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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/matcher/matcher.h"
#include "mongo/db/pipeline/expression_context_for_test.h"
#include "mongo/db/query/index_tag.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
BSONObj serializeMatcher(Matcher* matcher) {
BSONObjBuilder builder;
matcher->getMatchExpression()->serialize(&builder);
return builder.obj();
}
TEST(PlannerAccessTest, PrepareForAccessPlanningSortsEqualNodesByTheirChildren) {
boost::intrusive_ptr<ExpressionContext> expCtx{new ExpressionContextForTest()};
Matcher matcher{fromjson("{$or: [{x: 1, b: 1}, {y: 1, a: 1}]}"), expCtx};
// Before sorting for access planning, the order of the tree should be as specified in the
// original input BSON.
ASSERT_BSONOBJ_EQ(serializeMatcher(&matcher),
fromjson("{$or: [{$and: [{x: {$eq: 1}}, {b: {$eq: 1}}]},"
"{$and: [{y: {$eq: 1}}, {a: {$eq: 1}}]}]}"));
// The two $or nodes in the match expression tree are only differentiated by their children.
// After sorting in the order expected by the access planner, the $or node with the "a" child
// should come first.
prepareForAccessPlanning(matcher.getMatchExpression());
ASSERT_BSONOBJ_EQ(serializeMatcher(&matcher),
fromjson("{$or: [{$and: [{a: {$eq: 1}}, {y: {$eq: 1}}]},"
"{$and: [{b: {$eq: 1}}, {x: {$eq: 1}}]}]}"));
}
TEST(PlannerAccessTest, PrepareForAccessPlanningSortsByNumberOfChildren) {
boost::intrusive_ptr<ExpressionContext> expCtx{new ExpressionContextForTest()};
Matcher matcher{fromjson("{$or: [{a: 1, c: 1, b: 1}, {b: 1, a: 1}]}"), expCtx};
// Before sorting for access planning, the order of the tree should be as specified in the
// original input BSON.
ASSERT_BSONOBJ_EQ(serializeMatcher(&matcher),
fromjson("{$or: [{$and: [{a: {$eq: 1}}, {c: {$eq: 1}}, {b: {$eq: 1}}]},"
"{$and: [{b: {$eq: 1}}, {a: {$eq: 1}}]}]}"));
// The two $or nodes in the match expression tree are only differentiated by the number of
// children they have. Both have {a: {$eq: 1}} and {b: {$eq: 1}} as their first children, but
// one has an additional child. The node with fewer children should be sorted first.
prepareForAccessPlanning(matcher.getMatchExpression());
ASSERT_BSONOBJ_EQ(serializeMatcher(&matcher),
fromjson("{$or: [{$and: [{a: {$eq: 1}}, {b: {$eq: 1}}]},"
"{$and: [{a: {$eq: 1}}, {b: {$eq: 1}}, {c: {$eq: 1}}]}]}"));
}
TEST(PlannerAccessTest, PrepareForAccessPlanningSortIsStable) {
boost::intrusive_ptr<ExpressionContext> expCtx{new ExpressionContextForTest()};
Matcher matcher{fromjson("{$or: [{a: 2, b: 2}, {a: 1, b: 1}]}"), expCtx};
BSONObj expectedSerialization = fromjson(
"{$or: [{$and: [{a: {$eq: 2}}, {b: {$eq: 2}}]},"
"{$and: [{a: {$eq: 1}}, {b: {$eq: 1}}]}]}");
// Before sorting for access planning, the order of the tree should be as specified in the
// original input BSON.
ASSERT_BSONOBJ_EQ(serializeMatcher(&matcher), expectedSerialization);
// Sorting for access planning should not change the order of the match expression tree. The two
// $or branches are considered equal, since they only differ by their constants.
prepareForAccessPlanning(matcher.getMatchExpression());
ASSERT_BSONOBJ_EQ(serializeMatcher(&matcher), expectedSerialization);
}
} // namespace
} // namespace mongo
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