| From: | Dimitri Fontaine <dfontaine(at)hi-media(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Greg Stark <gsstark(at)mit(dot)edu>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, Andres Freund <andres(at)anarazel(dot)de> |
| Subject: | Re: *_collapse_limit, geqo_threshold |
| Date: | 2009-07-07 20:08:08 |
| Message-ID: | 705D1702-857C-4DF7-A60E-4D50A283DF5C@hi-media.com |
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| Lists: | pgsql-hackers |
Le 7 juil. 09 à 21:45, Tom Lane a écrit :
> Dimitri Fontaine <dfontaine(at)hi-media(dot)com> writes:
>> Another idea would be to have more complex metrics for deciding when
>> to run geqo
>
> Pointless, since GEQO is only concerned with examining alternative
> join
> orderings. I see no reason whatever to think that number-of-relations
> isn't the correct variable to test to decide whether to use it.
Oh. It seems I prefer showing my ignorance rather than learning enough
first. Writing mails is so much easier...
Sorry for the noise,
--
dim
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