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// Confirms the $planCacheStats output format includes information about failed plans.
(function() {
"use strict";
load("jstests/libs/sbe_util.js"); // For checkSBEEnabled.
const conn = MongoRunner.runMongod();
assert.neq(null, conn, "mongod was unable to start up");
const testDB = conn.getDB("jstests_plan_cache_list_failed_plans");
const coll = testDB.test;
if (checkSBEEnabled(testDB)) {
jsTest.log("Skipping test because SBE is enabled");
MongoRunner.stopMongod(conn);
return;
}
coll.drop();
// Setup the database such that it will generate a failing plan and a succeeding plan.
const numDocs = 32;
const smallNumber = 10;
assert.commandWorked(testDB.adminCommand(
{setParameter: 1, internalQueryMaxBlockingSortMemoryUsageBytes: smallNumber}));
assert.commandWorked(testDB.adminCommand({setParameter: 1, allowDiskUseByDefault: false}));
for (let i = 0; i < numDocs * 2; ++i)
assert.commandWorked(coll.insert({a: ((i >= (numDocs * 2) - smallNumber) ? 1 : 0), d: i}));
// Create the indexes to create competing plans.
assert.commandWorked(coll.createIndex({a: 1}));
assert.commandWorked(coll.createIndex({d: 1}));
// Assert that the find command found documents.
assert.eq(smallNumber, coll.find({a: 1}).sort({d: 1}).itcount());
// We expect just one plan cache entry.
const planCacheContents = coll.getPlanCache().list();
assert.eq(planCacheContents.length, 1, planCacheContents);
const planCacheEntry = planCacheContents[0];
// There should have been two candidate plans evaluated when the plan cache entry was created.
const creationExecStats = planCacheEntry.creationExecStats;
assert.eq(creationExecStats.length, 2, planCacheEntry);
// We expect that the first plan succeed, and the second failed.
assert(!creationExecStats[0].hasOwnProperty("failed"), planCacheEntry);
assert.eq(creationExecStats[1].failed, true, planCacheEntry);
// The failing plan should have a score of 0.
const candidatePlanScores = planCacheEntry.candidatePlanScores;
assert.eq(candidatePlanScores.length, 2, planCacheEntry);
assert.eq(candidatePlanScores[1], 0, planCacheEntry);
MongoRunner.stopMongod(conn);
})();
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