contiguous_split.hpp

Go to the documentation of this file.

/*
 * SPDX-FileCopyrightText: Copyright (c) 2023-2025, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
 
#pragma once
 
#include <cudf/packed_types.hpp>
#include <cudf/types.hpp>
#include <cudf/utilities/export.hpp>
#include <cudf/utilities/memory_resource.hpp>
 
#include <memory>
#include <vector>
 
namespace CUDF_EXPORT cudf {
 
std::vector<packed_table> contiguous_split(
  cudf::table_view const& input,
  std::vector<size_type> const& splits,
  rmm::cuda_stream_view stream      = cudf::get_default_stream(),
  rmm::device_async_resource_ref mr = cudf::get_current_device_resource_ref());
 
namespace detail {
 
struct contiguous_split_state;
}  // namespace detail
 
class chunked_pack {
 public:
  explicit chunked_pack(
    cudf::table_view const& input,
    std::size_t user_buffer_size,
    rmm::cuda_stream_view stream           = cudf::get_default_stream(),
    rmm::device_async_resource_ref temp_mr = cudf::get_current_device_resource_ref());
 
  ~chunked_pack();
 
  [[nodiscard]] std::size_t get_total_contiguous_size() const;
 
  [[nodiscard]] bool has_next() const;
 
  [[nodiscard]] std::size_t next(cudf::device_span<uint8_t> const& user_buffer);
 
  [[nodiscard]] std::unique_ptr<std::vector<uint8_t>> build_metadata() const;
 
  [[nodiscard]] static std::unique_ptr<chunked_pack> create(
    cudf::table_view const& input,
    std::size_t user_buffer_size,
    rmm::cuda_stream_view stream           = cudf::get_default_stream(),
    rmm::device_async_resource_ref temp_mr = cudf::get_current_device_resource_ref());
 
 private:
  // internal state of contiguous split
  std::unique_ptr<detail::contiguous_split_state> state;
};
 
packed_columns pack(cudf::table_view const& input,
                    rmm::cuda_stream_view stream      = cudf::get_default_stream(),
                    rmm::device_async_resource_ref mr = cudf::get_current_device_resource_ref());
 
std::vector<uint8_t> pack_metadata(table_view const& table,
                                   uint8_t const* contiguous_buffer,
                                   size_t buffer_size);
 
table_view unpack(packed_columns const& input);
 
table_view unpack(uint8_t const* metadata, uint8_t const* gpu_data);
 
}  // namespace CUDF_EXPORT cudf