| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Gregory Stark <stark(at)enterprisedb(dot)com> |
| 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 11:53:50 |
| Message-ID: | 1220356430.4371.382.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-patches |
On Tue, 2008-09-02 at 12:05 +0100, Gregory Stark wrote:
> I wonder if it would be more worthwhile to remove them and have a
> subsequent phase where we look for possible joins to *add*. So even if
> the user writes
> "select * from invoices where customer_id=?" the planner might be able
> to discover that it can find those records quicker by scanning
> customer, finding the matching <company_id,customer_id> and then using
> an index to look them up in invoices.
That's a good idea.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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