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// This test validates that map/reduce runs intermediate reduce steps in order to keep the
// in-memory state small. See SERVER-12949 for more details.
load("jstests/aggregation/extras/utils.js"); // For resultsEq
(function() {
"use strict";
function assertGLEOK(status) {
assert(status.ok && status.err === null, "Expected OK status object; found " + tojson(status));
}
db = db.getSisterDB("MapReduceTestDB");
db.dropDatabase();
var coll = db.getCollection("mrInput");
// Insert 10 x 49 elements (10 i-s, 49 j-s)
var expectedOutColl = [];
var bulk = coll.initializeUnorderedBulkOp();
for (var i = 0; i < 10; i++) {
for (var j = 1; j < 50; j++) {
bulk.insert({idx: i, j: j});
}
expectedOutColl.push({_id: i, value: j - 1});
}
assert.commandWorked(bulk.execute());
function mapFn() {
emit(this.idx, 1);
}
function reduceFn(key, values) {
return Array.sum(values);
}
var out = coll.mapReduce(mapFn, reduceFn, {out: {replace: "mrOutput"}});
// Check the output is as expected
var outColl = db.getCollection("mrOutput").find().toArray();
assert(resultsEq(outColl, expectedOutColl));
})();
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