18 lines
498 B
JavaScript
18 lines
498 B
JavaScript
/**
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* Tests that a group _id with an array is evaluated whether it is at the top level or
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* nested.
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*/
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(function() {
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"use strict";
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const coll = db.group_with_arrays;
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coll.drop();
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assert.commandWorked(coll.insert([{x: null}, {y: null}, {x: null, y: null}]));
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const arr_result = coll.aggregate([{$group: {_id: ["$x", "$y"]}}]);
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const nested_result = coll.aggregate([{$group: {_id: {z: ["$x", "$y"]}}}]);
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assert.eq(arr_result.toArray()[0]["_id"], nested_result.toArray()[0]["_id"]["z"]);
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}());
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