[Tile-serving] [osm2pgsql-dev/osm2pgsql] Handling of Dependent Objects (Issue #2406)

[Paul Norman]

pnorman left a comment (osm2pgsql-dev/osm2pgsql#2406)

I'm not sure either - what I posted is a case of dependent objects, but this issue might only be about object invalidation

> Processing of dependent objects currently only works through OSM object dependencies: when a node changes, all ways and relations containing the node are reprocessed, same for ways. This can be at the same time, invalidate too many objects (changing the tags on a node might have no influence on the way) or too few (you might want to invalidate near-by nodes). The dependency handling also works the same for all tables: it is the input object that gets recomputed for all tables.
> 
> osm2pgsql needs a more flexible mechanism to handle dependent updates. Ideally the mechanism also allows to express transitive relationships: a change in OpenStreetMap triggers changes in table A, which in turn triggers updates in table B.



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