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Re: Calculation of unused columns

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Volker Grabsch <vog(at)notjusthosting(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Calculation of unused columns
Date: 2009-10-19 17:48:58
Message-ID: 1255974538.492.21.camel@ebony (view raw or flat)
Thread:
Lists: pgsql-performance
On Mon, 2009-10-19 at 13:43 -0400, Tom Lane wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> > On Sat, 2009-10-17 at 21:41 -0400, Tom Lane wrote:
> >> one thing we'd have to consider
> >> is whether it is okay to suppress calculation of columns containing
> >> volatile functions.
> 
> > I think we should have a 4th class of functions,
> > volatile-without-side-effects (better name needed, obviously).
> 
> What for?  There wouldn't be that many, I think.  random() and
> clock_timestamp(), yeah, but most volatile user-defined functions
> are either volatile-with-side-effects or misdeclared.

Read only vs. read write?

-- 
 Simon Riggs           www.2ndQuadrant.com


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