36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
// SERVER-533: Aggregation stage to randomly sample documents.
|
|
|
|
// For assertErrorCode.
|
|
load('jstests/aggregation/extras/utils.js');
|
|
|
|
(function() {
|
|
'use strict';
|
|
|
|
var coll = db.agg_sample;
|
|
coll.drop();
|
|
|
|
// Should return no results on a collection that doesn't exist. Should not crash.
|
|
assert.eq(coll.aggregate([{$sample: {size: 10}}]).toArray(), []);
|
|
|
|
var nItems = 3;
|
|
for (var i = 0; i < nItems; i++) {
|
|
assert.writeOK(coll.insert({_id: i}));
|
|
}
|
|
|
|
[0, 1, nItems, nItems + 1].forEach(function(size) {
|
|
var results = coll.aggregate([{$sample: {size: size}}]).toArray();
|
|
assert.eq(results.length, Math.min(size, nItems));
|
|
});
|
|
|
|
// Multiple $sample stages are allowed.
|
|
var results = coll.aggregate([{$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);
|
|
}());
|