I've made some progress with this - compiling the master version include the id
caching. Combining `turning-circles.lua` into the complex Carto configuration
has been a bit tricky, and my [version to
date](https://gist.github.com/dch0ph/59c7f7ad8cbc3f34766b3fb463e40817) is only
partially working.
Issues noted:
1. I've been keeping the "linking tables" quite minimal. The equivalent of the
`turning-circles` table in the example, `special_nodes_on_highways` has no data
columns. But I wasn't allowed to set
`table_columns['special_nodes_on_highways']` to an empty set of columns, `{}`,
hence the `dummy` column. Otherwise this table functions as expected.
2. The "way" based table `highways_with_special_nodes` has proved tricky. I
wasn't sure how to handle the segmenting of very long ways, since this could
produce a multilinestring. I've currently put the "checking for special nodes"
before the segmenting. I'm also missing the `transform(3857)` so this isn't
going to work anyway, but you can see my dilemma.
3. The insert into `highways_with_special_nodes` is quietly failing (the
inserts instructions are reached, but no rows appear in the table). Mismatched
geometries?
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