[Tile-serving] [openstreetmap/osm2pgsql] OSM relations and hstore (#605)

[Alexander Matheisen]

Thanks for this explaination!

I do not know the exact situation of @settigan, but I want to explain my problem in detail if this might help you or if you know any quick workaround for my problem:

I am using osm2pgsql to import a planet file into a database. I want to import only objects with `railway=*`, also I want to store every tag including `railway=*` in hstore without any own tag column. For importing I am using this command:

`osm2pgsql --create --slim --hstore-all --hstore-match-only --hstore-add-index --style openrailwaymap.style --flat-nodes flatnodes --input-reader pbf planet-latest.osm.pbf` (removed some args such as database connection, which are not relevant here)

My style file looks like this:
```
# OsmType  Tag          DataType     Flags
node,way   z_order      int4         linear # This is calculated during import
way        way_area     real         linear # This is calculated during import
node,way   railway      text         polygon,nocolumn
```

As I described above, I removed the `area` line to avoid that any objects are imported just because of their `area=*`. Now only nodes and ways with `railway=*` are imported, except for relations.

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