[Tile-serving] [openstreetmap/osm2pgsql] what is the official lua file for the suite osm2pgsql / renderd(cartocss) ? (#843)

[sav123]

On openstreetmap-carto there is openstreetmap-carto.lua and in the osm2pgsl distibution style.lua.
They do different things , particularly with z_order. 

Style.lua is near to tagtransform-c but openstreetmap-carto.lua is fresher.

If it is style.lua there is one or two possible small optimizations : a break ( or a direct return ) in the double loop of filter_tags_generic() and an order inversion of the 2 blocks of filter_basic_tags_rel(). Not very important, the time killer of the lua process being the strings stack push/pop.





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