[Tile-serving] [openstreetmap/osm2pgsql] Allow propagating tags to ways during relations processing (#230)

[Christoph Hormann]

> I see no problems that propagating relation tags back to ways through the transforms could not solve.

Whenever the relation actually represents a relationship between its members and is not just a collection of independent features (like in this case: all roads that belong to a certain route).

For the route and multipolygon relation this is solved through distinct handling and generating combined geometries but for all other relation types this would need to be separately implemented.

The most widespread relation type where this applies is turn restrictions.  If you'd want to represent turn restrictions propagating tags is not enough.  Generating separate geometries for them in addition could help to some extent - though you would still have the problem that the same road can be member of multiple turn restriction relations in different roles and i see no way to properly represent this in the database without creating references between geometries which would need to be interpreted via table joins.


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