Date: Thu, 1 Sep 2005 17:49:02 -0300 (ADT)
From: "Marc G. Fournier" <scrappy@postgresql.org>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgresql.org
Subject: Re: ALTER TABLE ( smallinto -> boolean ) ... 
In-Reply-To: <15013.1125359379@sss.pgh.pa.us>
Message-ID: <20050901174341.N1044@ganymede.hub.org>
References: <20050829201253.X1044@ganymede.hub.org>
	<15013.1125359379@sss.pgh.pa.us>
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On Mon, 29 Aug 2005, Tom Lane wrote:

> "Marc G. Fournier" <scrappy@postgresql.org> writes:
>> # ALTER TABLE table ALTER COLUMN field1 type boolean;
>> ERROR:  column "field1" cannot be cast to type "pg_catalog.bool"
>
>> Should this not work?
>
> No, because there's no built-in cast from smallint to bool.  You could
> do something like
>
> ... type boolean using case when field1=0 then false else true end;

'k, I just took a read through the "CREATE CAST" man page, and don't think 
I can use that for this, but is there some way I can create a cast for 
this, so that we don't have to go through the complete application and 
change "VALUES ( 0 );" to "VALUES ( '0' );" ...

Again, from reading the man page, I'm guessing not, but just want to make 
sure that I haven't missed anything ...

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org           Yahoo!: yscrappy              ICQ: 7615664