joto left a comment (osm2pgsql-dev/osm2pgsql#2482)
I have run some tests adapting your code for merging boundaries. This was still
based on the version with the C++ code but I had to work around a limitation in
that. Having this completly in Lua code is opening up some more possibilities.
My tests are based on [this
code](https://github.com/osm2pgsql-dev/osm2pgsql-themepark/blob/master/themes/shortbread_v1_gen/topics/boundaries.lua)
which re-computes all merged boundaries for the whole planet whenever there is
a change. I have successfully used your code to do the same thing
incrementally! There are other use cases, not just streets or boundaries. I am
also thinking about waterways, railway lines, etc.
The question now is how to make this best re-usable, in a simple but flexible
way. With the boundaries I need to get the minimal admin_level from all
relations using a way. Currently I am updating this after the merging, but it
would be better if we can do this on the fly. Needs some more thinking and
exerimenting.
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