jstests/core/aggregation_accepts_write_concern.js


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/**
 * Confirms that the aggregate command accepts writeConcern regardless of whether the pipeline
 * writes or is read-only.
 * @tags: [assumes_write_concern_unchanged, does_not_support_stepdowns]
 */
(function() {
"use strict";

const testDB = db.getSiblingDB("aggregation_accepts_write_concern");
assert.commandWorked(testDB.dropDatabase());
const collName = "test";

assert.commandWorked(
    testDB.runCommand({insert: collName, documents: [{_id: 1}], writeConcern: {w: "majority"}}));

// A read-only aggregation accepts writeConcern.
assert.commandWorked(testDB.runCommand({
    aggregate: collName,
    pipeline: [{$match: {_id: 1}}],
    cursor: {},
    writeConcern: {w: "majority"}
}));

// An aggregation pipeline that writes accepts writeConcern.
assert.commandWorked(testDB.runCommand({
    aggregate: collName,
    pipeline: [{$match: {_id: 1}}, {$out: collName + "_out"}],
    cursor: {},
    writeConcern: {w: "majority"}
}));
})();