MV rewriting not being triggered for last query in materialized_view_rewrite_4.q

create materialized view mv1 enable rewrite as
select dependents.empid, emps.deptno, count(distinct salary) as s
from emps
join dependents on (emps.empid = dependents.empid)
group by dependents.empid, emps.deptno;

select emps.deptno, count(distinct salary) as s
from emps
join dependents on (emps.empid = dependents.empid)
group by dependents.empid, emps.deptno;