Re: pgsql: Have numeric 0 ^ 4.3 return 1, rather than an error, and have 0 ^

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-committers(at)postgresql(dot)org
Subject: Re: pgsql: Have numeric 0 ^ 4.3 return 1, rather than an error, and have 0 ^
Date: 2008-05-08 22:34:20
Message-ID: 200805082234.m48MYK328302@momjian.us
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Tom Lane wrote:
> momjian(at)postgresql(dot)org (Bruce Momjian) writes:
> > Have numeric 0 ^ 4.3 return 1, rather than an error, and have 0 ^ 0.0
> > return 1, rather than error.
>
> This is wrongly described, and the implementation is still not correct
> either, because it should throw an error for negative exponents.
> Would you please *read* that wikipedia page you keep citing?
> http://en.wikipedia.org/wiki/Exponentiation#Powers_of_zero

I think this is fixed in the version I just committed:

test=> select 0 ^ (-1);
ERROR: invalid argument for power function
test=> select 0 ^ (-1.0);
ERROR: invalid argument for power function

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Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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