73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
/**
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* Utilities for writing tests for the cost-based ranker (CBR).
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*/
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// Round the given number to the nearest 0.1
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function round(num) {
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return Math.round(num * 10) / 10;
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}
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// Compare two cardinality estimates with approximate equality. This is done so that our tests can
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// be robust to floating point rounding differences but detect large changes in estimation
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// indicating a real change in estimation behavior.
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export function ceEqual(lhs, rhs) {
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return Math.abs(round(lhs) - round(rhs)) < 0.1;
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}
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function planEstimateTypeIs(plan, type) {
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return plan.estimatesMetadata.ceSource === type;
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}
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// Return true if the plan was estimated with a histogam estimation source. Return false otherwise.
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export function planEstimatedWithHistogram(plan) {
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return planEstimateTypeIs(plan, "Histogram");
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}
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/**
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* Returns whether the given plan was costed or not.
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*/
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export function isPlanCosted(plan) {
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return plan.hasOwnProperty("costEstimate");
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}
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/**
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* Assert the given plan was not costed. This is used as an indicator to whether CBR used its
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* fallback to multiplanning for this plan.
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*/
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export function assertPlanNotCosted(plan) {
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assert(!isPlanCosted(plan), plan);
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}
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/**
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* Assert the given plan was costed.
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*/
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export function assertPlanCosted(plan) {
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assert(isPlanCosted(plan), plan);
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}
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export function getPlanRankerMode(db) {
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if (db !== null) {
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const getParam = db.adminCommand({
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getParameter: 1,
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planRankerMode: 1,
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});
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return getParam.hasOwnProperty("planRankerMode") ? getParam.planRankerMode : "multiPlanning";
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} else {
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return TestData.setParameters.planRankerMode ? TestData.setParameters.planRankerMode : "multiPlanning";
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}
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}
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export function getMultiplanningBatchSize() {
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const result = db.adminCommand({
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getParameter: 1,
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internalQueryPlanEvaluationMaxResults: 1,
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});
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if (result.ok === 1) {
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return result.internalQueryPlanEvaluationMaxResults;
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} else {
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throw new Error("Failed to retrieve multiplanning batch size: " + JSON.stringify(result));
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}
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}
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