mariadb/mysql-test/t/count_distinct2.test

create table t1(n1 int, n2 int, s char(20), vs varchar(20), t text);
insert into t1 values (1,11, 'one','eleven', 'eleven'),
 (1,11, 'one','eleven', 'eleven'),
 (2,11, 'two','eleven', 'eleven'),
 (2,12, 'two','twevle', 'twelve'),
 (2,13, 'two','thirteen', 'foo'),
 (2,13, 'two','thirteen', 'foo'),
 (2,13, 'two','thirteen', 'bar'),
 (NULL,13, 'two','thirteen', 'bar'),
 (2,NULL, 'two','thirteen', 'bar'),
 (2,13, NULL,'thirteen', 'bar'),
 (2,13, 'two',NULL, 'bar'),
 (2,13, 'two','thirteen', NULL);

select distinct n1 from t1;
select count(distinct n1) from t1;

select distinct n2 from t1;
select count(distinct n2) from t1;

select distinct s from t1;
select count(distinct s) from t1;

select distinct vs from t1;
select count(distinct vs) from t1;

select distinct t from t1;
select count(distinct t) from t1;

select distinct n1,n2 from t1;
select count(distinct n1,n2) from t1;

select distinct n1,s from t1;
select count(distinct n1,s) from t1;

select distinct s,n1,vs from t1;
select count(distinct s,n1,vs) from t1;

select distinct s,t from t1;
select count(distinct s,t) from t1;

select count(distinct n1), count(distinct n2) from t1;

select count(distinct n2), n1 from t1 group by n1;
drop table t1;

# test the converstion from tree to MyISAM
create table t1 (n int default NULL);
let $1=5000;
disable_query_log;
while ($1)
{
 eval insert into t1 values($1);
 dec $1;
}
enable_query_log;

flush status;
select count(distinct n) from t1;
show status like 'Created_tmp_disk_tables';
drop table t1;

#test conversion from heap to MyISAM
create table t1 (s text);
let $1=5000;
disable_query_log;
while ($1)
{
 eval insert into t1 values('$1');
 dec $1;
}
enable_query_log;
flush status;
select count(distinct s) from t1;
show status like 'Created_tmp_disk_tables';
drop table t1;