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From: Richard Huxton <dev@archonet.com>
To: Jan Wieck <JanWieck@Yahoo.com>
Cc: Svenne Krap <svenne@krap.dk>
Cc: Postgresql Performance <pgsql-performance@postgresql.org>
Subject: Re: Perfomance of views
Date: Thu, 27 Oct 2005 16:40:39 +0100
Message-ID: <4360F4F7.8070503@archonet.com> (raw)
In-Reply-To: <4360D906.3060504@Yahoo.com>
References: <435FA002.4060509@krap.dk>
	<43609EF4.8060907@archonet.com>
	<4360AE59.6010209@krap.dk>
	<4360BA22.5050606@archonet.com>
	<4360D906.3060504@Yahoo.com>

Jan Wieck wrote:
> On 10/27/2005 7:29 AM, Richard Huxton wrote:
>> Svenne Krap wrote:
>>
>>> What do you mean exactly but "pushing conditions inside" ?
>>
>> If I have something like "SELECT * FROM complicated_view WHERE foo = 
>> 7" then the planner can look "inside" complicated_view and see where 
>> it can attach the condition "foo=7", rather than running the query and 
>> applying the condition at the end.
> 
> Sorry, but the planner doesn't attach the condition anywhere. It is the 
> rewriter that takes the actual query, replaces the views rangetable and 
> expression entries with the actual underlying objects and adds the views 
> condition with an AND to the queries condition. Simply example:

Thanks for the correction Jan.

-- 
   Richard Huxton
   Archonet Ltd



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