--disable_query_log
set @@session.explicit_defaults_for_timestamp=off;
--enable_query_log
# owner: peihan.dph
# owner group: SQL1
# description
#
--disable_warnings
drop table if exists t1,t2,t5,t6;
--enable_warnings
#
##
## bug http://bugfree.corp.taobao.com/bug/199785
## join with null values
##
CREATE TABLE t1 (
  pk int primary key,
  id int,
  gender varchar(1)
);
CREATE TABLE t2 (
  user_id int primary key,
  birthday datetime
);

insert into t1 values (1, NULL, 'M'), (2, 1, 'M'), (3, 2, 'F'),(4, 3, 'F'),(5, 4, 'F'),(6, 5, 'M');
insert into t2 values (1, '2002-06-09 00:00:00'),(2, '2002-06-09 00:00:00'),(100, '2002-06-09 00:00:00'),
(3, '2002-06-09 00:00:00'),(4, '2002-06-09 00:00:00');

select  id,gender,user_id from  t1,t2  where t2.user_id=t1.id;
####test for null safe equal with join....
create table t5(a int);
create table t6(a int);
insert into t5 values (null), (null);
insert into t6 values (null), (null);
select * from t5, t6 where t5.a <=> t6.a;
drop table t1,t2,t5,t6;