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

[leijurv]

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

Sure, I understand that tracking the old endpoints was grafted on arbitrarily and you're hesitant to do something so specific, rather than a general abstraction for telling the Lua code about deleted geometries.

So, I'm happy to revert to [this version](https://github.com/leijurv/osm2pgsql/blob/b0dd0994730a6b870ed7e5134b100dd808392ce6/src/gen/gen-grouped-linemerge.cpp), which only used regular tile expiry (and did not save line endpoints). Would that help?

Then I assume you would want me to set up a full planet db, and track osmchanges live, and report the performance? I'm willing to do that but I don't want to spend the time setting up a multi terabyte raid array (I have no single SSD that's large enough) if there is no chance of such a thing being merged.

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