SET DEFAULT_STORAGE_ENGINE = 'tokudb';
DROP TABLE IF EXISTS foo;
create table foo (a int, b int, c int, primary key (a,b));
insert into foo values (1,10,100),(2,20,200),(3,30,300),(4,40,400),(5,50,500),(6,60,600);
insert into foo values (1,100,100),(2,200,200),(3,300,300),(4,400,400),(5,500,500),(6,600,600);
select * from foo;
a	b	c
1	10	100
1	100	100
2	20	200
2	200	200
3	30	300
3	300	300
4	40	400
4	400	400
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a=4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	ref	PRIMARY	PRIMARY	4	const	NULL;	
select * from foo where a=4;
a	b	c
4	40	400
4	400	400
explain select * from foo where a>4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	PRIMARY	PRIMARY	4	NULL	NULL;	Using where
select * from foo where a>4;
a	b	c
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a<3 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	PRIMARY	PRIMARY	4	NULL	NULL;	Using where
select * from foo where a<3 order by a desc;
a	b	c
2	200	200
2	20	200
1	100	100
1	10	100
explain select * from foo where a>=4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	PRIMARY	PRIMARY	4	NULL	NULL;	Using where
select * from foo where a>=4;
a	b	c
4	40	400
4	400	400
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a<=2 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	PRIMARY	PRIMARY	4	NULL	NULL;	Using where
select * from foo where a<=2 order by a desc;
a	b	c
2	200	200
2	20	200
1	100	100
1	10	100
explain select * from foo where a=4 order by b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	ref	PRIMARY	PRIMARY	4	const	NULL;	Using where
select * from foo where a=4 order by b desc;
a	b	c
4	400	400
4	40	400
alter table foo drop primary key;
alter table foo add clustering index clst_a(a,b);
explain select * from foo where a=4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	ref	clst_a	clst_a	4	const	NULL;	
select * from foo where a=4;
a	b	c
4	40	400
4	400	400
explain select * from foo where a>4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	clst_a	clst_a	4	NULL	NULL;	Using where
select * from foo where a>4;
a	b	c
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a<3 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	clst_a	clst_a	4	NULL	NULL;	Using where
select * from foo where a<3 order by a desc;
a	b	c
2	200	200
2	20	200
1	100	100
1	10	100
explain select * from foo where a>=4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	clst_a	clst_a	4	NULL	NULL;	Using where
select * from foo where a>=4;
a	b	c
4	40	400
4	400	400
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a<=2 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	clst_a	clst_a	4	NULL	NULL;	Using where
select * from foo where a<=2 order by a desc;
a	b	c
2	200	200
2	20	200
1	100	100
1	10	100
explain select * from foo where a=4 order by b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	ref	clst_a	clst_a	4	const	NULL;	Using where
select * from foo where a=4 order by b desc;
a	b	c
4	400	400
4	40	400
alter table foo drop index clst_a;
alter table foo add index (a,b);
explain select * from foo where a=4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	ref	a	a	4	const	NULL;	
select * from foo where a=4;
a	b	c
4	40	400
4	400	400
explain select * from foo where a>4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	a	a	4	NULL	NULL;	Using where
select * from foo where a>4;
a	b	c
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a<3 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	a	a	4	NULL	NULL;	Using where
select * from foo where a<3 order by a desc;
a	b	c
2	200	200
2	20	200
1	100	100
1	10	100
explain select * from foo where a>=4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	a	a	4	NULL	NULL;	Using where
select * from foo where a>=4;
a	b	c
4	40	400
4	400	400
5	50	500
5	500	500
6	60	600
6	600	600
explain select * from foo where a<=2 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	range	a	a	4	NULL	NULL;	Using where
select * from foo where a<=2 order by a desc;
a	b	c
2	200	200
2	20	200
1	100	100
1	10	100
explain select * from foo where a=4 order by b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	foo	ref	a	a	4	const	NULL;	Using where
select * from foo where a=4 order by b desc;
a	b	c
4	400	400
4	40	400
DROP TABLE foo;