[Tile-serving] [openstreetmap/osm2pgsql] Memory usage during phase 2 flex processing (Discussion #1536)

[mboeringa]

Although slightly speculative, I have the feeling that a large part of this issue with excessive memory usage, was down to the flex style issue described here:

https://github.com/gravitystorm/openstreetmap-carto/pull/4431/commits/b82ba637d977233991fc24e40ab84d7ba87644f9#r672314283

where in the OpenStreetMap route relation processing code, the route member objects would not only be added to the route table, but also to the line and roads table. This was fixed by Paul in another commit, and I have the feeling this also solved the excessive memory usage.

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