mongodb/jstests/core/mr_index3.js

// @tags: [
//   # mapReduce does not support afterClusterTime.
//   does_not_support_causal_consistency,
//   does_not_support_stepdowns,
// ]

t = db.mr_index3;
t.drop();

t.insert({_id: 1, name: 'name1', tags: ['dog', 'cat']});
t.insert({_id: 2, name: 'name2', tags: ['cat']});
t.insert({_id: 3, name: 'name3', tags: ['mouse', 'cat', 'dog']});
t.insert({_id: 4, name: 'name4', tags: []});

m = function() {
    for (var i = 0; i < this.tags.length; i++)
        emit(this.tags[i], 1);
};

r = function(key, values) {
    return Array.sum(values);
};

a1 = db.runCommand({mapreduce: 'mr_index3', map: m, reduce: r, out: {inline: true}}).results;
a2 = db.runCommand(
           {mapreduce: 'mr_index3', map: m, reduce: r, query: {name: 'name1'}, out: {inline: true}})
         .results;
a3 = db.runCommand({
           mapreduce: 'mr_index3',
           map: m,
           reduce: r,
           query: {name: {$gt: 'name'}},
           out: {inline: true}
       }).results;

assert.eq([{"_id": "cat", "value": 3}, {"_id": "dog", "value": 2}, {"_id": "mouse", "value": 1}],
          a1,
          "A1");
assert.eq([{"_id": "cat", "value": 1}, {"_id": "dog", "value": 1}], a2, "A2");
assert.eq(a1, a3, "A3");

t.ensureIndex({name: 1, tags: 1});

b1 = db.runCommand({mapreduce: 'mr_index3', map: m, reduce: r, out: {inline: true}}).results;
b2 = db.runCommand(
           {mapreduce: 'mr_index3', map: m, reduce: r, query: {name: 'name1'}, out: {inline: true}})
         .results;
b3 = db.runCommand({
           mapreduce: 'mr_index3',
           map: m,
           reduce: r,
           query: {name: {$gt: 'name'}},
           out: {inline: true}
       }).results;

assert.eq(a1, b1, "AB1");
assert.eq(a2, b2, "AB2");
assert.eq(a3, b3, "AB3");