mariadb/mysql-test/t/subselect_nulls.test

# Initialize tables for the test

--disable_warnings
drop table if exists x1;
drop table if exists x2;
--enable_warnings

set @tmp_subselect_nulls=@@optimizer_switch;
set optimizer_switch='semijoin=off';

create table x1(k int primary key, d1 int, d2 int);
create table x2(k int primary key, d1 int, d2 int);

insert into x1 values
    (10,   10,   10),
    (20,   20,   20),
    (21,   20,   null),
    (30,   null, 30),
    (40,   40,   40);
insert into x2 values
    (10,   10,   10),
    (20,   20,   20),
    (21,   20,   null),
    (30,   null, 30);

# Test various IN and EXISTS queries with NULL values and UNKNOWN
# Q1 T=(10, 20) U=(21,30) F=(40)
select *
from x1
where (d1, d2) in (select d1, d2
                   from x2);
select *
from x1
where (d1, d2) in (select d1, d2
                   from x2) is true;
select *
from x1
where (d1, d2) in (select d1, d2
                   from x2) is false;
select *
from x1
where (d1, d2) in (select d1, d2
                   from x2) is unknown;

# Q2 T=(10, 20) U=(30) F=(21, 40)
select *
from x1
where d1 in (select d1
             from x2
             where x1.d2=x2.d2);
select *
from x1
where d1 in (select d1
             from x2
             where x1.d2=x2.d2) is true;
select *
from x1
where d1 in (select d1
             from x2
             where x1.d2=x2.d2) is false;
select *
from x1
where d1 in (select d1
             from x2
             where x1.d2=x2.d2) is unknown;

# Q3 T=(10, 20) U=() F=(21, 30, 40)
select *
from x1
where 1 in (select 1
            from x2
            where x1.d1=x2.d1 and x1.d2=x2.d2);
select *
from x1
where 1 in (select 1
            from x2
            where x1.d1=x2.d1 and x1.d2=x2.d2) is true;
select *
from x1
where 1 in (select 1
            from x2
            where x1.d1=x2.d1 and x1.d2=x2.d2) is false;
select *
from x1
where 1 in (select 1
            from x2
            where x1.d1=x2.d1 and x1.d2=x2.d2) is unknown;

# Q4 T=(10, 20) F=(21, 30, 40)
select *
from x1
where exists (select *
              from x2
              where x1.d1=x2.d1 and x1.d2=x2.d2);

set optimizer_switch= @tmp_subselect_nulls;

drop table x1;
drop table x2;

#
# MDEV-7339 Server crashes in Item_func_trig_cond::val_int
#
select (select 1, 2) in (select 3, 4);
select (select NULL, NULL) in (select 3, 4);