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// @tags: [
// # mapReduce does not support afterClusterTime.
// does_not_support_causal_consistency,
// does_not_support_stepdowns,
// uses_map_reduce_with_temp_collections,
// ]
t = db.mr_undef;
t.drop();
outname = "mr_undef_out";
out = db[outname];
out.drop();
t.insert({x: 0});
var m = function() {
emit(this.mod, this.x);
};
var r = function(k, v) {
total = 0;
for (i in v) {
total += v[i];
}
return total;
};
res = t.mapReduce(m, r, {out: outname});
assert.eq(0, out.find({_id: {$type: 6}}).itcount(), "A1");
assert.eq(1, out.find({_id: {$type: 10}}).itcount(), "A2");
x = out.findOne();
assert.eq(x, out.findOne({_id: x["_id"]}), "A3");
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