[Tile-serving] [openstreetmap/osm2pgsql] Import of changes failing because of TopologyException (#787)

[Christoph Hormann]

> How'd you check this, and what versions of components?

Extracted the relation from overpass api, converted to spatialite file with osmium (built from master from a few weeks back i think), converted to EPSG:3857 using ogr2ogr (GDAL 2.2.1) and checked for ST_IsValid() using spatialite.

I don't think this is an issue though - the geometry contains nothing that is prone to making it invalid upon reprojection and osmium would report and reject if it was invalid originally.

> All geometries being ST_IsValid is an essential constraint.

As @lonvia said then you need to check with Postgis and reject all geometries that violate this.  Geometries becoming invalid by reprojection is rare with mercator but with a whole planet that is still likely to occur a few times.

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