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From: Craig A. James <cjames@modgraph-usa.com>
To: pgsql-performance@postgresql.org
Subject: Re: Overriding the optimizer
Date: Thu, 15 Dec 2005 18:18:09 -0800
Message-ID: <43A223E1.5040903@modgraph-usa.com> (raw)
In-Reply-To: <43A21D74.8030002@familyhealth.com.au>
References: <200512141603.52583.blargity@gmail.com>
	<7484.1134600423@sss.pgh.pa.us>
	<1134629567.14248.27.camel@firebolt>
	<200512150148.16125.blargity@gmail.com>
	<1134644526.14248.60.camel@firebolt>
	<43A1C40D.8040006@paradise.net.nz>
	<43A1F6DB.3080805@modgraph-usa.com>
	<43A21D74.8030002@familyhealth.com.au>

Christopher Kings-Lynne wrote:
>>    select * from my_table     where row_num >= 50000 and row_num < 100000
>>     and myfunc(foo, bar);
> 
> 
> You just create an index on myfunc(foo, bar)

Thanks, but myfunc() takes parameters (shown here as "foo, bar"), one of which is not a column, it's external and changes with every query.  A function index won't work.

Craig

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