From: Dean Gibson (DB Administrator) <postgresql@ultimeth.com>
To: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: FUNCTIONs and CASTs
Date: Fri, 15 Feb 2008 15:03:02 -0800
Message-ID: <47B61A26.4060806@ultimeth.com> (raw)
In-Reply-To: <655.1203114745@sss.pgh.pa.us>
References: <47B4C9E4.8090002@ultimeth.com>
<20670.1203031191@sss.pgh.pa.us>
<47B4EF3E.4090608@ultimeth.com>
<47B55DA1.1060706@archonet.com>
<47B5D790.4090509@ultimeth.com>
<655.1203114745@sss.pgh.pa.us>
On 2008-02-15 14:32, Tom Lane wrote:
> "Dean Gibson (DB Administrator)" <postgresql@ultimeth.com> writes:
>
>> Again, you are not understanding my point. My point was that specifying
>> tablename.columnname%TYPE notation doesn't help with the performance
>> problem; I have to explicitly cast the parameter in the body of the
>> function.
>>
>
> The reason for the lack of communication is that no one else believes
> that premise. Casting a value to the same type it already has is
> demonstrably a no-op.
>
Casing a TEXT item to a CHAR( 9 ) item isn't a no-op. I've seen this
before in "EXPLAIN ..." output, where a search on an indexed column will
be sequential because the planner treats the search value as TEXT rather
than CHAR( 9 ).
Are you saying that no one believes there is a performance difference?
Amazing ...
Tom, I've privately eMailed you access instructions to one of my DB
servers, so you can see for yourself.
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To: pgsql-sql@postgresql.org
Cc: postgresql@ultimeth.com
Subject: Re: FUNCTIONs and CASTs
In-Reply-To: <47B61A26.4060806@ultimeth.com>
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