39 lines
1.5 KiB
JavaScript
39 lines
1.5 KiB
JavaScript
// SERVER-533: Aggregation stage to randomly sample documents.
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import {assertErrorCode} from "jstests/aggregation/extras/utils.js";
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import {assertDropAndRecreateCollection} from "jstests/libs/collection_drop_recreate.js";
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const coll = assertDropAndRecreateCollection(db, "agg_sample");
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coll.drop();
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// Should return no results on a collection that doesn't exist. Should not crash.
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assert.eq(coll.aggregate([{$sample: {size: 10}}]).toArray(), []);
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const nItems = 3;
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for (let i = 0; i < nItems; i++) {
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assert.commandWorked(coll.insert({_id: i}));
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}
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[1, nItems, nItems + 1].forEach(function(size) {
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const results = coll.aggregate([{$sample: {size: size}}]).toArray();
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assert.eq(results.length, Math.min(size, nItems));
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});
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// Multiple $sample stages are allowed.
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const results = coll.aggregate([{$sample: {size: nItems}}, {$sample: {size: 1}}]).toArray();
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assert.eq(results.length, 1);
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// Invalid options.
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assertErrorCode(coll, [{$sample: 'string'}], 28745);
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assertErrorCode(coll, [{$sample: {size: 'string'}}], 28746);
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assertErrorCode(coll, [{$sample: {size: -1}}], 28747);
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assertErrorCode(coll, [{$sample: {unknownOpt: true}}], 28748);
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assertErrorCode(coll, [{$sample: {/* no size */}}], 28749);
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// TODO(SERVER-94154): Remove version check here.
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const fcvDoc = db.adminCommand({getParameter: 1, featureCompatibilityVersion: 1});
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if (MongoRunner.compareBinVersions(fcvDoc.featureCompatibilityVersion.version, "8.1") >= 0) {
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// Using a sample of size zero is only disallowed in some newer versions.
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assertErrorCode(coll, [{$sample: {size: 0}}], 28747);
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}
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