chunk.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/sys/rc.h"
#include "common/log/log.h"
#include "common/lang/memory.h"
#include "common/lang/vector.h"
#include "storage/common/column.h"
 
class Chunk
{
public:
  Chunk()              = default;
  Chunk(const Chunk &) = delete;
  Chunk(Chunk &&)      = delete;
 
  int column_num() const { return columns_.size(); }
 
  Column &column(size_t idx)
  {
    ASSERT(idx < columns_.size(), "invalid column index");
    return *columns_[idx];
  }
 
  Column *column_ptr(size_t idx)
  {
    ASSERT(idx < columns_.size(), "invalid column index");
    return &column(idx);
  }
 
  int column_ids(size_t i)
  {
    ASSERT(i < column_ids_.size(), "invalid column index");
    return column_ids_[i];
  }
 
  void add_column(unique_ptr<Column> col, int col_id);
 
  RC reference(Chunk &chunk);
 
  int rows() const;
 
  int capacity() const;
 
  Value get_value(int col_idx, int row_idx) const { return columns_[col_idx]->get_value(row_idx); }
 
  void reset_data();
 
  void reset();
 
private:
  vector<unique_ptr<Column>> columns_;
  // TODO: remove it and support multi-tables,
  // `columnd_ids` store the ids of child operator that need to be output
  vector<int> column_ids_;
};