[Tile-serving] [openstreetmap/osm2pgsql] Add geometry functions in Lua / new insert syntax (PR #1736)

[Sarah Hoffmann]

@lonvia commented on this pull request.

Should you update the PR maybe remove the 'work in progress' from the commit message.

> + */
+int geom_gc() noexcept;
+
+// The following functions are called when their counterparts in Lua are
+// called on geometry objects.
+int geom_area();
+int geom_centroid();
+int geom_geometry_n();
+int geom_geometry_type();
+int geom_is_null();
+int geom_num_geometries();
+int geom_segmentize();
+int geom_simplify();
+int geom_srid();
+int geom_tostring();
+int geom_transform();

Do these need to be public?

> +
+                local g = object:as_polygon()
+                tables.polygons:insert({
+                    name = object.tags.name,
+                    geom = g,
+                    center = g:centroid(),
+                    type = g:geometry_type()
+                })
+            end
+
+            function osm2pgsql.process_relation(object)
+                local g = object:as_multipolygon()
+                tables.polygons:insert({
+                    name = object.tags.name,
+                    geom = g,
+                    type = g:geometry_type()

type is unused. Intentional?

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