mirror of https://github.com/mongodb/mongo
96 lines
5.0 KiB
JavaScript
96 lines
5.0 KiB
JavaScript
// Failing due to queries on a sharded collection not able to be covered when they aren't on the
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// shard key since the document needs to be fetched in order to apply the SHARDING_FILTER stage.
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// @tags: [assumes_unsharded_collection]
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/**
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* Test projections with dotted field paths. Also test that such projections result in covered plans
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* when appropriate.
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*/
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(function() {
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"use strict";
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load("jstests/libs/analyze_plan.js");
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let coll = db["projection_dotted_paths"];
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coll.drop();
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assert.commandWorked(coll.createIndex({a: 1, "b.c": 1, "b.d": 1, c: 1}));
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assert.commandWorked(coll.insert({_id: 1, a: 1, b: {c: 1, d: 1, e: 1}, c: 1, e: 1}));
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// Project exactly the set of fields in the index. Verify that the projection is computed
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// correctly and that the plan is covered.
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let resultDoc = coll.findOne({a: 1}, {_id: 0, a: 1, "b.c": 1, "b.d": 1, c: 1});
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assert.eq(resultDoc, {a: 1, b: {c: 1, d: 1}, c: 1});
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let explain = coll.find({a: 1}, {_id: 0, a: 1, "b.c": 1, "b.d": 1, c: 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
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// Project a subset of the indexed fields. Verify that the projection is computed correctly and
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// that the plan is covered.
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resultDoc = coll.findOne({a: 1}, {_id: 0, "b.c": 1, c: 1});
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assert.eq(resultDoc, {b: {c: 1}, c: 1});
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explain = coll.find({a: 1}, {_id: 0, "b.c": 1, c: 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
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// Project exactly the set of fields in the index but also include _id. Verify that the
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// projection is computed correctly and that the plan cannot be covered.
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resultDoc = coll.findOne({a: 1}, {_id: 1, a: 1, "b.c": 1, "b.d": 1, c: 1});
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assert.eq(resultDoc, {_id: 1, a: 1, b: {c: 1, d: 1}, c: 1});
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explain = coll.find({a: 1}, {_id: 0, "b.c": 1, c: 1}).explain("queryPlanner");
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explain = coll.find({a: 1}, {_id: 1, a: 1, "b.c": 1, "b.d": 1, c: 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(!isIndexOnly(db, explain.queryPlanner.winningPlan));
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// Project a not-indexed field that exists in the collection. The plan should not be covered.
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resultDoc = coll.findOne({a: 1}, {_id: 0, "b.c": 1, "b.e": 1, c: 1});
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assert.eq(resultDoc, {b: {c: 1, e: 1}, c: 1});
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explain = coll.find({a: 1}, {_id: 0, "b.c": 1, "b.e": 1, c: 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(!isIndexOnly(db, explain.queryPlanner.winningPlan));
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// Project a not-indexed field that does not exist in the collection. The plan should not be
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// covered.
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resultDoc = coll.findOne({a: 1}, {_id: 0, "b.c": 1, "b.z": 1, c: 1});
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assert.eq(resultDoc, {b: {c: 1}, c: 1});
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explain = coll.find({a: 1}, {_id: 0, "b.c": 1, "b.z": 1, c: 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(!isIndexOnly(db, explain.queryPlanner.winningPlan));
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// Verify that the correct projection is computed with an idhack query.
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resultDoc = coll.findOne({_id: 1}, {_id: 0, "b.c": 1, "b.e": 1, c: 1});
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assert.eq(resultDoc, {b: {c: 1, e: 1}, c: 1});
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explain = coll.find({_id: 1}, {_id: 0, "b.c": 1, "b.e": 1, c: 1}).explain("queryPlanner");
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assert(isIdhack(db, explain.queryPlanner.winningPlan));
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// If we make a dotted path multikey, projections using that path cannot be covered. But
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// projections which do not include the multikey path can still be covered.
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assert.commandWorked(coll.insert({a: 2, b: {c: 1, d: [1, 2, 3]}}));
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resultDoc = coll.findOne({a: 2}, {_id: 0, "b.c": 1, "b.d": 1});
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assert.eq(resultDoc, {b: {c: 1, d: [1, 2, 3]}});
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explain = coll.find({a: 2}, {_id: 0, "b.c": 1, "b.d": 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(!isIndexOnly(db, explain.queryPlanner.winningPlan));
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resultDoc = coll.findOne({a: 2}, {_id: 0, "b.c": 1});
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assert.eq(resultDoc, {b: {c: 1}});
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explain = coll.find({a: 2}, {_id: 0, "b.c": 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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// Path-level multikey info allows for generating a covered plan.
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assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
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// Verify that dotted projections work for multiple levels of nesting.
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assert.commandWorked(coll.createIndex({a: 1, "x.y.y": 1, "x.y.z": 1, "x.z": 1}));
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assert.commandWorked(coll.insert({a: 3, x: {y: {y: 1, f: 1, z: 1}, f: 1, z: 1}}));
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resultDoc = coll.findOne({a: 3}, {_id: 0, "x.y.y": 1, "x.y.z": 1, "x.z": 1});
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assert.eq(resultDoc, {x: {y: {y: 1, z: 1}, z: 1}});
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explain = coll.find({a: 3}, {_id: 0, "x.y.y": 1, "x.y.z": 1, "x.z": 1}).explain("queryPlanner");
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assert(isIxscan(db, explain.queryPlanner.winningPlan));
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assert(isIndexOnly(db, explain.queryPlanner.winningPlan));
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// If projected nested paths do not exist in the indexed document, then they will get filled in
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// with nulls. This is a bug tracked by SERVER-23229.
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resultDoc = coll.findOne({a: 1}, {_id: 0, "x.y.y": 1, "x.y.z": 1, "x.z": 1});
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assert.eq(resultDoc, {x: {y: {y: null, z: null}, z: null}});
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}());
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