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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.
*/
#include "mongo/db/query/ce/hinted_estimator.h"
#include "mongo/db/query/ce/heuristic_estimator.h"
namespace mongo::optimizer::ce {
class HintedTransport {
public:
CEType transport(const ABT& n,
const SargableNode& node,
CEType childResult,
CEType /*bindsResult*/,
CEType /*refsResult*/) {
CEType result = childResult;
for (const auto& [key, req] : node.getReqMap()) {
if (!isIntervalReqFullyOpenDNF(req.getIntervals())) {
auto it = _hints.find(key);
if (it != _hints.cend()) {
// Assume independence.
result *= it->second;
}
}
}
return result;
}
template <typename T, typename... Ts>
CEType transport(const ABT& n, const T& /*node*/, Ts&&...) {
if (canBeLogicalNode<T>()) {
return _heuristicCE.deriveCE(_metadata, _memo, _logicalProps, n.ref());
}
return {0.0};
}
static CEType derive(const Metadata& metadata,
const cascades::Memo& memo,
const PartialSchemaSelHints& hints,
const properties::LogicalProps& logicalProps,
const ABT::reference_type logicalNodeRef) {
HintedTransport instance(metadata, memo, logicalProps, hints);
return algebra::transport<true>(logicalNodeRef, instance);
}
private:
HintedTransport(const Metadata& metadata,
const cascades::Memo& memo,
const properties::LogicalProps& logicalProps,
const PartialSchemaSelHints& hints)
: _heuristicCE(),
_metadata(metadata),
_memo(memo),
_logicalProps(logicalProps),
_hints(hints) {}
HeuristicEstimator _heuristicCE;
// We don't own this.
const Metadata& _metadata;
const cascades::Memo& _memo;
const properties::LogicalProps& _logicalProps;
const PartialSchemaSelHints& _hints;
};
CEType HintedEstimator::deriveCE(const Metadata& metadata,
const cascades::Memo& memo,
const properties::LogicalProps& logicalProps,
const ABT::reference_type logicalNodeRef) const {
return HintedTransport::derive(metadata, memo, _hints, logicalProps, logicalNodeRef);
}
} // namespace mongo::optimizer::ce
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