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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 17:36:15
Message-ID: 1255973775.492.10.camel@ebony (view raw or flat)
Thread:
Lists: pgsql-performance
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).

That would allow us to optimize such calls away, if appropriate.

-- 
 Simon Riggs           www.2ndQuadrant.com


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