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64 lines
2.3 KiB
JavaScript
64 lines
2.3 KiB
JavaScript
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/**
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* Test that queries containing $elemMatch correctly use an index if each child expression is
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* compatible with the index.
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*/
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(function() {
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"use strict";
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load("jstests/libs/analyze_plan.js");
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const coll = db.elemMatch_index;
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coll.drop();
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assert.writeOK(coll.insert({a: 1}));
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assert.writeOK(coll.insert({a: [{}]}));
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assert.writeOK(coll.insert({a: [1, null]}));
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assert.writeOK(coll.insert({a: [{type: "Point", coordinates: [0, 0]}]}));
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assert.commandWorked(coll.createIndex({a: 1}, {sparse: true}));
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function assertIndexResults(coll, query, useIndex, nReturned) {
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const explainPlan = coll.find(query).explain("executionStats");
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assert.eq(isIxscan(explainPlan.queryPlanner.winningPlan), useIndex);
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assert.eq(explainPlan.executionStats.nReturned, nReturned);
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}
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assertIndexResults(coll, {a: {$elemMatch: {$exists: false}}}, false, 0);
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// An $elemMatch predicate is treated as nested, and the index should be used for $exists:true.
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assertIndexResults(coll, {a: {$elemMatch: {$exists: true}}}, true, 3);
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// $not within $elemMatch should not attempt to use a sparse index for $exists:false.
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assertIndexResults(coll, {a: {$elemMatch: {$not: {$exists: false}}}}, false, 3);
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assertIndexResults(coll, {a: {$elemMatch: {$gt: 0, $not: {$exists: false}}}}, false, 1);
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// $geo within $elemMatch should not attempt to use a non-geo index.
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assertIndexResults(
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coll,
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{
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a: {
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$elemMatch: {
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$geoWithin: {
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$geometry:
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{type: "Polygon", coordinates: [[[0, 0], [0, 1], [1, 0], [0, 0]]]}
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}
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}
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}
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},
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false,
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1);
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// $in with a null value within $elemMatch should use a sparse index.
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assertIndexResults(coll, {a: {$elemMatch: {$in: [null]}}}, true, 1);
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// $eq with a null value within $elemMatch should use a sparse index.
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assertIndexResults(coll, {a: {$elemMatch: {$eq: null}}}, true, 1);
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// A negated regex within $elemMatch should not use an index, sparse or not.
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assertIndexResults(coll, {a: {$elemMatch: {$not: {$in: [/^a/]}}}}, false, 3);
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coll.dropIndexes();
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assert.commandWorked(coll.createIndex({a: 1}));
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assertIndexResults(coll, {a: {$elemMatch: {$not: {$in: [/^a/]}}}}, false, 3);
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})();
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