On Sun, 15 Oct 2006, Tom Lane wrote:
> Jeremy Drake <pgsql@jdrake.com> writes:
> > CREATE TABLE test_domain (
> > fkey integer not null,
> > k integer not null,
> > x1 integer not null,
> > x2 integer,
> > mp m_or_p not null
> > );
>
> > CREATE INDEX test_domain_k_x1_x2_m ON test_domain (k, x1, x2) WHERE mp = 'm';
> > CREATE INDEX test_domain_k_x1_x2_p ON test_domain (k, x1, x2) WHERE mp = 'p';
>
> Perhaps you need a non-partial index.
I just tried that,
CREATE INDEX test_domain_k_x1_x2_mp ON test_domain (k, x1, x2, mp);
and dropped the others. That actually works properly.
jeremyd=# explain analyze select * from test_domain where k = 1255 and mp;
QUERY PLAN
----------------------------------------------------------------------------------------------------------------------------------Bitmap
HeapScan on test_domain (cost=5.37..237.21 rows=66 width=17) (actual time=0.115..0.707 rows=132 loops=1) Recheck
Cond:(k = 1255) Filter: mp -> Bitmap Index Scan on test_domain_k_x1_x2_mp (cost=0.00..5.37 rows=66 width=0) (actual
time=0.081..0.081rows=132 loops=1) Index Cond: ((k = 1255) AND (mp = true))Total runtime: 1.137 ms
(6 rows)
I thought I had to refer to all of the columns in order for this to work,
that I could not skip some in the middle, but it seems to work.
--
If you can survive death, you can probably survive anything.
