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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Matt Klinker <mklinker@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Query plan excluding index on view
Date: Sat, 05 Apr 2008 00:20:43 -0400
Message-ID: <28880.1207369243@sss.pgh.pa.us> (raw)
In-Reply-To: <3bda20f60804040726m15e1b9caqad3883cba960bab0@mail.gmail.com>
References: <3bda20f60804031631j177b42e2u82b5033fd23c2293@mail.gmail.com>
	<28177.1207266621@sss.pgh.pa.us>
	<3bda20f60804031654q7991de08m1254964511632acf@mail.gmail.com>
	<29828.1207271948@sss.pgh.pa.us>
	<3bda20f60804032158u4f6765e3t8b0debad3e7f5ceb@mail.gmail.com>
	<4767.1207288167@sss.pgh.pa.us>
	<3bda20f60804040726m15e1b9caqad3883cba960bab0@mail.gmail.com>

"Matt Klinker" <mklinker@gmail.com> writes:
> --Joined View:
> CREATE OR REPLACE VIEW directory_listing AS
>  SELECT school.id, school.name, school.description, 119075291 AS
> listing_type_fid
>    FROM school
> UNION ALL
>  SELECT company.id, company.name, company.description, 119074833 AS
> listing_type_fid
>    FROM company;

Ah, there's the problem :-(.  Can you get rid of the constants here?
The planner's currently not smart about UNION ALL subqueries unless
their SELECT lists contain just simple column references.

(Yes, fixing that is on the todo list, but don't hold your breath...
it'll be 8.4 material at the earliest.)

			regards, tom lane



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