t = db.mr5;
t.drop();

t.save({"partner": 1, "visits": 9});
t.save({"partner": 2, "visits": 9});
t.save({"partner": 1, "visits": 11});
t.save({"partner": 1, "visits": 30});
t.save({"partner": 2, "visits": 41});
t.save({"partner": 2, "visits": 41});

m = function() {
    emit(this.partner, {stats: [this.visits]});
};

r = function(k, v) {
    var stats = [];
    var total = 0;
    for (var i = 0; i < v.length; i++) {
        for (var j in v[i].stats) {
            stats.push(v[i].stats[j]);
            total += v[i].stats[j];
        }
    }
    return {
        stats: stats,
        total: total
    };
};

res = t.mapReduce(m, r, {out: "mr5_out", scope: {xx: 1}});
// res.find().forEach( printjson )

z = res.convertToSingleObject();
assert.eq(2, Object.keySet(z).length, "A1");
assert.eq([9, 11, 30], z["1"].stats, "A2");
assert.eq([9, 41, 41], z["2"].stats, "A3");

res.drop();

m = function() {
    var x = "partner";
    var y = "visits";
    emit(this [x],
         {
             stats:
                 [this[y]]
         });
};

res = t.mapReduce(m, r, {out: "mr5_out", scope: {xx: 1}});
// res.find().forEach( printjson )

z = res.convertToSingleObject();
assert.eq(2, Object.keySet(z).length, "B1");
assert.eq([9, 11, 30], z["1"].stats, "B2");
assert.eq([9, 41, 41], z["2"].stats, "B3");

res.drop();