| From: | "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "alexandre :: aldeia digital" <alepaes(at)aldeiadigital(dot)com(dot)br>, <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: 30-70 seconds query... |
| Date: | 2003-03-31 23:44:32 |
| Message-ID: | Pine.LNX.4.33.0303311644100.13078-100000@css120.ihs.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Mon, 31 Mar 2003, Tom Lane wrote:
> I said:
> > PG 7.4 will be better prepared to handle this sort of query, but I don't
> > think it will realize that the T1/T2 left join could be reduced to a
> > plain join given these conditions
>
> I take that back --- actually, the algorithm used in CVS tip *does*
> deduce that all these left joins can be plain joins.
>
> Don't suppose you'd like to experiment with a current snapshot to see
> how well it does for you?
Think we can get the authors of the case tool that started this to include
it? :-)
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