Tom Lane wrote:
> Is the value you are fetching from the geography table large enough to
> be toasted? I'm thinking you might be looking at the cost of repeated
> de-toastings.
Yeah, it's a fairly large geometry field so it will definitely be
getting toasted. So is it a case of with the mcatest function in place,
we're effectively caching the de-TOASTED value?
> BTW, that mcatest function is buggy --- it's not copying the last
> 4 bytes of the source value. I don't know enough about PostGIS
> data types to know what effect that would have.
It would probably lose that last point in the coordinate sequence, but
nothing major. I've removed the -VARHDRSZ part just to check and it
doesn't make any difference.
Many thanks,
Mark.
--
Mark Cave-Ayland
Sirius Corporation - The Open Source Experts
http://www.siriusit.co.uk
T: +44 870 608 0063
