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/**
* Copyright (C) 2020-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/exec/trial_period_utils.h"
#include "mongo/db/catalog/collection.h"
namespace mongo::trial_period {
size_t getTrialPeriodMaxWorks(OperationContext* opCtx, const CollectionPtr& collection) {
// Run each plan some number of times. This number is at least as great as
// 'internalQueryPlanEvaluationWorks', but may be larger for big collections.
size_t numWorks = internalQueryPlanEvaluationWorks.load();
if (collection) {
// For large collections, the number of works is set to be this fraction of the collection
// size.
double fraction = internalQueryPlanEvaluationCollFraction;
numWorks = std::max(static_cast<size_t>(internalQueryPlanEvaluationWorks.load()),
static_cast<size_t>(fraction * collection->numRecords(opCtx)));
}
return numWorks;
}
size_t getTrialPeriodNumToReturn(const CanonicalQuery& query) {
// Determine the number of results which we will produce during the plan ranking phase before
// stopping.
size_t numResults = static_cast<size_t>(internalQueryPlanEvaluationMaxResults.load());
if (query.getFindCommandRequest().getNtoreturn()) {
numResults = std::min(static_cast<size_t>(*query.getFindCommandRequest().getNtoreturn()),
numResults);
} else if (query.getFindCommandRequest().getLimit()) {
numResults =
std::min(static_cast<size_t>(*query.getFindCommandRequest().getLimit()), numResults);
}
return numResults;
}
} // namespace mongo::trial_period
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