| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, List pgsql-patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: WIP Join Removal |
| Date: | 2008-09-02 16:15:27 |
| Message-ID: | 1220372127.4371.456.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-patches |
On Tue, 2008-09-02 at 12:02 -0400, Tom Lane wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> >> Oh. How does the query look like after removing the join, then?
>
> > Same answer, just slower. Removing the join makes the access to a into a
> > SeqScan, whereas it was a two-table index plan when both tables present.
>
> I don't really believe this...
Yes, this will be changed. No need to review further at this stage.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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