Re: Precomputed constants?

["Jim C. Nasby" <jnasby(at)pervasive(dot)com>]

On Thu, Jun 15, 2006 at 06:31:02AM +0200, Zoltan Boszormenyi wrote:
> Jim C. Nasby ?rta:
> >On Wed, Jun 14, 2006 at 01:30:10PM +0200, B?sz?rm?nyi Zolt?n wrote:
> >  
> >>Replacing random() with a true constant gives me index scan
> >>even if it's hidden inside other function calls. E.g.:
> >>    
> >
> >The database has no choice but to compute random() for every row; it's
> >marked VOLATILE.
> >  
> 
> I see now, docs about CREATE FUNCTION mentions random(),
> currval() and timeofday() as examples for VOLATILE.
> But where in the documentation can I find this info about all
> built-in functions? Thanks.

No, but you can query pg_proc for that info. The docs should have info
about that table.
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software      http://pervasive.com    work: 512-231-6117
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