wrong query result with jit_above_cost= 0

From: Rushabh Lathia <rushabh(dot)lathia(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Andres Freund <andres(at)anarazel(dot)de>
Subject: wrong query result with jit_above_cost= 0
Date: 2018-06-26 18:20:32
Message-ID: CAGPqQf165-=+Drw3Voim7M5EjHT1zwPF9BQRjLFQzCzYnNZEiQ@mail.gmail.com
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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

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