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// Cannot implicitly shard accessed collections because of following errmsg: Cannot output to a
// non-sharded collection because sharded collection exists already.
// @tags: [assumes_unsharded_collection, does_not_support_stepdowns]
t = db.mr_merge2;
t.drop();
t.insert({a: [1, 2]});
t.insert({a: [2, 3]});
t.insert({a: [3, 4]});
outName = "mr_merge2_out";
out = db[outName];
out.drop();
m = function() {
for (i = 0; i < this.a.length; i++)
emit(this.a[i], 1);
};
r = function(k, vs) {
return Array.sum(vs);
};
function tos(o) {
var s = "";
for (var i = 0; i < 100; i++) {
if (o[i])
s += i + "_" + o[i] + "|";
}
return s;
}
outOptions = {
out: {merge: outName}
};
res = t.mapReduce(m, r, outOptions);
expected = {
"1": 1,
"2": 2,
"3": 2,
"4": 1
};
assert.eq(tos(expected), tos(res.convertToSingleObject()), "A");
t.insert({a: [4, 5]});
res = t.mapReduce(m, r, outOptions);
expected["4"]++;
expected["5"] = 1;
assert.eq(tos(expected), tos(res.convertToSingleObject()), "B");
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