27 lines
964 B
JavaScript
27 lines
964 B
JavaScript
t = db["jstests_coveredIndex2"];
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t.drop();
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// Include helpers for analyzing explain output.
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load("jstests/libs/analyze_plan.js");
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t.save({a: 1});
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t.save({a: 2});
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assert.eq(t.findOne({a: 1}).a, 1, "Cannot find right record");
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assert.eq(t.count(), 2, "Not right length");
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// use simple index
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t.ensureIndex({a: 1});
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var plan = t.find({a: 1}).explain();
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assert(!isIndexOnly(plan.queryPlanner.winningPlan),
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"Find using covered index but all fields are returned");
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var plan = t.find({a: 1}, {a: 1}).explain();
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assert(!isIndexOnly(plan.queryPlanner.winningPlan), "Find using covered index but _id is returned");
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var plan = t.find({a: 1}, {a: 1, _id: 0}).explain();
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assert(isIndexOnly(plan.queryPlanner.winningPlan), "Find is not using covered index");
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// add multikey
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t.save({a: [3, 4]});
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var plan = t.find({a: 1}, {a: 1, _id: 0}).explain();
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assert(!isIndexOnly(plan.queryPlanner.winningPlan),
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"Find is using covered index even after multikey insert");
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