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// @tags: [
// # mapReduce does not support afterClusterTime.
// does_not_support_causal_consistency,
// does_not_support_stepdowns,
// ]
t = db.mr_index;
t.drop();
outName = "mr_index_out";
out = db[outName];
out.drop();
t.insert({tags: [1]});
t.insert({tags: [1, 2]});
t.insert({tags: [1, 2, 3]});
t.insert({tags: [3]});
t.insert({tags: [2, 3]});
t.insert({tags: [2, 3]});
t.insert({tags: [1, 2]});
m = function() {
for (i = 0; i < this.tags.length; i++)
emit(this.tags[i], 1);
};
r = function(k, vs) {
return Array.sum(vs);
};
ex = function() {
return out.find().sort({value: 1}).explain("executionStats");
};
res = t.mapReduce(m, r, {out: outName});
assert.eq(3, ex().executionStats.nReturned, "A1");
out.ensureIndex({value: 1});
assert.eq(3, ex().executionStats.nReturned, "A2");
res = t.mapReduce(m, r, {out: outName});
assert.eq(3, ex().executionStats.nReturned, "B1");
res.drop();
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