[Tile-serving] [osm2pgsql] Change z_order of link roads (#132)

[Sarah Hoffmann]

I believe that the openstreetmap-carto style still relies on `tagtransform.c` at the moment. Changing the z-order there is slightly problematic because we don't know how many other styles depend on the current order.  So, I would suggest to move to the lua tagtransform at some point and have openstreetmap-carto supply its own style.lua. This way you can adapt the z-order exactly to the style as needed (and even introduce other tag preprocessing like normalization of booleans). However, you should be aware that lua support should still be considered beta. There might still be some smaller changes in the interface necessary and it might be a good idea to do some performance tests to compare with the c version of tagtransform. But that is nothing that should stop you from using it.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/132#issuecomment-43469198
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