On Thu, 2010-10-28 at 12:59 -0700, Ben wrote:
> On Oct 28, 2010, at 12:44 PM, Joshua D. Drake wrote:
> >
> > My tests show you are incorrect:
> >
> >
> > part_test=# explain analyze select * from foo join bar using (i) where
> > i=9;
> > QUERY
> > PLAN
> > ------------------------------------------------------------------------------------------------------------------
> > Nested Loop (cost=34.26..106.76 rows=200 width=20) (actual
> > time=0.004..0.004 rows=0 loops=1)
> > -> Append (cost=0.00..68.50 rows=20 width=12) (actual
> > time=0.004..0.004 rows=0 loops=1)
> > -> Seq Scan on foo (cost=0.00..34.25 rows=10 width=12)
> > (actual time=0.001..0.001 rows=0 loops=1)
> > Filter: (i = 9)
> > -> Seq Scan on foo_1 foo (cost=0.00..34.25 rows=10 width=12)
> > (actual time=0.000..0.000 rows=0 loops=1)
> > Filter: (i = 9)
> > -> Materialize (cost=34.26..34.36 rows=10 width=12) (never
> > executed)
> > -> Seq Scan on bar (cost=0.00..34.25 rows=10 width=12) (never
> > executed)
> > Filter: (i = 9)
> > Total runtime: 0.032 ms
> > (10 rows)
>
> strange. my tests don't agree with your tests :
Do you have constraint_exclusion turned on? You should verify with show
constraint_exclusion (I saw what you wrote below).
JD
P.S. Blatant plug, you coming to http://www.postgresqlconference.org ?
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