[Tile-serving] [osm2pgsql] Add support for site relations (#221)

[Paul Norman]

> while a geometrycollection doesn't have implications of
> this kind (could be scattered around the world)

generally a geometrycollection will be localized as otherwise the pre-computed bounding box used for various purposes will cover too much.



> Please also note that there are ~130000 site relations and only ~1400
> collections in our db (as of now).

I'm not sure what you're getting at here - how's this relevant?

> A site relation does offer more semantics via roles, you can say where the
> ticket office is to enter a site, or where the parking for a site is (even
> if not inside the site perimeter).

None of the geometry types will allow roles. Unless you're proposing schema changes, roles aren't relevant

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https://github.com/openstreetmap/osm2pgsql/issues/221#issuecomment-64694502
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