Hive Full Table Scan vs. Predicate Pushdown on Outer Join

hive-predicate-pushdown.sql

--#### Assume sales Hive table partitioned by day_id ####--

--Full Table Scan
select
employees.id,
b.sales
from employees
left join sales on (employees.id = sales.employee_id)
where day_id between '2014-03-01' and '2014-05-31';

--Partitioned-based query
select
employees.id,
b.sales
from employees
left join sales on (employees.id = sales.employee_id and sales.day_id between '2014-03-01' and '2014-05-31');

It works for left joins but doesn't seem to work with full outer join.