[Tile-serving] [osm2pgsql] Similar tables do not function the same with multi-backend (#267)

[Sarah Hoffmann]

I'm thinking:

~~~
  struct tag {
    std::string key;
    std::string value;
};

std::vector<tag>
~~~

I'm not a fan of `std::pair`s because the first/second accessors make the code hard to read. Also, a simple struct is much more lightwight. It would probably also be a good idea to wrap the tag list in its own type and add a couple of convenience functions (e.g. get by key).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/267#issuecomment-88608592
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