wrong query result with jit_above_cost= 0

Hi,

I found the below query which returns the wrong output
when jit_above_cost= 0 is set.

Steps to reproduce:

CREATE TABLE emp (
epno NUMERIC(4),
ename VARCHAR(10),
job VARCHAR(9),
mgr NUMERIC(4),
hiredate DATE,
sal NUMERIC(7,2),
comm NUMERIC(7,2),
deptno NUMERIC(2)
);

INSERT INTO emp VALUES (7369,'SMITH','CLERK',7902,'17-DEC-80',800,NULL,20);
INSERT INTO emp VALUES
(7499,'ALLEN','SALESMAN',7698,'20-FEB-81',1600,300,30);

set jit_above_cost= 0;

select max(epno) from emp group by rollup((deptno,epno)) order by 1 asc;

without the ROLLUP, I don't see any problem with results.

Thanks,
Rushabh Lathia
www.EnterpriseDB.com