25 lines
815 B
JavaScript
25 lines
815 B
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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