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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/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 Node;
using NodePtr = std::unique_ptr<Node>;
class AbstractVisitor;
class Node {
public:
using ChildVector = std::vector<NodePtr>;
protected:
explicit Node(Context& ctx);
explicit Node(Context& ctx, NodePtr child);
explicit Node(Context& ctx, ChildVector children);
void generateMemoBase(std::ostringstream& os) const;
virtual void visit(AbstractVisitor& visitor) const = 0;
void visitPreOrder(AbstractVisitor& visitor) const;
void visitPostOrder(AbstractVisitor& visitor) const;
// clone
public:
Node() = delete;
std::string generateMemo() const;
NodePtr clone(Context& ctx) const;
int getChildCount() const;
private:
const NodeIdType _nodeId;
ChildVector _children;
};
class ScanNode : public Node {
public:
static NodePtr create(Context& ctx, CollectionNameType collectionName);
static NodePtr clone(Context& ctx, const ScanNode& other);
void generateMemo(std::ostringstream& os) const;
protected:
void visit(AbstractVisitor& visitor) const override;
private:
explicit ScanNode(Context& ctx, CollectionNameType collectionName);
const CollectionNameType _collectionName;
};
class MultiJoinNode : public Node {
public:
using FilterSet = std::unordered_set<FilterType>;
using ProjectionMap = std::unordered_map<ProjectionName, ProjectionType>;
static NodePtr create(Context& ctx,
FilterSet filterSet,
ProjectionMap projectionMap,
ChildVector children);
static NodePtr clone(Context& ctx, const MultiJoinNode& other, ChildVector newChildren);
void generateMemo(std::ostringstream& os) const;
protected:
void visit(AbstractVisitor& visitor) const override;
private:
explicit MultiJoinNode(Context& ctx,
FilterSet filterSet,
ProjectionMap projectionMap,
ChildVector children);
FilterSet _filterSet;
ProjectionMap _projectionMap;
};
class UnionNode : public Node {
public:
static NodePtr create(Context& ctx, ChildVector children);
static NodePtr clone(Context& ctx, const UnionNode& other, ChildVector newChildren);
void generateMemo(std::ostringstream& os) const;
protected:
void visit(AbstractVisitor& visitor) const override;
private:
explicit UnionNode(Context& ctx, ChildVector children);
};
class GroupByNode : public Node {
public:
using GroupByVector = std::vector<ProjectionName>;
using ProjectionMap = std::unordered_map<ProjectionName, ProjectionType>;
static NodePtr create(Context& ctx,
GroupByVector groupByVector,
ProjectionMap projectionMap,
NodePtr child);
static NodePtr clone(Context& ctx, const GroupByNode& other, NodePtr newChild);
void generateMemo(std::ostringstream& os) const;
protected:
void visit(AbstractVisitor& visitor) const override;
private:
explicit GroupByNode(Context& ctx,
GroupByVector groupByVector,
ProjectionMap projectionMap,
NodePtr child);
GroupByVector _groupByVector;
ProjectionMap _projectionMap;
};
class UnwindNode : public Node {
public:
static NodePtr create(Context& ctx,
ProjectionName projectionName,
bool retainNonArrays,
NodePtr child);
static NodePtr clone(Context& ctx, const UnwindNode& other, NodePtr newChild);
void generateMemo(std::ostringstream& os) const;
protected:
void visit(AbstractVisitor& visitor) const override;
private:
UnwindNode(Context& ctx, ProjectionName projectionName, bool retainNonArrays, NodePtr child);
const ProjectionName _projectionName;
const bool _retainNonArrays;
};
class WindNode : public Node {
public:
static NodePtr create(Context& ctx, ProjectionName projectionName, NodePtr child);
static NodePtr clone(Context& ctx, const WindNode& other, NodePtr newChild);
void generateMemo(std::ostringstream& os) const;
protected:
void visit(AbstractVisitor& visitor) const override;
private:
WindNode(Context& ctx, ProjectionName projectionName, NodePtr child);
const ProjectionName _projectionName;
};
} // namespace mongo::optimizer
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