85 lines
2.9 KiB
JavaScript
85 lines
2.9 KiB
JavaScript
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t = db.idhack;
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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.insert({_id: {x: 1}, z: 1});
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t.insert({_id: {x: 2}, z: 2});
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t.insert({_id: {x: 3}, z: 3});
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t.insert({_id: 1, z: 4});
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t.insert({_id: 2, z: 5});
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t.insert({_id: 3, z: 6});
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assert.eq(2, t.findOne({_id: {x: 2}}).z, "A1");
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assert.eq(2, t.find({_id: {$gte: 2}}).count(), "A2");
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assert.eq(2, t.find({_id: {$gte: 2}}).itcount(), "A3");
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t.update({_id: {x: 2}}, {$set: {z: 7}});
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assert.eq(7, t.findOne({_id: {x: 2}}).z, "B1");
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t.update({_id: {$gte: 2}}, {$set: {z: 8}}, false, true);
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assert.eq(4, t.findOne({_id: 1}).z, "C1");
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assert.eq(8, t.findOne({_id: 2}).z, "C2");
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assert.eq(8, t.findOne({_id: 3}).z, "C3");
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// explain output should show that the ID hack was applied.
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var query = {_id: {x: 2}};
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var explain = t.find(query).explain(true);
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print("explain for " + tojson(query, "", true) + " = " + tojson(explain));
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assert.eq(1, explain.executionStats.nReturned, "D1");
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assert.eq(1, explain.executionStats.totalKeysExamined, "D2");
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assert(isIdhack(explain.queryPlanner.winningPlan), "D3");
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// ID hack cannot be used with hint().
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t.ensureIndex({_id: 1, a: 1});
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var hintExplain = t.find(query).hint({_id: 1, a: 1}).explain();
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print("explain for hinted query = " + tojson(hintExplain));
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assert(!isIdhack(hintExplain.queryPlanner.winningPlan), "E1");
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// ID hack cannot be used with skip().
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var skipExplain = t.find(query).skip(1).explain();
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print("explain for skip query = " + tojson(skipExplain));
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assert(!isIdhack(skipExplain.queryPlanner.winningPlan), "F1");
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// Covered query returning _id field only can be handled by ID hack.
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var coveredExplain = t.find(query, {_id: 1}).explain();
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print("explain for covered query = " + tojson(coveredExplain));
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assert(isIdhack(coveredExplain.queryPlanner.winningPlan), "G1");
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// Check doc from covered ID hack query.
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assert.eq({_id: {x: 2}}, t.findOne(query, {_id: 1}), "G2");
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//
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// Non-covered projection for idhack.
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//
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t.drop();
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t.insert({_id: 0, a: 0, b: [{c: 1}, {c: 2}]});
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t.insert({_id: 1, a: 1, b: [{c: 3}, {c: 4}]});
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// Simple inclusion.
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assert.eq({_id: 1, a: 1}, t.find({_id: 1}, {a: 1}).next());
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assert.eq({a: 1}, t.find({_id: 1}, {_id: 0, a: 1}).next());
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assert.eq({_id: 0, a: 0}, t.find({_id: 0}, {_id: 1, a: 1}).next());
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// Non-simple: exclusion.
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assert.eq({_id: 1, a: 1}, t.find({_id: 1}, {b: 0}).next());
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assert.eq({
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_id: 0,
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},
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t.find({_id: 0}, {a: 0, b: 0}).next());
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// Non-simple: dotted fields.
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assert.eq({b: [{c: 1}, {c: 2}]}, t.find({_id: 0}, {_id: 0, "b.c": 1}).next());
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assert.eq({_id: 1}, t.find({_id: 1}, {"foo.bar": 1}).next());
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// Non-simple: elemMatch projection.
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assert.eq({_id: 1, b: [{c: 4}]}, t.find({_id: 1}, {b: {$elemMatch: {c: 4}}}).next());
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// Non-simple: .returnKey().
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assert.eq({_id: 1}, t.find({_id: 1}).returnKey().next());
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// Non-simple: .returnKey() overrides other projections.
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assert.eq({_id: 1}, t.find({_id: 1}, {a: 1}).returnKey().next());
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