34 lines
1.3 KiB
JavaScript
34 lines
1.3 KiB
JavaScript
/**
|
|
* Test that $group can generate documents larger than maximum BSON size, as long as only part of
|
|
* such document is returned to the client.
|
|
* @tags: [
|
|
* # For sharded collections, we pushdown $group to shards to perform pre-aggregation and then
|
|
* # compute the final result on mongos. Since $group executed on shard produces documents larger
|
|
* # than maximum BSON size, we cannot serialize the result and send it to mongos. Such problem
|
|
* # does not exist in standalone and replica set setups.
|
|
* assumes_against_mongod_not_mongos,
|
|
* ]
|
|
*/
|
|
import {arrayEq} from "jstests/aggregation/extras/utils.js";
|
|
|
|
const coll = db.group_large_documents_local;
|
|
coll.drop();
|
|
|
|
const largeString = 'x'.repeat(10 * 1024 * 1024);
|
|
for (let i = 0; i < 7; ++i) {
|
|
assert.commandWorked(coll.insert({key: 1, largeField: largeString}));
|
|
}
|
|
|
|
for (let preventProjectPushdown of [false, true]) {
|
|
const pipeline = [{$group: {_id: "$key", out: {$push: "$largeField"}}}];
|
|
if (preventProjectPushdown) {
|
|
pipeline.push({$_internalInhibitOptimization: {}});
|
|
}
|
|
pipeline.push({$project: {_id: 0, a: {$add: [1, "$_id"]}}});
|
|
|
|
const results = coll.aggregate(pipeline).toArray();
|
|
|
|
assert(arrayEq(results, [{a: 2}]),
|
|
"Pipeline:\n" + tojson(pipeline) + "Actual results:\n" + tojson(results));
|
|
}
|