From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Karen Hill <karen_hill22(at)yahoo(dot)com>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: US Telephone Number Type |
Date: | 2006-07-11 05:27:49 |
Message-ID: | 20060711052749.GA32706@surnet.cl |
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Lists: | pgsql-general |
Tom Lane wrote:
> "Karen Hill" <karen_hill22(at)yahoo(dot)com> writes:
> > I did a quick google and someone mentioned that input and output
> > functions need to be written in C. Is that still the case?
>
> Yeah, pretty much. The main problem is that such functions need to deal
> with whatever physical on-disk format you've chosen for the datatype,
> and most of our PLs don't offer bit-level memory access.
Is bit-level memory access the actual problem? I would think that at
least PL/Perl can offer that pretty easily using pack() or something
like that. Not that I've actually tried using it.
But I think the main problem may be getting our calling conventions
right. I mean, how would you do a PG_GETARG_BOOL() or stuff like that?
Maybe if we offered PG_GETARG_DATUM and PG_RETURN_DATUM equivalents in
PL/Perl we could offer I/O functions there.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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