[Talk-GB] Drinking Map of UK

[Andy Allan]

On 7 November 2011 16:58, Jonathan Bennett
<openstreetmap at jonno.cix.co.uk> wrote:

> Generally you shouldn't consider any performance implications when creating
> a tag, because you don't know what will change in the next version of the
> code.

Very true.

>The easy-for-mappers-but-maybe-a-bit-computationally-intensive scheme
> you're trying to avoid

Colon-delineated key namespaces are the exact opposite of
"easy-for-mappers", for all bar a very few ultra-geeky mappers. Who
happen to be the kind of people to invent new colon-delineated key
namespaces and find them easy to use, as it happens.

> For information, I'm assured that extra columns produce next to no
> performance degradation anyway since osm2pgsql started using hstore.

Which is not the case for the majority of osm2pgsql users that I'm
aware of - it's only certain people who use hstore in production. Not
that it should be influencing the rest of the discussion, just
pointing it out.

Cheers,
Andy