Re: function(contants) evaluated for every row

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: function(contants) evaluated for every row
Date: 2010-11-24 20:19:14
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Bruce Momjian <bruce(at)momjian(dot)us> writes:
> I realize they can't be converted to constants before the query starts
> but is there a reason we can't convert those functions to constants in
> the executor before a table scan?

Other than the significant number of cycles that would be wasted (in
most cases) checking for the possibility, probably not. I'm dubious
that it would average out to a win though.

regards, tom lane

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