mariadb/mysql-test/t/merge.test

#
# test of MERGE TABLES
#

drop table if exists t1,t2,t3;
create table t1 (a int not null primary key auto_increment, message char(20));
create table t2 (a int not null primary key auto_increment, message char(20));
INSERT INTO t1 (message) VALUES ("Testing"),("table"),("t1");
INSERT INTO t2 (message) VALUES ("Testing"),("table"),("t2");
create table t3 (a int not null, b char(20), key(a)) type=MERGE UNION=(t1,t2);
select * from t3;
select * from t3 order by a desc;
drop table t3;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
create table t3 (a int not null, b char(20), key(a)) type=MERGE UNION=(t1,t2);
explain select * from t3 where a < 10;
explain select * from t3 where a > 10 and a < 20;
select * from t3 where a = 10;
select * from t3 where a < 10;
select * from t3 where a > 10 and a < 20;
explain select a from t3 order by a desc limit 10;
select a from t3 order by a desc limit 10;
select a from t3 order by a desc limit 300,10;
show create table t3;

# The following should give errors
create table t4 (a int not null, b char(10), key(a)) type=MERGE UNION=(t1,t2);

# Because of windows, it's important that we drop the merge tables first!
drop table if exists t4,t3,t1,t2;

create table t1 (c char(10)) type=myisam;
create table t2 (c char(10)) type=myisam;
create table t3 (c char(10)) union=(t1,t2) type=merge;
insert into t1 (c) values ('test1');
insert into t1 (c) values ('test1');
insert into t1 (c) values ('test1');
insert into t2 (c) values ('test2');
insert into t2 (c) values ('test2');
insert into t2 (c) values ('test2');
select * from t3;
select * from t3;
delete from t3 where 1=1;
select * from t3;
select * from t1;
drop table t3,t2,t1;

#
# Test 2
#

CREATE TABLE t1 (incr int not null, othr int not null, primary key(incr));
CREATE TABLE t2 (incr int not null, othr int not null, primary key(incr));
CREATE TABLE t3 (incr int not null, othr int not null, primary key(incr))
TYPE=MERGE UNION=(t1,t2);

SELECT * from t3;

INSERT INTO t1 VALUES ( 1,10),( 3,53),( 5,21),( 7,12),( 9,17);
INSERT INTO t2 VALUES ( 2,24),( 4,33),( 6,41),( 8,26),( 0,32);
INSERT INTO t1 VALUES (11,20),(13,43),(15,11),(17,22),(19,37);
INSERT INTO t2 VALUES (12,25),(14,31),(16,42),(18,27),(10,30);

SELECT * from t3 where incr in (1,2,3,4) order by othr;
alter table t3 UNION=(t1);
select count(*) from t3;
alter table t3 UNION=(t1,t2);
select count(*) from t3;
alter table t3 TYPE=MYISAM;
select count(*) from t3;

# Test that ALTER TABLE rembers the old UNION

drop table t3;
CREATE TABLE t3 (incr int not null, othr int not null, primary key(incr))
TYPE=MERGE UNION=(t1,t2);
show create table t3;
alter table t3 drop primary key;
show create table t3;

drop table t3,t2,t1;

#
# Test table without unions
#
create table t1 (a int not null) type=merge;
select * from t1;
drop table t1;

#
# Bug found by Monty.
#

drop table if exists t3, t2, t1;
create table t1 (a int not null, b int not null, key(a,b));
create table t2 (a int not null, b int not null, key(a,b));
create table t3 (a int not null, b int not null, key(a,b)) TYPE=MERGE UNION=(t1,t2);
insert into t1 values (1,2),(2,1),(0,0),(4,4),(5,5),(6,6);
insert into t2 values (1,1),(2,2),(0,0),(4,4),(5,5),(6,6);
flush tables;
select * from t3 where a=1 order by b limit 2;
drop table t1,t2,t3;