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Re: Binary data type with other output method

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Andreas 'ads' Scherbaum <adsmail(at)wars-nicht(dot)de>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Binary data type with other output method
Date: 2007-12-26 01:36:23
Message-ID: 4771B017.60501@dunslane.net (view raw or flat)
Thread:
Lists: pgsql-hackers

Tom Lane wrote:
> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>   
>> I think all you need to do it this:
>> Take the code for boolout() in src/backend/utils/adt/bool.c, adjust it 
>> and and make it a new function boolout2. Use pgxs to make it a loadable 
>> module.
>> Then load it and adjust the catalog entry for the bool type to use 
>> boolout2 instead of boolout.
>>     
>
> Then start fixing pg_dump, psql, and every other bit of client-side code
> that expects the boolean columns in the system catalogs to read out as
> 't'/'f' ...
>   

hmm, good point. Oh, well.

> I think you'd really need a separate type.  But have you considered
> something simple like
> 	CREATE DOMAIN boolint AS int CHECK (value = 0 OR value = 1)
>
>   

Of course, that's not exactly what he asked for. Maybe we need to know 
more about the case.

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