Project(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?s, SAMPLE,
                                                  {},
                                                  G1=Group((?s),
                                                     Union(BGP( ?s <http://www.example.org/int> ?o),
                                                     Union(BGP( ?s <http://www.example.org/dec> ?o),
                                                     BGP( ?s <http://www.example.org/double> ?o))))),
                                      Aggregation(??agg2: ?o, MAX, {}, G1)),
                      ?s,
                      ??agg1),
               ?max,
               ??agg2),
        {?s, ?max})