17 lines
445 B
JavaScript
17 lines
445 B
JavaScript
/*
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* Test that $group works when Nothing is passed in for _id. This is intended to reproduce
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* SERVER-90185.
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*/
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const coll = db.group_set_window_fields;
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coll.drop();
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assert.commandWorked(coll.insert({_id: 1}));
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const pipeline =
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[{$setWindowFields: {output: {obj: {$first: null}}}}, {$group: {_id: "$obj.nonexistent"}}];
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const expected = [{_id: null}];
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const results = coll.aggregate(pipeline).toArray();
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assert.eq(results, expected);
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