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// Tests the behavior of explain() when used with the aggregation
// pipeline. Explain() should not read or modify the plan cache.
(function() {
"use strict";
load('jstests/libs/analyze_plan.js'); // For getAggPlanStage().
let coll = db.explain;
coll.drop();
assert.commandWorked(coll.createIndex({x: 1}));
assert.commandWorked(coll.createIndex({y: 1}));
let result = coll.explain().aggregate([{$match: {x: 1, y: 1}}]);
assert.eq(null, getAggPlanStage(result, "CACHED_PLAN"));
// At this point, there should be no entries in the plan cache.
result = coll.explain().aggregate([{$match: {x: 1, y: 1}}]);
assert.eq(null, getAggPlanStage(result, "CACHED_PLAN"));
// Now add entry in the cache without explain().
result = coll.aggregate([{$match: {x: 1, y: 1}}]);
// Now there's an entry in the cache, make sure explain() doesn't use it.
result = coll.explain().aggregate([{$match: {x: 1, y: 1}}]);
assert.eq(null, getAggPlanStage(result, "CACHED_PLAN"));
})();
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