27 lines
890 B
JavaScript
27 lines
890 B
JavaScript
/*
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* Test that $group works when $$ROOT is passed for _id. This is intended to reproduce
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* SERVER-37459.
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*/
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(function() {
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"use strict";
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const coll = db.group_by_system_var;
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coll.drop();
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assert.commandWorked(coll.insert({_id: 1, x: 1}));
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assert.commandWorked(coll.insert({_id: 2, x: 2}));
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function checkPipeline(pipeline, expectedResults) {
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const res = coll.aggregate(pipeline).toArray();
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assert.eq(res, expectedResults, pipeline);
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}
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const wholeCollUnderId = [{_id: {_id: 1, x: 1}}, {_id: {_id: 2, x: 2}}];
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checkPipeline([{$group: {_id: "$$ROOT"}}, {$sort: {"_id": 1}}], wholeCollUnderId);
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checkPipeline([{$group: {_id: "$$CURRENT"}}, {$sort: {"_id": 1}}], wholeCollUnderId);
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const collIds = [{_id: 1}, {_id: 2}];
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checkPipeline([{$group: {_id: "$$ROOT.x"}}, {$sort: {"_id": 1}}], collIds);
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checkPipeline([{$group: {_id: "$$CURRENT.x"}}, {$sort: {"_id": 1}}], collIds);
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})();
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