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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.
*/
#pragma once
#include <memory>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "mongo/db/query/optimizer/algebra/operator.h"
#include "mongo/db/query/optimizer/defs.h"
#include "mongo/db/query/optimizer/filter.h"
#include "mongo/db/query/optimizer/projection.h"
#include "mongo/db/query/optimizer/props.h"
namespace mongo::optimizer {
class ScanNode;
class MultiJoinNode;
class UnionNode;
class GroupByNode;
class UnwindNode;
class WindNode;
using PolymorphicNode =
algebra::PolyValue<ScanNode, MultiJoinNode, UnionNode, GroupByNode, UnwindNode, WindNode>;
template <typename Derived, size_t Arity>
using Operator = algebra::OpSpecificArity<PolymorphicNode, Derived, Arity>;
template <typename Derived, size_t Arity>
using OperatorDynamic = algebra::OpSpecificDynamicArity<PolymorphicNode, Derived, Arity>;
template <typename Derived>
using OperatorDynamicHomogenous = OperatorDynamic<Derived, 0>;
using PolymorphicNodeVector = std::vector<PolymorphicNode>;
template <typename T, typename... Args>
inline auto make(Args&&... args) {
return PolymorphicNode::make<T>(std::forward<Args>(args)...);
}
template <typename... Args>
inline auto makeSeq(Args&&... args) {
PolymorphicNodeVector seq;
(seq.emplace_back(std::forward<Args>(args)), ...);
return seq;
}
class Node {
protected:
explicit Node(Context& ctx);
void generateMemoBase(std::ostringstream& os) const;
public:
Node() = delete;
private:
const NodeIdType _nodeId;
};
class ScanNode final : public Operator<ScanNode, 0>, public Node {
using Base = Operator<ScanNode, 0>;
public:
explicit ScanNode(Context& ctx, CollectionNameType collectionName);
void generateMemo(std::ostringstream& os) const;
private:
const CollectionNameType _collectionName;
};
class MultiJoinNode final : public OperatorDynamicHomogenous<MultiJoinNode>, public Node {
using Base = OperatorDynamicHomogenous<MultiJoinNode>;
public:
using FilterSet = std::unordered_set<FilterType>;
using ProjectionMap = std::unordered_map<ProjectionName, ProjectionType>;
explicit MultiJoinNode(Context& ctx,
FilterSet filterSet,
ProjectionMap projectionMap,
PolymorphicNodeVector children);
void generateMemo(std::ostringstream& os) const;
private:
FilterSet _filterSet;
ProjectionMap _projectionMap;
};
class UnionNode final : public OperatorDynamicHomogenous<UnionNode>, public Node {
using Base = OperatorDynamicHomogenous<UnionNode>;
public:
explicit UnionNode(Context& ctx, PolymorphicNodeVector children);
void generateMemo(std::ostringstream& os) const;
};
class GroupByNode : public Operator<GroupByNode, 1>, public Node {
using Base = Operator<GroupByNode, 1>;
public:
using GroupByVector = std::vector<ProjectionName>;
using ProjectionMap = std::unordered_map<ProjectionName, ProjectionType>;
explicit GroupByNode(Context& ctx,
GroupByVector groupByVector,
ProjectionMap projectionMap,
PolymorphicNode child);
void generateMemo(std::ostringstream& os) const;
private:
GroupByVector _groupByVector;
ProjectionMap _projectionMap;
};
class UnwindNode final : public Operator<UnwindNode, 1>, public Node {
using Base = Operator<UnwindNode, 1>;
public:
explicit UnwindNode(Context& ctx,
ProjectionName projectionName,
bool retainNonArrays,
PolymorphicNode child);
void generateMemo(std::ostringstream& os) const;
private:
const ProjectionName _projectionName;
const bool _retainNonArrays;
};
class WindNode final : public Operator<WindNode, 1>, public Node {
using Base = Operator<WindNode, 1>;
public:
explicit WindNode(Context& ctx, ProjectionName projectionName, PolymorphicNode child);
void generateMemo(std::ostringstream& os) const;
private:
const ProjectionName _projectionName;
};
} // namespace mongo::optimizer
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