Thank you for your detailed response. I now finally have the time to look at
this again, and what you have written has been very helpful so far.
It seems like I will be able to find a way to achieve this by keeping things
the way they are for multipolygon relations, but resolving the geometries of
route relations in the second stage only, although this will be a bit of work
to implement.
I am not deep enough in the internals of how osm2pgsql actually works to make a
qualified suggestion how it could be improved to support my use case. From my
novice point of view it seems like the `object:as_multilinestring()` relation
method would be the usual approach to achieve what I am trying to do, and it
does seem convenient. The specific functionality that I’m missing for my use
case is to exclude relation members based on their _tags_. It seems to me like
this is something that could be added somehow, since I supposed the method
needs to load the individual member objects anyways to resolve their
geometries, so it wouldn’t cause an additional performance regression?
Interestingly, even if I ignore a way in the `osm2pgsql.process_way(object)`
function both in the first and second stage, its geometry is still added to the
relation. However, I suspect that I might be able to exclude members of the
relation based on their _role_ by simply deleting them from the `members`
property before calling `object:as_multilinestring()`. I will have to try this
out, and if it works this could be a feasible solution that wouldn’t even
require two-stage processing, as railway platforms can be identified both by
their member role as well as by their object tags.
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