[Tile-serving] [openstreetmap/osm2pgsql] pgsql-mid fails on relations with more than 32767 members (#713)

[Sarah Hoffmann]

pgsql-mid stores the member offset for relations in the planet_osm_rels table as smallints (way_off, rell_off columns). That means that the number of members it can safely handle is restricted to 32767. However, the limit is nowhere checked. Trying to import a larger relation leads to the error:

     Osm2pgsql failed due to ERROR: insert_rel failed: ERROR:  value "37945" is out of range for type smallint

This happened recently with relation 7066589.

osm2pgsql should drop relations that are too large early in the processing. What would a reasonable upper limit be?

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