20 lines
713 B
JavaScript
20 lines
713 B
JavaScript
/*
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* Test that $group works when an empty object is passed for _id. This is intended to reproduce
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* SERVER-89611.
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*/
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const coll = db.group_by_empty_obj;
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coll.drop();
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assert.commandWorked(coll.insert([{_id: 1, x: 1}, {_id: 2, x: 2}]));
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function assertIsEmptyObjId(groupSpec) {
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assert.eq([{_id: {}}], coll.aggregate([groupSpec]).toArray());
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}
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assertIsEmptyObjId({$group: {_id: {}}});
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assertIsEmptyObjId({$group: {_id: {$expr: {}}}});
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assertIsEmptyObjId({$group: {_id: {$expr: {$const: {}}}}});
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assertIsEmptyObjId({$group: {_id: {$expr: {$expr: {}}}}});
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// The original fuzzer failure involved a $sortByCount query
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assert.eq([{_id: {}, count: 2}], coll.aggregate([{$sortByCount: {$expr: {}}}]).toArray());
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