[Tile-serving] [osm2pgsql-dev/osm2pgsql] Flex: Allow creating point geometry from way (PR #2429)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2429)

Force pushed new version: as_point() can now take an index argument when called for a way which specifies which member node to take the location from. Index is 1-based, negative indexes count from the back.

So :as_point(), :as_point(nil), :as_point(0), :as_point(1) will return the first node, :as_point(2) the second node and so on. :as_point(-1) will return the last node.

If the index is out of range a null geometry will be returned. If the parameter is not a number an error will be generated.

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