53 lines
1.7 KiB
JavaScript
53 lines
1.7 KiB
JavaScript
// SERVER-14691: $avg aggregator should return null when it receives no input.
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(function() {
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'use strict';
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var coll = db.accumulate_avg_sum_null;
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// Test the $avg aggregator.
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coll.drop();
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// Null cases.
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assert.commandWorked(coll.insert({a: 1, b: 2, c: 'string', d: null}));
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// Missing field.
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var pipeline = [{$group: {_id: '$a', avg: {$avg: '$missing'}}}];
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: null}]);
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// Non-numeric field.
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pipeline = [{$group: {_id: '$a', avg: {$avg: '$c'}}}];
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: null}]);
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// Field with value of null.
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pipeline = [{$group: {_id: '$a', avg: {$avg: '$d'}}}];
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: null}]);
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// All three.
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coll.insert({a: 1, d: 'string'});
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coll.insert({a: 1});
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pipeline = [{$group: {_id: '$a', avg: {$avg: '$d'}}}];
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: null}]);
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// Non-null cases.
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coll.drop();
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assert.commandWorked(coll.insert({a: 1, b: 2}));
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pipeline = [{$group: {_id: '$a', avg: {$avg: '$b'}}}];
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// One field.
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: 2}]);
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// Two fields.
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assert.commandWorked(coll.insert({a: 1, b: 4}));
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: 3}]);
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// Average of zero should still work.
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assert.commandWorked(coll.insert({a: 1, b: -6}));
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: 0}]);
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// Missing, null, or non-numeric fields should not error or affect the average.
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assert.commandWorked(coll.insert({a: 1}));
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assert.commandWorked(coll.insert({a: 1, b: 'string'}));
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assert.commandWorked(coll.insert({a: 1, b: null}));
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assert.eq(coll.aggregate(pipeline).toArray(), [{_id: 1, avg: 0}]);
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}());
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