Re: 8.4, One-Time Filter and subquery ( ... FROM function() union all ... )

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

> Sergey Burladyan <eshkinkot(at)gmail(dot)com> writes:
> > Oh, now problem with simple query:
>
> > 8.4.0 from Debian
> > explain analyze select i from t where i >= 10 and i = 1;
> > QUERY PLAN
> > ------------------------------------------------------------------------------------
> > Result (cost=0.00..0.01 rows=1 width=0) (actual time=0.002..0.002 rows=0 loops=1)
> > One-Time Filter: false
> > Total runtime: 0.030 ms
>
> > CVS HEAD
> > explain analyze select i from t where i >= 10 and i = 1;
> > QUERY PLAN
> > ---------------------------------------------------------------------------------------------------
> > Seq Scan on t (cost=0.00..17030.00 rows=1 width=4) (actual time=449.651..449.651 rows=0 loops=1)
> > Filter: ((i >= 10) AND (i = 1))
> > Total runtime: 449.726 ms

> Hmm, that's got nothing to do with my recent patch, because there's no
> appendrel anywhere. Are you sure you are using the same
> constraint_exclusion setting in both cases?

Oops, of course you are right, i have constraint_exclusion = on in Debian, but
constraint_exclusion = partition by default in CVS HEAD %)

Thanks for help, Tom !

--
Sergey Burladyan