table_get_logical_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.
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. */
 
//
// Created by Wangyunlai on 2022/12/07.
//
#pragma once
 
#include "sql/operator/logical_operator.h"
#include "storage/field/field.h"
#include "common/types.h"
 
class TableGetLogicalOperator : public LogicalOperator
{
public:
  TableGetLogicalOperator(Table *table, ReadWriteMode mode);
  virtual ~TableGetLogicalOperator() = default;
 
  LogicalOperatorType type() const override { return LogicalOperatorType::TABLE_GET; }
 
  OpType get_op_type() const override { return OpType::LOGICALGET; }
 
  virtual uint64_t hash() const override { return 0; }
 
  virtual bool operator==(const OperatorNode &other) const override { return false; }
 
  unique_ptr<LogicalProperty> find_log_prop(const vector<LogicalProperty *> &log_props) override;
 
  Table        *table() const { return table_; }
  ReadWriteMode read_write_mode() const { return mode_; }
 
  void set_predicates(vector<unique_ptr<Expression>> &&exprs);
  auto predicates() -> vector<unique_ptr<Expression>> & { return predicates_; }
 
private:
  Table        *table_ = nullptr;
  ReadWriteMode mode_  = ReadWriteMode::READ_WRITE;
 
  // 与当前表相关的过滤操作，可以尝试在遍历数据时执行
  // 这里的表达式都是比较简单的比较运算，并且左右两边都是取字段表达式或值表达式
  // 不包含复杂的表达式运算，比如加减乘除、或者conjunction expression
  // 如果有多个表达式，他们的关系都是 AND
  vector<unique_ptr<Expression>> predicates_;
};