group.h

/* Copyright (c) 2021 OceanBase and/or its affiliates. All rights reserved.
miniob is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:
         http://license.coscl.org.cn/MulanPSL2
THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details. */
 
#pragma once
 
#include "common/lang/limits.h"
#include "common/lang/vector.h"
#include "common/lang/unordered_set.h"
#include "common/lang/memory.h"
#include "common/log/log.h"
#include "common/lang/unordered_map.h"
#include "sql/optimizer/cascade/property_set.h"
 
class GroupExpr;
class Memo;
class Group
{
public:
  Group(int id, GroupExpr *expr, Memo *memo);
 
  ~Group();
 
  void add_expr(GroupExpr *expr);
 
  bool set_expr_cost(GroupExpr *expr, double cost);
 
  GroupExpr *get_winner();
 
  const std::vector<GroupExpr *> &get_logical_expressions() const { return logical_expressions_; }
 
  const std::vector<GroupExpr *> &get_physical_expressions() const { return physical_expressions_; }
 
  double get_cost_lb() { return -1; }
 
  void set_explored() { has_explored_ = true; }
 
  bool has_explored() { return has_explored_; }
 
  int get_id() const { return id_; }
 
  GroupExpr *get_logical_expression();
 
  LogicalProperty *get_logical_prop() { return logical_prop_.get(); }
 
  void dump() const;
 
private:
  int id_;
 
  std::tuple<double, GroupExpr *> winner_;
 
  bool has_explored_;
 
  std::vector<GroupExpr *> logical_expressions_;
 
  std::vector<GroupExpr *> physical_expressions_;
 
  unique_ptr<LogicalProperty> logical_prop_ = nullptr;
};