37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
/**
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* Tests for explaining an aggregation pipeline which uses the $sample stage.
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* @tags: [
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* assumes_read_concern_local,
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* ]
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*/
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(function() {
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"use strict";
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load("jstests/libs/analyze_plan.js");
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const coll = db.explain_sample;
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coll.drop();
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let docsToInsert = [];
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for (let i = 0; i < 1000; ++i) {
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docsToInsert.push({_id: i});
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}
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assert.commandWorked(coll.insert(docsToInsert));
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// Verify that explain reports execution stats for the MULTI_ITERATOR stage. This is designed to
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// reproduce SERVER-35973.
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const explain =
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assert.commandWorked(coll.explain("allPlansExecution").aggregate([{$sample: {size: 10}}]));
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const multiIteratorStages = getAggPlanStages(explain, "MULTI_ITERATOR");
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assert.gt(multiIteratorStages.length, 0, tojson(explain));
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assert.gt(multiIteratorStages.reduce((acc, stage) => acc + stage.nReturned, 0),
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0,
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tojson(multiIteratorStages));
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assert.gt(multiIteratorStages.reduce((acc, stage) => acc + stage.advanced, 0),
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0,
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tojson(multiIteratorStages));
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assert.gt(multiIteratorStages.reduce((acc, stage) => acc + stage.works, 0),
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0,
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tojson(multiIteratorStages));
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}());
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