On Thu, Apr 10, 2014 at 11:09 AM, Alexander Korotkov <aekorotkov@gmail.com> wrote:
Hi,
GIN partial match appears to be broken after fast scan. Following simple test case raises assertion failure.
create extension btree_gin;
create table test as (select id, random() as val from generate_series(1,1000000) id);
create index test_idx on test using gin (val);
vacuum test;
select * from test where val between 0.1 and 0.9;
Attached patch fixes bugs in entryGetItem function.
I would especially point that "continue;" checks "while" condition even if it's postfix "while". That's why I surrounded tbm_iterate with another "while".
Interesting... to me (using current master) your test case doesn't fail...
fabrizio=# select * from test where val between 0.1 and 0.9; id | val --------+------------------- 1 | 0.554413774050772 2 | 0.767866868525743 3 | 0.601187175605446 ...
But fail if I change the values of between clause:
fabrizio=# select * from test where val between 0.1 and 0.19; ERROR: tuple offset out of range: 8080
Regards,
--
Fabrízio de Royes Mello Consultoria/Coaching PostgreSQL