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// @tags: [
// # mapReduce does not support afterClusterTime.
// does_not_support_causal_consistency,
// does_not_support_stepdowns,
// sbe_incompatible,
// uses_map_reduce_with_temp_collections,
// ]
(function() {
"use strict";
const testName = "mr_reduce_merge_other_db";
const testDB = db.getSiblingDB(testName);
const coll = testDB.mr_replace;
coll.drop();
assert.commandWorked(coll.insert([{a: [1, 2]}, {a: [2, 3]}, {a: [3, 4]}]));
const outCollStr = "mr_replace_col_" + testName;
const outDbStr = "mr_db_" + testName;
const outDb = db.getMongo().getDB(outDbStr);
const outColl = outDb[outCollStr];
const mapFn = function() {
for (i = 0; i < this.a.length; i++)
emit(this.a[i], 1);
};
const reduceFn = function(k, vs) {
return Array.sum(vs);
};
(function testMerge() {
outColl.drop();
assert.commandWorked(
outColl.insert([{_id: 1, value: "something else"}, {_id: 5, value: "existing"}]));
let res = assert.commandWorked(
coll.mapReduce(mapFn, reduceFn, {out: {merge: outCollStr, db: outDbStr}}));
const expected = [
{_id: 1, value: 1},
{_id: 2, value: 2},
{_id: 3, value: 2},
{_id: 4, value: 1},
{_id: 5, value: "existing"}
];
let actual = outColl.find().sort({_id: 1}).toArray();
assert.eq(expected, actual);
})();
(function testReduce() {
outColl.drop();
assert.commandWorked(outColl.insert([{_id: 1, value: 100}, {_id: 5, value: 0}]));
let res = assert.commandWorked(
coll.mapReduce(mapFn, reduceFn, {out: {reduce: outCollStr, db: outDbStr}}));
const expected = [
{_id: 1, value: 101},
{_id: 2, value: 2},
{_id: 3, value: 2},
{_id: 4, value: 1},
{_id: 5, value: 0}
];
let actual = outColl.find().sort({_id: 1}).toArray();
assert.eq(expected, actual);
})();
}());
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