Make sure subqueries don't return more than one result.
Make sure subqueries don't return more than one result.

thomaskonrad/osm-austria-building-coverage,thomaskonrad/osm_austria_building_coverage,thomaskonrad/osm_austria_building_coverage,thomaskonrad/osm_austria_building_coverage,thomaskonrad/osm_austria_building_coverage,thomaskonrad/osm-austria-building-coverage,thomaskonrad/osm-austria-building-coverage,thomaskonrad/osm-austria-building-coverage