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/**
* Tests that a count will ask the record store for the count when the query predicate is empty, or
* logically empty. See SERVER-20536 for more details.
*/
load("jstests/libs/analyze_plan.js"); // For 'planHasStage'.
(function() {
"use strict";
var coll = db.record_store_count;
coll.drop();
assert.writeOK(coll.insert({x: 0}));
assert.writeOK(coll.insert({x: 1}));
assert.commandWorked(coll.ensureIndex({x: 1}));
//
// Logically empty predicates should use the record store's count.
//
var explain = coll.explain().count({});
assert(!planHasStage(explain.queryPlanner.winningPlan, "COLLSCAN"));
explain = coll.explain().count({$comment: "hi"});
assert(!planHasStage(explain.queryPlanner.winningPlan, "COLLSCAN"));
//
// A non-empty query predicate should prevent the use of the record store's count.
//
explain = coll.explain().find({x: 0}).count();
assert(planHasStage(explain.queryPlanner.winningPlan, "COUNT_SCAN"));
explain = coll.explain().find({x: 0, $comment: "hi"}).count();
assert(planHasStage(explain.queryPlanner.winningPlan, "COUNT_SCAN"));
explain = coll.explain().find({x: 0}).hint({x: 1}).count();
assert(planHasStage(explain.queryPlanner.winningPlan, "COUNT_SCAN"));
explain = coll.explain().find({x: 0, $comment: "hi"}).hint({x: 1}).count();
assert(planHasStage(explain.queryPlanner.winningPlan, "COUNT_SCAN"));
})();
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