tdigest_column_view.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2021-2024, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <cudf/column/column_view.hpp>
#include <cudf/lists/lists_column_view.hpp>
 
namespace CUDF_EXPORT cudf {
namespace tdigest {
class tdigest_column_view : private column_view {
 public:
  tdigest_column_view(column_view const&);  
  tdigest_column_view(tdigest_column_view&&)      = default;  
  tdigest_column_view(tdigest_column_view const&) = default;  
  ~tdigest_column_view() override                 = default;
  tdigest_column_view& operator=(tdigest_column_view const&) = default;
  tdigest_column_view& operator=(tdigest_column_view&&) = default;
 
  using column_view::size;
  using offset_iterator = size_type const*;  
 
  // mean and weight column indices within tdigest inner struct columns
  static constexpr size_type mean_column_index{0};    
  static constexpr size_type weight_column_index{1};  
 
  // min and max column indices within tdigest outer struct columns
  static constexpr size_type centroid_column_index{0};  
  static constexpr size_type min_column_index{1};       
  static constexpr size_type max_column_index{2};       
 
  [[nodiscard]] column_view parent() const;
 
  [[nodiscard]] lists_column_view centroids() const;
 
  [[nodiscard]] column_view means() const;
 
  [[nodiscard]] column_view weights() const;
 
  [[nodiscard]] double const* min_begin() const;
 
  [[nodiscard]] double const* max_begin() const;
};
  // end of group
}  // namespace tdigest
}  // namespace CUDF_EXPORT cudf