42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
// @tags: [
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// assumes_balancer_off,
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// requires_non_retryable_writes,
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// requires_fcv_80,
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// ]
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// Basic test which checks the number of documents returned, keys examined, and documents
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// examined as reported by explain.
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const colName = jsTestName();
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let t = db.getCollection(colName);
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t.drop();
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t.createIndex({a: 1, b: 1});
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t.createIndex({b: 1, a: 1});
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t.save({a: 0, b: 1});
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t.save({a: 1, b: 0});
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let explain = t.find({a: {$gte: 0}, b: {$gte: 0}}).explain(true);
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assert.eq(2, explain.executionStats.nReturned);
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assert.eq(2, explain.executionStats.totalKeysExamined);
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assert.eq(2, explain.executionStats.totalDocsExamined);
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// A limit of 2.
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explain = t.find({a: {$gte: 0}, b: {$gte: 0}}).limit(-2).explain(true);
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assert.eq(2, explain.executionStats.nReturned);
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// A $or query.
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explain = t.find({$or: [{a: {$gte: 0}, b: {$gte: 1}}, {a: {$gte: 1}, b: {$gte: 0}}]}).explain(true);
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assert.eq(2, explain.executionStats.nReturned);
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// A non $or case where totalKeysExamined != number of results
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t.remove({});
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t.save({a: '0', b: '1'});
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t.save({a: '1', b: '0'});
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explain = t.find({a: /0/, b: /1/}).explain(true);
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assert.eq(1, explain.executionStats.nReturned);
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assert.eq(2, explain.executionStats.totalKeysExamined);
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