[Tile-serving] [openstreetmap/osm2pgsql] New "flex" backend (#1036)

[Paul Norman]

> I am pretty sure we are not going to give Lua access to the actual geometries and are not using any Lua libraries for this, because it would be quite a lot of overhead "shipping" geometries from C++ to Lua code and back etc. All this should be done in C++ code for performance, but this would, of course, put some limits on what can be done.

👍 

> * Reliance on Lua: osm2pgsql would long-term not work without Lua any more.
>   If this is seen as a problem, we could always keep the C++ transforms and
>   users of that just don't have all possibilities then.

I don't see this as an issue. With osm-carto and styles based on it using Lua, the C transforms are not essential as long as we have reasonable default options.

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I recall a mention of geometryless tables but can't find it again, had you discussed this?

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