explain_physical_operator.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.
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THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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See the Mulan PSL v2 for more details. */
 
//
// Created by WangYunlai on 2022/12/27.
//
 
#pragma once
 
#include "sql/operator/physical_operator.h"
 
class ExplainPhysicalOperator : public PhysicalOperator
{
public:
  ExplainPhysicalOperator() = default;
  virtual ~ExplainPhysicalOperator() = default;
 
  PhysicalOperatorType type() const override
  {
    return PhysicalOperatorType::EXPLAIN;
  }
 
  RC open(Trx *trx) override;
  RC next() override;
  RC close() override;
  Tuple *current_tuple() override;
 
private:
  void to_string(std::ostream &os, PhysicalOperator *oper, int level, bool last_child, std::vector<bool> &ends);
 
private:
  std::string physical_plan_;
  ValueListTuple tuple_;
};