Re: Calculation of unused columns

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Calculation of unused columns
Date: 2009-10-19 16:01:17
Message-ID: 6391.1255968077@sss.pgh.pa.us
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I wrote:
> Just for fun, I hacked together a first cut at this.

Oh, just for the archives: I forgot about not suppressing volatile
expressions --- checking that would increase the cost of this
significantly, though it's only another line or two.

regards, tom lane

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