| From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
|---|---|
| To: | Thomas Schoen <t(dot)schoen(at)vitrado(dot)de> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Does IMMUTABLE have any effect on functions? |
| Date: | 2005-03-03 13:56:55 |
| Message-ID: | 20050303135610.GC22442@svana.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Lookup the docs, but IMMUTABLE and other such tags are hints to the
optimiser. If a function is immutable then the optimiser can optimise
away any invocations. If your function isn't actually immutable you've
just caused a problem.
They don't affect the actual function at all...
On Thu, Mar 03, 2005 at 02:17:17PM +0100, Thomas Schoen wrote:
> Hi,
>
> i wonder if the attribute IMMUTABLE has any effect on functions.
> Maybe its not implemented yet?
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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