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/**
* Matching behavior for $elemMatch applied to a top level element.
* Includes tests for bugs described in SERVER-1264 and SERVER-4180.
*/
(function() {
"use strict";
const coll = db.jstests_arrayfind8;
coll.drop();
// May be changed during the test.
let currentIndexSpec = {a: 1};
/**
* Check that the query results match the documents in the 'expected' array.
*/
function assertResults(expected, query, context) {
assert.eq(expected.length, coll.count(query), 'unexpected count in ' + context);
const results = coll.find(query).toArray();
const resultsAOnly = results.map((r) => r.a);
assert.sameMembers(resultsAOnly, expected);
}
/**
* Check matching for different query types.
* @param bothMatch - document matched by both standardQuery and elemMatchQuery
* @param elemMatch - document matched by elemMatchQuery but not standardQuery
* @param notElemMatch - document matched by standardQuery but not elemMatchQuery
*/
function checkMatch(bothMatch, elemMatch, nonElemMatch, standardQuery, elemMatchQuery, context) {
function mayPush(arr, elt) {
if (elt) {
arr.push(elt);
}
}
let expectedStandardQueryResults = [];
mayPush(expectedStandardQueryResults, bothMatch);
mayPush(expectedStandardQueryResults, nonElemMatch);
assertResults(expectedStandardQueryResults, standardQuery, context + ' standard query');
let expectedElemMatchQueryResults = [];
mayPush(expectedElemMatchQueryResults, bothMatch);
mayPush(expectedElemMatchQueryResults, elemMatch);
assertResults(expectedElemMatchQueryResults, elemMatchQuery, context + ' elemMatch query');
}
/**
* Check matching and for different query types.
* @param subQuery - part of a query, to be provided as is for a standard query and within a
* $elemMatch clause for a $elemMatch query
* @param bothMatch - document matched by both standardQuery and elemMatchQuery
* @param elemMatch - document matched by elemMatchQuery but not standardQuery
* @param notElemMatch - document matched by standardQuery but not elemMatchQuery
* @param additionalConstraints - additional query parameters not generated from @param subQuery
*/
function checkQuery(subQuery, bothMatch, elemMatch, nonElemMatch, additionalConstraints) {
coll.drop();
additionalConstraints = additionalConstraints || {};
// Construct standard and elemMatch queries from subQuery.
const firstSubQueryKey = Object.keySet(subQuery)[0];
let standardQuery = null;
if (firstSubQueryKey[0] == '$') {
standardQuery = {$and: [{a: subQuery}, additionalConstraints]};
} else {
// If the subQuery contains a field rather than operators, append to the 'a' field.
let modifiedSubQuery = {};
modifiedSubQuery['a.' + firstSubQueryKey] = subQuery[firstSubQueryKey];
standardQuery = {$and: [modifiedSubQuery, additionalConstraints]};
}
const elemMatchQuery = {$and: [{a: {$elemMatch: subQuery}}, additionalConstraints]};
function insertValueIfNotNull(val) {
if (val) {
assert.commandWorked(coll.insert({a: val}));
}
}
// Save all documents and check matching without indexes.
insertValueIfNotNull(bothMatch);
insertValueIfNotNull(elemMatch);
insertValueIfNotNull(nonElemMatch);
checkMatch(bothMatch, elemMatch, nonElemMatch, standardQuery, elemMatchQuery, 'unindexed');
// Check matching and index bounds for a single key index.
assert.eq(coll.drop(), true);
insertValueIfNotNull(bothMatch);
insertValueIfNotNull(elemMatch);
// The nonElemMatch document is not tested here, as it will often make the index multikey.
assert.commandWorked(coll.createIndex(currentIndexSpec));
checkMatch(bothMatch, elemMatch, null, standardQuery, elemMatchQuery, 'single key index');
// Check matching and index bounds for a multikey index.
// Now the nonElemMatch document is tested.
insertValueIfNotNull(nonElemMatch);
// Force the index to be multikey.
assert.commandWorked(coll.insert({a: [-1, -2]}));
assert.commandWorked(coll.insert({a: {b: [-1, -2]}}));
checkMatch(bothMatch, elemMatch, nonElemMatch, standardQuery, elemMatchQuery, 'multikey index');
}
// Basic test.
checkQuery({$gt: 4}, [5]);
// Multiple constraints within a $elemMatch clause.
checkQuery({$gt: 4, $lt: 6}, [5], null, [3, 7]);
checkQuery({$gt: 4, $not: {$gte: 6}}, [5]);
checkQuery({$gt: 4, $not: {$ne: 6}}, [6]);
checkQuery({$gte: 5, $lte: 5}, [5], null, [4, 6]);
checkQuery({$in: [4, 6], $gt: 5}, [6], null, [4, 7]);
checkQuery({$regex: '^a'}, ['a']);
// Some constraints within a $elemMatch clause and other constraints outside of it.
checkQuery({$gt: 4}, [5], null, null, {a: {$lt: 6}});
checkQuery({$gte: 5}, [5], null, null, {a: {$lte: 5}});
checkQuery({$in: [4, 6]}, [6], null, null, {a: {$gt: 5}});
// Constraints in different $elemMatch clauses.
checkQuery({$gt: 4}, [5], null, null, {a: {$elemMatch: {$lt: 6}}});
checkQuery({$gt: 4}, [3, 7], null, null, {a: {$elemMatch: {$lt: 6}}});
checkQuery({$gte: 5}, [5], null, null, {a: {$elemMatch: {$lte: 5}}});
checkQuery({$in: [4, 6]}, [6], null, null, {a: {$elemMatch: {$gt: 5}}});
checkQuery({$elemMatch: {$in: [5]}}, null, [[5]], [5], null);
currentIndexSpec = {
"a.b": 1
};
checkQuery({$elemMatch: {b: {$gte: 1, $lte: 1}}}, null, [[{b: 1}]], [{b: 1}], null);
checkQuery({$elemMatch: {b: {$gte: 1, $lte: 1}}}, null, [[{b: [0, 2]}]], [{b: [0, 2]}], null);
// Constraints for a top level (SERVER-1264 style) $elemMatch nested within a non top level
// $elemMatch.
checkQuery({b: {$elemMatch: {$gte: 1, $lte: 1}}}, [{b: [1]}]);
checkQuery({b: {$elemMatch: {$gte: 1, $lte: 4}}}, [{b: [1]}]);
checkQuery({b: {$elemMatch: {$gte: 1, $lte: 4}}}, [{b: [2]}], null, null, {'a.b': {$in: [2, 5]}});
checkQuery(
{b: {$elemMatch: {$in: [1, 2]}, $in: [2, 3]}}, [{b: [2]}], null, [{b: [1]}, {b: [3]}], null);
})();
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