[Tile-serving] [openstreetmap/osm2pgsql] How to select specific role members of relations and combine to create geometry (Discussion #1752)

[Jochen Topf]

In https://osm2pgsql.org/doc/manual.html#processing-callbacks you can see that there is a `members` array you can access from the parameter of the processing callback which contains all the members with their roles. The GeometryCollection we spoke about contains one geometry for each node and way member, so you can iterate over both the `object.members` array as well as the result of `object:as_geometrycollection()` at the same time, ignore the members of type relation and you have a one-to-one correspondence between roles and geometry. 

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