On 05/11/2011 21:48, Graham Jones wrote:
I know that tagging for the renderer is frowned upon, but I really do not like all these colons in key names, because (as far as I know) that means having an extra column in the database produced by osm2pgsql for rendering....and every time I want to add an extra column it means an entire re-import of the databse.
I don't claim to be an osm2pgsql expert, but I think that's a misunderstanding of the situation. I think *any* new tag added to osm.xml results in an extra column, whether it has a colon or not.
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. The easy-for-mappers-but-maybe-a-bit-computationally-intensive scheme you're trying to avoid may become a non-issue with a few lines of code changed. Equally the opposite may happen.
For information, I'm assured that extra columns produce next to no performance degradation anyway since osm2pgsql started using hstore.
Jonathan. _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
