tdigest_column_view.hpp

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/*
 * Copyright (c) 2021-2024, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://apache.ac.cn/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#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