There is an incoming change to osm2pgsql which changes the format of
slim tables. This will change the schema of the slim tables, but have no
impact on the rendering tables.
The change is to use unprojected coordinates in slim tables, and an
osmium dense file array instead of flat nodes. There is no migration for
old databases.
It only impacts you if you
- Run an osm2pgsql database that updates with diffs; or
- Develop software which relies on the internals of the slim nodes table
or the flat nodes file (don't do this)
Nothing will change if you
- Only ever load data with --slim --drop or without --slim;
- Only ever update by reloading the database; or
- Only write software/styles which access the normal rendering tables
The pull request with details is
https://github.com/openstreetmap/osm2pgsql/pull/668
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