From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | David Fetter <david(at)fetter(dot)org> |
Cc: | Achim Domma <domma(at)procoders(dot)net>, Florian Pflug <fgp(at)phlo(dot)org>, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Access to current database from C-language function |
Date: | 2011-08-01 15:18:36 |
Message-ID: | CA+TgmoYvo7WGRi0BsttpmoVAJM=NO12+TK1nhm_TTQZv9Cn1+g@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Mon, Aug 1, 2011 at 11:04 AM, David Fetter <david(at)fetter(dot)org> wrote:
> SQL is Turing-complete, so the chances are excellent that it's
> possible to express that algorithm in it. ;)
>
> Look into common table expressions for iteration/recursion, and
> windowing functions, commonly used for time series.
>
> http://www.postgresql.org/docs/current/static/queries-with.html
> http://www.postgresql.org/docs/current/static/tutorial-window.html
That doesn't guarantee that it can be expressed efficiently, though.
I think the OP may be going overboard by trying to bypass SPI, but
putting the logic inside the server seems like it could well be
worthwhile.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
From | Date | Subject | |
---|---|---|---|
Next Message | Jeff Davis | 2011-08-01 15:21:19 | Re: lazy vxid locks, v3 |
Previous Message | David Fetter | 2011-08-01 15:04:58 | Re: Access to current database from C-language function |