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To: "Marc G. Fournier" <scrappy@postgresql.org>
Cc: pgsql-hackers@postgresql.org
Subject: Re: ALTER TABLE ( smallinto -> boolean ) ... 
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Comments: In-reply-to "Marc G. Fournier" <scrappy@postgresql.org>
	message dated "Thu, 01 Sep 2005 17:49:02 -0300"
Date: Thu, 01 Sep 2005 16:56:45 -0400
Message-ID: <6399.1125608205@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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"Marc G. Fournier" <scrappy@postgresql.org> writes:
> On Mon, 29 Aug 2005, Tom Lane wrote:
>> No, because there's no built-in cast from smallint to bool.

> 'k, I just took a read through the "CREATE CAST" man page, and don't think 
> I can use that for this,

Sure you can.  Make a SQL or PLPGSQL function that does the conversion
you want and then create a cast using it.

			regards, tom lane