mariadb/mysql-test/t/derived_view.test

--disable_warnings
drop table if exists t1,t2;
drop view if exists v1,v2,v3,v4;
--enable_warnings
create table t1(f1 int, f11 int);
create table t2(f2 int, f22 int);
insert into t1 values(1,1),(2,2),(3,3),(5,5),(9,9),(7,7);
insert into t1 values(17,17),(13,13),(11,11),(15,15),(19,19);
insert into t2 values(1,1),(3,3),(2,2),(4,4),(8,8),(6,6);
insert into t2 values(12,12),(14,14),(10,10),(18,18),(16,16);

--echo Tests:

--echo for merged derived tables
--echo  explain for simple derived
explain select * from (select * from t1) tt;
select * from (select * from t1) tt;
--echo  explain for multitable derived
explain extended select * from (select * from t1 join t2 on f1=f2) tt;
select * from (select * from t1 join t2 on f1=f2) tt;
--echo  explain for derived with where
explain extended 
  select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
--echo join of derived
explain extended 
  select * from (select * from t1 where f1 in (2,3)) tt join
  (select * from t1 where f1 in (1,2)) aa on tt.f1=aa.f1;
select * from (select * from t1 where f1 in (2,3)) tt join
  (select * from t1 where f1 in (1,2)) aa on tt.f1=aa.f1;

flush status;
explain extended 
  select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
show status like 'Handler_read%';
flush status;
select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
show status like 'Handler_read%';

--echo for merged views
create view v1 as select * from t1;
create view v2 as select * from t1 join t2 on f1=f2;
create view v3 as select * from t1 where f1 in (2,3);
create view v4 as select * from t2 where f2 in (2,3);
--echo  explain for simple views
explain extended select * from v1;
select * from v1;
--echo  explain for multitable views
explain extended select * from v2;
select * from v2;
--echo  explain for views with where
explain extended select * from v3 where f11 in (1,3);
select * from v3 where f11 in (1,3);
--echo explain for joined views
explain extended
  select * from v3 join v4 on f1=f2;
select * from v3 join v4 on f1=f2;

flush status;
explain extended select * from v4 where f2 in (1,3);
show status like 'Handler_read%';
flush status;
select * from v4 where f2 in (1,3);
show status like 'Handler_read%';

--echo for materialized derived tables
--echo  explain for simple derived
explain extended select * from (select * from t1 group by f1) tt;
select * from (select * from t1 having f1=f1) tt;
--echo  explain showing created indexes
explain extended 
  select * from t1 join (select * from t2 group by f2) tt on f1=f2;
select * from t1 join (select * from t2 group by f2) tt on f1=f2;
--echo  explain showing late materialization
flush status;
explain select * from t1 join (select * from t2 group by f2) tt on f1=f2;
show status like 'Handler_read%';
flush status;
select * from t1 join (select * from t2 group by f2) tt on f1=f2;
show status like 'Handler_read%';

--echo for materialized views
drop view v1,v2,v3;
create view v1 as select * from t1 group by f1;
create view v2 as select * from t2 group by f2;
create view v3 as select t1.f1,t1.f11 from t1 join t1 as t11 where t1.f1=t11.f1
                    having t1.f1<100;
--echo  explain for simple derived
explain extended select * from v1;
select * from v1;
--echo  explain showing created indexes
explain extended select * from t1 join v2 on f1=f2;
select * from t1 join v2 on f1=f2;
explain extended
  select * from t1,v3 as v31,v3 where t1.f1=v31.f1 and t1.f1=v3.f1;
flush status;
select * from t1,v3 as v31,v3 where t1.f1=v31.f1 and t1.f1=v3.f1;
show status like 'Handler_read%';
--echo  explain showing late materialization
flush status;
explain select * from t1 join v2 on f1=f2;
show status like 'Handler_read%';
flush status;
select * from t1 join v2 on f1=f2;
show status like 'Handler_read%';

explain extended select * from v1 join v4 on f1=f2;
select * from v1 join v4 on f1=f2;

--echo merged derived in merged derived
explain extended select * from (select * from 
  (select * from t1 where f1 < 7) tt where f1 > 2) zz;
select * from (select * from 
  (select * from t1 where f1 < 7) tt where f1 > 2) zz;

--echo materialized derived in merged derived
explain extended  select * from (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
select * from (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;

--echo merged derived in materialized derived
explain  extended select * from (select * from 
  (select * from t1 where f1 < 7) tt where f1 > 2 group by f1) zz;
select * from (select * from 
  (select * from t1 where f1 < 7) tt where f1 > 2 group by f1) zz;

--echo materialized derived in materialized derived
explain extended  select * from (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
select * from (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;

--echo mat in merged derived join mat in merged derived
explain extended  select * from 
 (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
join 
 (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
 on x.f1 = z.f1;

flush status;
select * from 
 (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
join 
 (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
 on x.f1 = z.f1;
show status like 'Handler_read%';
flush status;

--echo merged in merged derived join merged in merged derived
explain extended  select * from 
 (select * from 
  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) x
join 
 (select * from 
  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) z
 on x.f1 = z.f1;

select * from 
 (select * from 
  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) x
join 
 (select * from 
  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) z
 on x.f1 = z.f1;

--echo materialized in materialized derived join 
--echo   materialized in materialized derived
explain extended  select * from 
 (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
join 
 (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
 on x.f1 = z.f1;

select * from 
 (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
join 
 (select * from 
  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
 on x.f1 = z.f1;

--echo merged view in materialized derived
explain extended
select * from (select * from v4 group by 1) tt;
select * from (select * from v4 group by 1) tt;

--echo materialized view in merged derived
explain extended 
select * from ( select * from v1 where f1 < 7) tt;
select * from ( select * from v1 where f1 < 7) tt;

--echo merged view in a merged view in a merged derived
create view v6 as select * from v4 where f2 < 7;
explain extended select * from (select * from v6) tt;
select * from (select * from v6) tt;

--echo materialized view in a merged view in a materialized derived
create view v7 as select * from v1;
explain extended select * from (select * from v7 group by 1) tt;
select * from (select * from v7 group by 1) tt;

--echo join of above two
explain extended select * from v6 join v7 on f2=f1;
select * from v6 join v7 on f2=f1;

--echo test two keys
explain select * from t1 join (select * from t2 group by f2) tt on t1.f1=tt.f2 join t1 xx on tt.f22=xx.f1;
select * from t1 join (select * from t2 group by f2) tt on t1.f1=tt.f2 join t1 xx on tt.f22=xx.f1;


--echo TODO: Add test with 64 tables mergeable view to test fall back to
--echo materialization on tables > MAX_TABLES merge
drop table t1,t2;
drop view v1,v2,v3,v4,v6,v7;

--echo #
--echo #  LP bug #794909: crash when defining possible keys for
--echo #                  a materialized view/derived_table
--echo #

CREATE TABLE t1 (f1 int) ;
INSERT INTO t1 VALUES (149), (150), (224), (29);

CREATE TABLE t2 (f1 int, KEY (f1));
INSERT INTO t2 VALUES (149), (NULL), (224);

CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;

EXPLAIN
SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;
SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;

DROP VIEW v1;
DROP TABLE t1,t2;