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/**
* Tests that $** indexes works with returnKey option.
* TODO: SERVER-36198: Move this test back to jstests/core/
*/
(function() {
'use strict';
load("jstests/aggregation/extras/utils.js");
const coll = db.wildcard_return_key;
coll.drop();
const assertArrayEq = (l, r) => assert(arrayEq(l, r), tojson(l) + " != " + tojson(r));
const assertArrayNotEq = (l, r) => assert(!arrayEq(l, r), tojson(l) + " == " + tojson(r));
assert.commandWorked(coll.createIndex({"$**": 1}));
assert.commandWorked(coll.insert({a: 1, b: 2, c: {d: 2, e: 1}}));
assert.commandWorked(coll.insert({a: 2, b: 2, c: {d: 1, e: 2}}));
assert.commandWorked(coll.insert({a: 2, b: 1, c: {d: 2, e: 2}}));
assert.commandWorked(coll.insert({a: 1, b: 1, c: {e: 2}}));
// $** index return key with one field argument.
assertArrayEq(coll.find({a: 1}).returnKey().toArray(),
[{"$_path": "a", a: 1}, {"$_path": "a", a: 1}]);
// $** index return key with dot path argument.
assertArrayEq(coll.find({"c.e": 1}).returnKey().toArray(), [{"$_path": "c.e", "c.e": 1}]);
assert.commandWorked(coll.createIndex({"a": 1}));
// $** index return key with competing regular index.
assertArrayEq(coll.find({a: 1}).hint({"$**": 1}).returnKey().toArray(),
[{"$_path": "a", a: 1}, {"$_path": "a", a: 1}]);
assert.commandWorked(coll.createIndex({"a": 1, "b": 1}));
// $** index return key with competing compound index.
assertArrayNotEq(coll.find({a: 1, b: 1}).hint({"$**": 1}).returnKey().toArray(),
[{a: 1, b: 1}]);
assert.commandWorked(coll.insert({a: 2, b: 2, c: {e: 2}, f: [1, 2, 3]}));
assert.commandWorked(coll.insert({a: 2, b: 2, c: {e: 2}, g: [{h: 1}, {i: 2}]}));
// Multikey path $** index return key.
assertArrayEq(coll.find({f: 1}).returnKey().toArray(), [{"$_path": "f", f: 1}]);
// Multikey subobject $** index return key.
assertArrayEq(coll.find({"g.h": 1}).returnKey().toArray(), [{"$_path": "g.h", "g.h": 1}]);
assert.commandWorked(coll.dropIndexes());
assert.commandWorked(coll.createIndex({"c.$**": 1}));
// Path specified $** index return key.
assertArrayEq(coll.find({"c.d": 1}).returnKey().toArray(), [{"$_path": "c.d", "c.d": 1}]);
// Path specified $** index return key with irrelevant query. We expect this query to be
// answered with a COLLSCAN, in which case returnKey is expected to return empty objects.
assertArrayEq(coll.find({a: 1, b: 1}).returnKey().toArray(), [{}]);
})();
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