scalar_group_by_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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See the Mulan PSL v2 for more details. */
 
//
// Created by WangYunlai on 2024/06/11.
//
 
#pragma once
 
#include "sql/operator/group_by_physical_operator.h"
 
class ScalarGroupByPhysicalOperator : public GroupByPhysicalOperator
{
public:
  ScalarGroupByPhysicalOperator(vector<Expression *> &&expressions);
  virtual ~ScalarGroupByPhysicalOperator() = default;
 
  PhysicalOperatorType type() const override { return PhysicalOperatorType::SCALAR_GROUP_BY; }
  OpType               get_op_type() const override { return OpType::SCALARGROUPBY; }
 
  RC open(Trx *trx) override;
  RC next() override;
  RC close() override;
 
  Tuple *current_tuple() override;
 
private:
  unique_ptr<GroupValueType> group_value_;
  bool                       emitted_ = false;  
};