[Tile-serving] [openstreetmap/osm2pgsql] Duplicate rows with --expire-tiles option (#766)

[ardean80]

I'm trying to find out which tiles are expired each time I apply osm day diff to my planet db.
I niticed that, when I use osm2pgsql with the _--expire-tiles_ option, the count of rows on my 4 planet tables is greater than the count of rows on the same tables obtained without using the _--expire-tiles_ option: It seems like it duplicates modified rows, leaving the old ones in the db.
Here is the command I run:

`osm2pgsql -d planetdb -s -C 4096 --number-processes 8 --hstore-all --expire-tiles 19 --expire-output /tmp/expired_tiles_list`

In addition to applying the changes, I would expect such an option only to return a output file, with respect to the "normal" execution. Instead, executing osm2pgsql in two different ways (with/without the --expire-tiles option), it leaves the db in two different states.
How could this be possible? Am I doing something wrong?

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https://github.com/openstreetmap/osm2pgsql/issues/766
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