[Tile-serving] [osm2pgsql-dev/osm2pgsql] New nodes and ways can't have existing parents (PR #2183)

[Jochen Topf]

New nodes or ways (ie with version=1) can't have parent ways or relations. So we don't have to add them to the list of "changed nodes" or "changed ways" to trigger re-processing of changed parents. This will save us a whole lot of effort looking for parents that are never there.

Note that we are checking for version != 1. In the (unlikely) case that there are no versions in the input file (making version == 0), everything will work as before.
You can view, comment on, or merge this pull request online at:

  https://github.com/osm2pgsql-dev/osm2pgsql/pull/2183

-- Commit Summary --

  * New nodes and ways can't have existing parents

-- File Changes --

    M src/osmdata.cpp (18)
    M tests/bdd/flex/way-change.feature (22)

-- Patch Links --

https://github.com/osm2pgsql-dev/osm2pgsql/pull/2183.patch
https://github.com/osm2pgsql-dev/osm2pgsql/pull/2183.diff

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