I've got a PostGIS database created and maintained with osm2pgsql. For some of the Mapnik rendering I'm doing, I'd like to see whether ways belong to relations. (Specifically, whether a highway=* way is a member of a route=road relation.) I've been able to look in the planet_osm_rels table for relation membership, but the members are stored in an array, and searching those arrays for membership, even on a bbox-restricted subset, is really slow. Is there any way to do this faster? If not, I suppose I can file a feature request against osm2pgsql for an indexed relation membership table.
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