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/**
* Tests that 'internalCostModelCoefficients' can be set on startup.
*/
(function() {
'use strict';
load("jstests/libs/optimizer_utils.js"); // For checkCascadesOptimizerEnabled.
function getScanCostWith(customScanCost) {
const costStr = `{"scanIncrementalCost": ${customScanCost}}`;
const conn = MongoRunner.runMongod({setParameter: {'internalCostModelCoefficients': costStr}});
const db = conn.getDB(jsTestName());
const coll = db.start_up_with_custom_cost_model;
const qfc = db.adminCommand({getParameter: 1, internalQueryFrameworkControl: 1});
if (!checkCascadesOptimizerEnabled(db) || qfc === "forceClassicEngine") {
jsTestLog("Skipping test because the Cascades optimizer is not enabled");
MongoRunner.stopMongod(conn);
return;
}
assert.commandWorked(
db.adminCommand({setParameter: 1, internalQueryFrameworkControl: "forceBonsai"}));
const nDocuments = 100;
assert.commandWorked(coll.insert(Array.from({length: nDocuments}, (_, i) => {
return {a: 3, b: 3, c: i};
})));
// Get scan cost.
const explain = coll.explain("executionStats").aggregate([]);
assert.eq(nDocuments, explain.executionStats.nReturned);
const internalCost =
assert.commandWorked(db.adminCommand({getParameter: 1, internalCostModelCoefficients: 1}));
assert(internalCost.hasOwnProperty("internalCostModelCoefficients"));
assert.eq(internalCost['internalCostModelCoefficients'], costStr);
const scanNode = navigateToPlanPath(explain, "child");
assertValueOnPath("PhysicalScan", scanNode, "nodeType");
const scanCost = scanNode.properties.cost;
MongoRunner.stopMongod(conn);
return scanCost;
}
const scanCost1 = getScanCostWith(0.2);
const scanCost2 = getScanCostWith(0.4);
if (scanCost1 === undefined) {
return;
}
assert.lt(scanCost1, scanCost2);
}());
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