Re: wrong query result with jit_above_cost= 0

Hi,

On 2018-06-26 23:50:32 +0530, Rushabh Lathia wrote:
> 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.

Interesting. I've opened an open item referencing this.

Greetings,

Andres Freund