[Tile-serving] [openstreetmap/osm2pgsql] Set projection in flex output in column config (#1277)

[Jochen Topf]

@joto commented on this pull request.



>                  double const area =
-                    get_options()->reproject_area
-                        ? ewkb::parser_t(geom).get_area<reprojection>(
-                              get_options()->projection.get())
-                        : ewkb::parser_t(geom)
-                              .get_area<osmium::geom::IdentityProjection>();
+                    column.srid() == srid
+                        ? ewkb::parser_t(geom)
+                              .get_area<osmium::geom::IdentityProjection>()
+                        : ewkb::parser_t(geom).get_area<reprojection>(
+                              reprojection::create_projection(srid).get());

Yes, this is expensive. But this code is hopefully soon going to be revised anyway when we clean up the geometry generation with a cache holding already created geometries. I opted to leave this in for the time being. In most cases where this is used the projection for the `area` column will be the same as for the geometry column anyway, in which case the first option with the hard-coded `IdentityProjection` is used. So the expensive path here will only be taken if you use a non-mercator projection and use an area column.

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