[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add grouped-linemerge generalization (PR #2482)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2482)

So far so good. I imported the planet and ran a few updates. The first osm2pgsql-gen run took about 20 minutes after a 4 hour import. The first osm2pgsql-gen update about 5 minutes to catch up the 5 hours or so of changes with nearly 500,000 tiles affected. After that the osm2pgsql-gen for minutely updates runs through in basically no time.

Looking at a few examples it seems it is doing the right thing. I'leave this running for a while to see whether there are any problems, but it looks very promising.

Question now: From my look at the code I don't see anything that couldn't be done in Lua/SQL alone. Do we actually need the C++ part or can we just use `run_sql()`?

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