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

[leijurv]

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

I have downloaded California, New York, New Jersey, Texas, Poland, Netherlands, Sweden, some of Japan, and some of England. It's larger than what fits into my ram.

I think it's reasonable to compare "how long does it take to get all lines && the updated tile" with "how long is the rest of the incremental update"?

I will look into trying to measure performance "cold" with nothing cached in memory.

If performance is a problem, I know for sure I could make it much faster if the generalization could receive the exact ways that were edited, like carto's flex lua code, rather than Z/X/Y tiles. That way the slow part (the &&tile_box) can be skipped entirely. 

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