[postgis-devel] patch adding cachable to certain functions

[strk at refractions.net]

Committed --strk;

On Sat, Jan 01, 2005 at 05:42:26PM -0500, Carl Anderson wrote:
> 
> add cachable to certain functions .
> 
> cachable is appropriate whenever the output will be the same for the 
> same params.
> it also speeds up statements like
> 
> select boundary(the_geom) from mytab where length(boundary(the_geom)) > 10;
> 
> because cachable tells postgres that it does not need to compute 
> boundary() twice.
> 
> C.


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