| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Christophe Pettus <xof(at)thebuild(dot)com> |
| Cc: | pgsql-general list <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: 'alternatives' |
| Date: | 2012-11-28 22:32:38 |
| Message-ID: | 20121128223238.GC616@awork2.anarazel.de |
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| Thread: | |
| Lists: | pgsql-general |
Hi,
On 2012-11-28 14:16:18 -0800, Christophe Pettus wrote:
> Thanks!
Not much to thank for, the answer was actually wrong...
> Does that apply to views as well? (This particular plan was not from a prepared or PL/pgSQL statement, but did include views.)
Its not really relevant for views no.
The real answer for this is that this actually a 8.4 feature not the
aforementioned 9.2 feature.
The commit introducing this is:
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=bd3daddaf232d95b0c9ba6f99b0170a0147dd8af
What that does to add hashing support for IN(). But hashing can be
pessimal in comparison to a explicit check if only a few values come in,
so this can be checked at runtime after the above commit...
Greetings,
Andres Freund
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