Oracle CASE WHEN Bug

Question

Hi! During my work, i found an interesting bug like thing with the CASE WHEN condition.
The following query gives back 1 (as a correct result) for w.val if the "case when..." line is commented.
It gives null if the case when line is left in the query.
It is interesting, because the case when should not effect the w.val.
Is this a known problem? Is there a patch for this?
Thx
select
h.parent_id,
w.val
, case when 1 = 1 then 'OK' else 'NOK' end as PROBLEMATIC_LINE
from tmp_test h,
( select
c.parent_id,
min(nvl(ma.m, 1)) as val
from tmp_test c,
(select 0 as m, m.* from tmp_test m where parent_id = '000002') ma
where
ma.parent_id(+) = c.parent_id
group by c.parent_id
having min(nvl(ma.m, 1)) > 0
) w
where w.parent_id(+) = h.parent_id
To create the table tmp_test:
create table tmp_test
parent_id varchar2(6)
insert into tmp_test values ('000001')
insert into tmp_test values ('000001')
insert into tmp_test values ('000001')
I have just downloaded the a new version of oracle (OracleXE112)

Answer 1

Probably some logic mix up with your example?
Cheers
David