Version 1.1
For the ON clause, create a table mr_driver once, with no rows. For example:
SELECT * FROM GeometryLoader ( ON mr_driver Path ('input_path' [,...]) [ Host ('afs_server_ip_address') ] [ Port ('afs_server_port_number') ] [ InputFormat ({ 'kml' | 'geojson' | 'shp' | 'mapinfo' }) ] [ OutputFormat ({ 'wkt' | 'json' | 'kml' | 'gml' }) ] [ OutputAttributes ('colname [ coltype ]' [,...]) ] );