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