[postgis-devel] PostGIS function costs

[Paul Ramsey]

Since costs are only roughly used at the moment, I’d like to see them used in an order-or-magnitude sense… 10, 100, 1000, 10000

P.

> On May 6, 2016, at 11:10 AM, Sandro Santilli <strk at keybit.net> wrote:
> 
> On Thu, May 05, 2016 at 11:35:37PM -0700, Paul Norman wrote:
>> Short version: I have a way to get accurate PostGIS function costs and
>> will be doing a PR.
> 
> Good job, Paul.
> 
> My concern is that the same function (say ST_Buffer) may cost very
> few cycles or a lot of cycle depending on the input (a point vs. a
> line with hundreds or thousand of vertices). I guess this is a common
> problem with variable-size types.
> 
> I wonder if it would make sense to have the work you did packaged
> as an extention to run on the *real* data for a given database
> and tweak costs accordingly.
> 
> --strk;
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