[Tile-serving] [openstreetmap/osm2pgsql] How can you get country boundaries with flex output? (Discussion #1934)

[Sarah Hoffmann]

Boundaries are mapped as relations in OSM (and only relations), so you need to use the `process_relation()` function. Also have a look at the `not_null` flag for geometry columns. 

And finally, for country boundaries better filter by `boundary=administrative`. People have funny ideas, where they add an `admin_level`tag. Give the `--remove-tags` switch a try. It is another great way to reduce the amount of noise from referenced objects (e.g. ways in your boundary relation which you only want for the geometry).

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