SET @@session.storage_engine = 'MyISAM';
create table t1 (a int not null,
b int as (-a), 
c int as (-a) persistent);
insert into t1 (a) values (1), (1), (2), (2), (3);
create view v1 (d,e) as select abs(b), abs(c) from t1;
select d,e from v1;
d	e
1	1
1	1
2	2
2	2
3	3
select is_updatable from information_schema.views where table_name='v1';
is_updatable
NO
explain extended select d,e from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	
Warnings:
Note	1003	select abs(`test`.`t1`.`b`) AS `d`,abs(`test`.`t1`.`c`) AS `e` from `test`.`t1`
create algorithm=temptable view v2 (d,e) as select abs(b), abs(c) from t1;
show create view v2;
View	Create View	character_set_client	collation_connection
v2	CREATE ALGORITHM=TEMPTABLE DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select abs(`t1`.`b`) AS `d`,abs(`t1`.`c`) AS `e` from `t1`	latin1	latin1_swedish_ci
select d,e from v2;
d	e
1	1
1	1
2	2
2	2
3	3
explain extended select d,e from v2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	
Warnings:
Note	1003	select `v2`.`d` AS `d`,`v2`.`e` AS `e` from `test`.`v2`
create view v3 (d,e) as select d*2, e*2 from v1;
select * from v3;
d	e
2	2
2	2
4	4
4	4
6	6
explain extended select * from v3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	
Warnings:
Note	1003	select (abs(`test`.`t1`.`b`) * 2) AS `d`,(abs(`test`.`t1`.`c`) * 2) AS `e` from `test`.`t1`
drop view v1,v2,v3;
drop table t1;
create table t1 (a int not null,
b int as (-a), 
c int as (-a) persistent);
insert into t1 (a) values (1), (2), (3), (1), (2), (3);
create view v1 as select distinct b from t1;
select * from v1;
b
-1
-2
-3
explain select * from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
select * from t1;
a	b	c
1	-1	-1
2	-2	-2
3	-3	-3
1	-1	-1
2	-2	-2
3	-3	-3
drop view v1;
create view v1 as select distinct c from t1;
select * from v1;
c
-1
-2
-3
explain select * from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
select * from t1;
a	b	c
1	-1	-1
2	-2	-2
3	-3	-3
1	-1	-1
2	-2	-2
3	-3	-3
drop view v1;
drop table t1;
create table t1 (a int not null,
b int as (-a), 
c int as (-a) persistent);
insert into t1 (a) values (1), (2), (3), (4);
create view v1 as select b+1 from t1 order by 1 desc limit 2;
select * from v1;
b+1
0
-1
MariaDB-5.3: the following EXPLAIN produces incorrect #rows for table t1.
MariaDB-5.3: this is expected to go away when FROM subquery optimizations are pushed
explain select * from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
drop view v1;
create view v1 as select c+1 from t1 order by 1 desc limit 2;
select * from v1;
c+1
0
-1
MariaDB-5.3: the following EXPLAIN produces incorrect #rows for table t1.
MariaDB-5.3: this is expected to go away when FROM subquery optimizations are pushed
explain select * from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
drop view v1;
drop table t1;
create table t1 (a int,
b int,
c int as (-a),
d int as (-a) persistent,
primary key(a));
insert into t1 (a,b) values (10,2), (20,3), (30,4), (40,5), (50,10);
create view v1 (a,e,f,g) as select a, b+1,c+1,d+1 from t1;
update v1 set a=a+e;
select * from v1;
a	e	f	g
13	3	-12	-12
24	4	-23	-23
35	5	-34	-34
46	6	-45	-45
61	11	-60	-60
select * from t1;
a	b	c	d
13	2	-13	-13
24	3	-24	-24
35	4	-35	-35
46	5	-46	-46
61	10	-61	-61
delete from v1;
select * from v1;
a	e	f	g
select * from t1;
a	b	c	d
insert into v1 (a,e) values (60,15);
ERROR HY000: The target table v1 of the INSERT is not insertable-into
drop table t1;
drop view v1;
SET @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='outer_join_with_cache=off';
create table t1 (a int, 
b int as (-a),
c int as (-a) persistent,
primary key(a));
insert into t1 (a) values (1), (2), (3);
create view v1 (x,y,z) as select a,b,c from t1 where b < -1;
select t1.a, v1.x, v1.y, v1.z from t1 left join v1 on (t1.b= v1.y);
a	x	y	z
1	NULL	NULL	NULL
2	2	-2	-2
3	3	-3	-3
drop view v1;
create view v1 (x,y,z) as select a,b,c from t1 where c < -1;
select t1.a, v1.x, v1.y, v1.z from t1 left join v1 on (t1.c= v1.z);
a	x	y	z
1	NULL	NULL	NULL
2	2	-2	-2
3	3	-3	-3
drop view v1;
drop table t1;
SET optimizer_switch=@save_optimizer_switch;
create table t1 (a1 int,
b1 int as (-a1),
c1 int as (-a1) persistent);
create table t2 (a2 int,
b2 int as (-a2),
c2 int as (-a2) persistent);
insert into t1 (a1) values (1), (2);
insert into t2 (a2) values (2), (3);
create view v1 as select * from t1,t2 union all select * from t1,t2;
select * from v1;
a1	b1	c1	a2	b2	c2
1	-1	-1	2	-2	-2
2	-2	-2	2	-2	-2
1	-1	-1	3	-3	-3
2	-2	-2	3	-3	-3
1	-1	-1	2	-2	-2
2	-2	-2	2	-2	-2
1	-1	-1	3	-3	-3
2	-2	-2	3	-3	-3
drop view v1;
drop table t1, t2;
create table t1 (a int,
b int as (-a),
c int as (-a) persistent);
create table t2 like t1;
create view v1 as select a,b,c from t1;
create view v2 as select a,b,c from t2 where b in (select b from v1);
show create view v2;
View	Create View	character_set_client	collation_connection
v2	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select `t2`.`a` AS `a`,`t2`.`b` AS `b`,`t2`.`c` AS `c` from `t2` where `t2`.`b` in (select `v1`.`b` from `v1`)	latin1	latin1_swedish_ci
drop view v2, v1;
drop table t1, t2;
create table t1 (a int,
b int as (-a),
c int as (-a) persistent);
insert into t1 (a) values (1),(1),(2),(2),(3),(3);
create view v1 as select b from t1;
select distinct b from v1;
b
-1
-2
-3
select distinct b from v1 limit 2;
b
-1
-2
select distinct b from t1 limit 2;
b
-1
-2
prepare stmt1 from "select distinct b from v1 limit 2";
execute stmt1;
b
-1
-2
execute stmt1;
b
-1
-2
deallocate prepare stmt1;
drop view v1;
create view v1 as select c from t1;
select distinct c from v1;
c
-1
-2
-3
select distinct c from v1 limit 2;
c
-1
-2
select distinct c from t1 limit 2;
c
-1
-2
prepare stmt1 from "select distinct c from v1 limit 2";
execute stmt1;
c
-1
-2
execute stmt1;
c
-1
-2
deallocate prepare stmt1;
drop view v1;
drop table t1;
create table t1 (a int,
b int as (-a),
c int as (-a) persistent);
create view v1 as select * from t1 where b > -2 && c >-2 with check option;
insert into v1 (a) values (1);
insert into v1 (a) values (3);
ERROR HY000: CHECK OPTION failed 'test.v1'
insert ignore into v1 (a) values (2),(3),(0);
Warnings:
Warning	1369	CHECK OPTION failed 'test.v1'
Warning	1369	CHECK OPTION failed 'test.v1'
select * from t1;
a	b	c
1	-1	-1
0	0	0
drop view v1;
drop table t1;
