Commits on Jul 17, 2023

1. Append mode: Do not try to delete objects that can't exist in middle …

   When osm2pgsql runs in append mode it deletes all objects for which it
   gets new versions from the middle tables before then adding the new
   version. For a typical diff many of these deletes will be unnecessary
   because the objects are new. With this commit the behaviour changes
   slightly: We first get the maximum id from the nodes/ways/relations
   middle tables. This operation is fast, because the PostgreSQL max()
   function is aware of the btree index on those tables. Later, before we
   delete an object we check the id against that maximum id, if it is
   larger the object can't be in the table and we don't do the delete.
   
   (Note that in theory we could use the fact that an object has version
   number 1 to figure out that it must be new. But this is much less robust
   than what we are doing here, for instance when the diff overlaps with
   the original import.)

   

   joto committed Jul 17, 2023
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