[Tile-serving] [osm2pgsql-dev/osm2pgsql] Improving efficiency of the node location store (Issue #2403)

[Sarah Hoffmann]

lonvia created an issue (osm2pgsql-dev/osm2pgsql#2403)

The node location store currently has a very simple array structure which makes it easy to use and and very fast to access. The downside is that it needs nearly 100GB storage, no matter if you are importing a planet or just a small extract. We need a data structure that better compresses the data and works well for full planets and extracts alike.

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