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/**
* Copyright (C) 2022-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.
*/
#pragma once
#include "mongo/db/query/optimizer/cascades/interfaces.h"
namespace mongo {
namespace optimizer {
namespace cascades {
// Forward declaration.
class CEInterface;
} // namespace cascades
} // namespace optimizer
namespace ce {
const double kMaxCEError = 0.01;
/**
* A helpful macro for asserting that the CE of a $match predicate is approximately what we were
* expecting.
*/
#define ASSERT_MATCH_CE(ce, predicate, expectedCE) \
ASSERT_APPROX_EQUAL(expectedCE, ce.getCE(predicate), kMaxCEError)
/**
* A test utility class for helping verify the cardinality of CE transports on a given $match
* predicate.
*/
class CETester {
public:
CETester(std::string collName, double numRecords);
/**
* Returns the estimated cardinality of a given 'matchPredicate'.
*/
double getCE(const std::string& matchPredicate);
protected:
/**
* Subclasses need to override this method to initialize the transports they are testing.
*/
virtual std::unique_ptr<optimizer::cascades::CEInterface> getCETransport(
OperationContext* opCtx) = 0;
std::string _collName;
// The number of records in the collection we are testing.
double _numRecords;
};
} // namespace ce
} // namespace mongo
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