Aggregate Function on partitioned column return wrong result when there is an empty partition

hive2.0.1
create table testmax(id int) partitioned by (dt int);
insert into table testmax partition(dt=11) values(1);
alter table testmax add partition(dt=22);
select max(dt) from testmax;
The result is:
22
expected result is:
11

when use hive2.3.3 ,the result is right , but I can not find out which issue fixed this