[Tile-serving] [osm2pgsql] route_name tag (#315)

[Paul Norman]

> Of course, getting access to properties of underlying ways when dealing with route relations (e.g. is this part of the relation off-road, on a bridge, etc) is still a dark art

The C transforms don't do this, but there is #230 open about adding the ability to do this in Lua.

> and I've no idea of the current output for route relations in osm2pgsql.
Assuming default.style, they get populated in the line table, but not the roads table. For a road relation, they are like `route=road ref=123`. If you added the columns, they'd also generally have a network value and a route_name value if the relation has a `name=*` tag. Unless there was a tagging error, they would not have a highway=* tag. If there *was* a tagging error and highway=* was on the relation, the road would end up being rendered twice, as with gravitystorm/openstreetmap-carto#302

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/315#issuecomment-118184974
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