33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
/**
|
|
* Utilities for writing tests for the cost-based ranker (CBR).
|
|
*/
|
|
|
|
// Round the given number to the nearest 0.1
|
|
function round(num) {
|
|
return Math.round(num * 10) / 10;
|
|
}
|
|
|
|
// Compare two cardinality estimates with approximate equality. This is done so that our tests can
|
|
// be robust to floating point rounding differences but detect large changes in estimation
|
|
// indicating a real change in estimation behavior.
|
|
export function ceEqual(lhs, rhs) {
|
|
return Math.abs(round(lhs) - round(rhs)) < 0.1;
|
|
}
|
|
|
|
function planEstimateTypeIs(plan, type) {
|
|
return plan.estimatesMetadata.ceSource === type;
|
|
}
|
|
|
|
// Return true if the plan was estimated with a histogam estimation source. Return false otherwise.
|
|
export function planEstimatedWithHistogram(plan) {
|
|
return planEstimateTypeIs(plan, "Histogram");
|
|
}
|
|
|
|
/**
|
|
* Assert the given plan was not costed. This is used as an indicator to whether CBR used its
|
|
* fallback to multiplanning for this plan.
|
|
*/
|
|
export function assertPlanNotCosted(plan) {
|
|
assert(!plan.hasOwnProperty('costEstimate'), plan);
|
|
}
|