53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
// $unwind applied to an empty array field drops the field from the source document. SERVER-6131
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t = db.jstests_aggregation_server6131;
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t.drop();
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function assertAggregationResults(expected, aggregation) {
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assert.eq(expected, t.aggregate(aggregation).toArray());
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}
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t.drop();
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// An empty array document is dropped.
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t.save({_id: 0, a: 1, b: [], c: 2});
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assertAggregationResults([], {$unwind: '$b'});
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// Values from a nonempty array in another document are unwound.
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t.save({_id: 1, b: [4, 5]});
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assertAggregationResults([{_id: 1, b: 4}, {_id: 1, b: 5}], {$unwind: '$b'});
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// Another empty array document is dropped.
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t.save({_id: 2, b: []});
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assertAggregationResults([{_id: 1, b: 4}, {_id: 1, b: 5}], {$unwind: '$b'});
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t.drop();
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// A nested empty array document is dropped.
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t.save({_id: 0, a: 1, b: {x: 10, y: [], z: 20}, c: 2});
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assertAggregationResults([], {$unwind: '$b.y'});
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t.drop();
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// A null value document is dropped.
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t.save({_id: 0, a: 1, b: null, c: 2});
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assertAggregationResults([], {$unwind: '$b'});
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t.drop();
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// A missing value causes the document to be dropped.
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t.save({_id: 0, a: 1, c: 2});
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assertAggregationResults([], {$unwind: '$b'});
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t.drop();
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// A missing value in an existing nested object causes the document to be dropped.
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t.save({_id: 0, a: 1, b: {d: 4}, c: 2});
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assertAggregationResults([], {$unwind: '$b.y'});
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t.drop();
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// A missing value in a missing nested object causes the document to be dropped.
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t.save({_id: 0, a: 1, b: 10, c: 2});
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assertAggregationResults([], {$unwind: '$b.y'});
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