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// Cannot implicitly shard accessed collections because queries on a sharded collection are not
// able to be covered when they aren't on the shard key since the document needs to be fetched in
// order to apply the SHARDING_FILTER stage.
// @tags: [
// assumes_unsharded_collection,
// ]
/**
* Tests for returnKey.
*/
load("jstests/libs/analyze_plan.js");
(function() {
'use strict';
var results;
var explain;
var coll = db.jstests_returnkey;
coll.drop();
assert.commandWorked(coll.insert({a: 1, b: 3}));
assert.commandWorked(coll.insert({a: 2, b: 2}));
assert.commandWorked(coll.insert({a: 3, b: 1}));
assert.commandWorked(coll.createIndex({a: 1}));
assert.commandWorked(coll.createIndex({b: 1}));
// Basic returnKey.
results = coll.find().hint({a: 1}).sort({a: 1}).returnKey().toArray();
assert.eq(results, [{a: 1}, {a: 2}, {a: 3}]);
results = coll.find().hint({a: 1}).sort({a: -1}).returnKey().toArray();
assert.eq(results, [{a: 3}, {a: 2}, {a: 1}]);
// Check that the plan is covered.
explain = coll.find().hint({a: 1}).sort({a: 1}).returnKey().explain();
assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
explain = coll.find().hint({a: 1}).sort({a: -1}).returnKey().explain();
assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
// returnKey with an in-memory sort.
results = coll.find().hint({a: 1}).sort({b: 1}).returnKey().toArray();
assert.eq(results, [{a: 3}, {a: 2}, {a: 1}]);
results = coll.find().hint({a: 1}).sort({b: -1}).returnKey().toArray();
assert.eq(results, [{a: 1}, {a: 2}, {a: 3}]);
// Check that the plan is not covered.
explain = coll.find().hint({a: 1}).sort({b: 1}).returnKey().explain();
assert(!isIndexOnly(db, explain.queryPlanner.winningPlan));
explain = coll.find().hint({a: 1}).sort({b: -1}).returnKey().explain();
assert(!isIndexOnly(db, explain.queryPlanner.winningPlan));
// returnKey takes precedence over other a regular inclusion projection. Should still be
// covered.
results = coll.find({}, {b: 1}).hint({a: 1}).sort({a: -1}).returnKey().toArray();
assert.eq(results, [{a: 3}, {a: 2}, {a: 1}]);
explain = coll.find({}, {b: 1}).hint({a: 1}).sort({a: -1}).returnKey().explain();
assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
// returnKey takes precedence over other a regular exclusion projection. Should still be
// covered.
results = coll.find({}, {a: 0}).hint({a: 1}).sort({a: -1}).returnKey().toArray();
assert.eq(results, [{a: 3}, {a: 2}, {a: 1}]);
explain = coll.find({}, {a: 0}).hint({a: 1}).sort({a: -1}).returnKey().explain();
assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
// Unlike other projections, sortKey meta-projection can co-exist with returnKey.
results = coll.find({}, {c: {$meta: 'sortKey'}}).hint({a: 1}).sort({a: -1}).returnKey().toArray();
assert.eq(results, [{a: 3, c: [3]}, {a: 2, c: [2]}, {a: 1, c: [1]}]);
// returnKey with sortKey $meta where there is an in-memory sort.
results = coll.find({}, {c: {$meta: 'sortKey'}}).hint({a: 1}).sort({b: 1}).returnKey().toArray();
assert.eq(results, [{a: 3, c: [1]}, {a: 2, c: [2]}, {a: 1, c: [3]}]);
// returnKey with multiple sortKey $meta projections.
results = coll.find({}, {c: {$meta: 'sortKey'}, d: {$meta: 'sortKey'}})
.hint({a: 1})
.sort({b: 1})
.returnKey()
.toArray();
assert.eq(results, [{a: 3, c: [1], d: [1]}, {a: 2, c: [2], d: [2]}, {a: 1, c: [3], d: [3]}]);
// returnKey with a sortKey $meta projection on a nested field.
results =
coll.find({}, {"c.d": {$meta: "sortKey"}}).hint({a: 1}).sort({b: 1}).returnKey().toArray();
assert.eq(results, [{a: 3, c: {d: [1]}}, {a: 2, c: {d: [2]}}, {a: 1, c: {d: [3]}}]);
})();
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