| From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Andres Freund <andres(at)anarazel(dot)de>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Error-safe user functions |
| Date: | 2022-12-10 12:20:13 |
| Message-ID: | 20221210122013.swbpo63go6ty2fcn@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2022-Dec-09, Tom Lane wrote:
> I think though that it might be okay to just define this as
> Not Our Problem. Although we don't seem to try to enforce it,
> non-immutable domain check constraints are strongly deprecated
> (the CREATE DOMAIN man page says that we assume immutability).
> And not throwing errors is something that we usually consider
> should ride along with immutability. So I think it might be
> okay to say "if you want soft error treatment for a domain,
> make sure its check constraints don't throw errors".
I think that's fine. If the user does, say "CHECK (value > 0)" and that
results in a soft error, that seems to me enough support for now. If
they want to do something more elaborate, they can write C functions.
Maybe eventually we'll want to offer some other mechanism that doesn't
require C, but let's figure out what the requirements are. I don't
think we know that, at this point.
--
Álvaro Herrera Breisgau, Deutschland — https://www.EnterpriseDB.com/
"Estoy de acuerdo contigo en que la verdad absoluta no existe...
El problema es que la mentira sí existe y tu estás mintiendo" (G. Lama)
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