Files
mongo/jstests/aggregation/sources/sample/agg_sample.js
Zac 591928c619 SERVER-108478 JS formatted by prettier and remove clang-format (#39656)
GitOrigin-RevId: 6c8f6aded47f260aa4f7c231b17dae3302cb1e04
2025-08-21 17:27:09 +00:00

49 lines
1.6 KiB
JavaScript

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