Hmmm. My brain is being jostled and I'm confusing illustra-postgres,
informix-postgres and postgresql. Some things had functions and
some things had constants and I do not remember which products had
what combination. But probably how they are in postgresql, post
hellerstein, is how I am remembering.
I can find out for sure, given a little time, by querying old contacts.
It would be best if I had a clear question to ask, though.
--elein
On Thu, Apr 14, 2005 at 02:58:09PM -0400, Alvaro Herrera wrote:
> On Thu, Apr 14, 2005 at 10:39:03AM -0700, elein wrote:
>
> > All functions could have a cost associated with them, set by the writer of
> > the function in order for the planner to reorder function calls.
> > The stonebraker airplane level example was:
> > select ... from ... where f(id) = 3 and expensive_image_function(img)
> > The idea, of course is to weight the expensive function so it was
> > pushed to the end of the execution.
>
> So there was only a constant cost associated with the function? No
> estimator function, for example?
>
> --
> Alvaro Herrera (<alvherre[@]dcc.uchile.cl>)
> "If you have nothing to say, maybe you need just the right tool to help you
> not say it." (New York Times, about Microsoft PowerPoint)
>