OrderBy(Project(Extend(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?issue, SAMPLE,
                                                     {},
                                                     G1=Group((?issue,
                                                        ?number),
                                                        Filter((?priority > 0) && (?priority <= ?count),
                                                        Join(BGP( ?issue <http://github.com/w3c/sparql-12/issues#number> ?number),
                                                        Join(Project(Extend(BGP( ?issue <http://github.com/w3c/sparql-12/issues#priority> ?priority),
                                                                     ?count,
                                                                     count(?issue, <KEYWORD/DISTINCT>, distinct) ),
                                                             {?count}),
                                                        Graph(?vote,
                                                        BGP( ?issue <http://github.com/w3c/sparql-12/issues#priority> ?priority))))))),
                                                     Aggregation(??agg2: ?priority, AVG,
                                                     {}, G1),
                                                     Aggregation(??agg3: ?number, SAMPLE,
                                                     {}, G1)),
                                     ?issue,
                                     ??agg1),
                              ?average_priority,
                              ??agg2),
                       ?number,
                       ??agg3),
                {?issue, ?average_priority, ?number}), (?average_priority ?number))