(a)`,`dr_table`.`b` AS `b` from (/* select#2 */ select max(`test`.`t1`.`a`) AS `max(a)`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (3),(5)) `tvc_0`) where 1 group by `test`.`t1`.`b`) `dr_table`
# prepare statement
prepare stmt from "select * from t1 where a in (1,2)";
execute stmt;
a	b
1	2
1	1
2	5
execute stmt;
a	b
1	2
1	1
2	5
deallocate prepare stmt;
# use inside out access from tvc rows
set @@in_subquery_conversion_threshold= default;
select * from t3 where a in (1,4,10);
a	b
1	abc
1	todd
1	sm
4	yq
10	abc
explain extended select * from t3 where a in (1,4,10);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t3	range	idx	idx	5	NULL	5	100.00	Using index condition
Warnings:
Note	1003	select `test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b` from `test`.`t3` where `test`.`t3`.`a` in (1,4,10)
set @@in_subquery_conversion_threshold= 2;
select * from t3 where a in (1,4,10);
a	b
1	abc
1	todd
1	sm
4	yq
10	abc
explain extended select * from t3 where a in (1,4,10);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t3	ref	idx	idx	5	tvc_0.1	3	100.00	
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b` from `test`.`t3` semi join ((values (1),(4),(10)) `tvc_0`) where `test`.`t3`.`a` = `tvc_0`.`1`
# use vectors in IN predeicate
set @@in_subquery_conversion_threshold= 4;
select * from t1 where (a,b) in ((1,2),(3,4));
a	b
1	2
explain extended select * from t1 where (a,b) in ((1,2),(3,4));
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` semi join ((values (1,2),(3,4)) `tvc_0`) where `test`.`t1`.`a` = `tvc_0`.`1` and `test`.`t1`.`b` = `tvc_0`.`2`
set @@in_subquery_conversion_threshold= 2;
# trasformation works for the one IN predicate and doesn't work for the other
set @@in_subquery_conversion_threshold= 5;
select * from t2
where (a,b) in ((1,2),(8,9)) and
(a,c) in ((1,3),(8,0),(5,1));
a	b	c
1	2	3
8	9	0
explain extended select * from t2
where (a,b) in ((1,2),(8,9)) and
(a,c) in ((1,3),(8,0),(5,1));
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	2	100.00	
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where; Using join buffer (flat, BNL join)
2	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` semi join ((values (1,3),(8,0),(5,1)) `tvc_0`) where `test`.`t2`.`a` = `tvc_0`.`1` and `test`.`t2`.`c` = `tvc_0`.`3` and (`tvc_0`.`1`,`test`.`t2`.`b`) in (<cache>((1,2)),<cache>((8,9)))
set @@in_subquery_conversion_threshold= 2;
drop table t1, t2, t3;
set @@in_subquery_conversion_threshold= default;