[Tile-serving] [osm2pgsql-dev/osm2pgsql] How can I figure out exactly what ways (roads, tracks) have changed based on an OSC OsmChange file? (Discussion #2144)

[Paul Norman]

The transform functions are called for each object that was changed as a result of the OSC file, not just the objects that are changed in the OSC file.

One issue you might have is objects that are processed are **potentially** changed and may have stayed the same. It also calls the functions on the new/modified object, not on the change itself. Deletes never hit the transforms, and a modify is a delete/create so it looks exactly like a create.

You could also consider triggers on your feature tables but you'll have similar issues with modifies being create/delete

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