partitioning.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2020-2026, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
 
#pragma once
 
#include <cudf/hashing.hpp>
#include <cudf/utilities/default_stream.hpp>
#include <cudf/utilities/export.hpp>
#include <cudf/utilities/memory_resource.hpp>
 
#include <rmm/cuda_stream_view.hpp>
 
#include <memory>
#include <vector>
 
namespace CUDF_EXPORT cudf {
enum class hash_id : int32_t {
  HASH_IDENTITY = 0,  
  HASH_MURMUR3        
};
 
std::pair<std::unique_ptr<table>, std::vector<size_type>> partition(
  table_view const& t,
  column_view const& partition_map,
  size_type num_partitions,
  rmm::cuda_stream_view stream      = cudf::get_default_stream(),
  rmm::device_async_resource_ref mr = cudf::get_current_device_resource_ref());
 
std::pair<std::unique_ptr<table>, std::vector<size_type>> hash_partition(
  table_view const& input,
  std::vector<size_type> const& columns_to_hash,
  int num_partitions,
  hash_id hash_function             = hash_id::HASH_MURMUR3,
  uint32_t seed                     = DEFAULT_HASH_SEED,
  rmm::cuda_stream_view stream      = cudf::get_default_stream(),
  rmm::device_async_resource_ref mr = cudf::get_current_device_resource_ref());
 
std::pair<std::unique_ptr<table>, std::vector<size_type>> hash_partition(
  table_view const& input,
  table_view const& keys,
  int num_partitions,
  hash_id hash_function             = hash_id::HASH_MURMUR3,
  uint32_t seed                     = DEFAULT_HASH_SEED,
  rmm::cuda_stream_view stream      = cudf::get_default_stream(),
  rmm::device_async_resource_ref mr = cudf::get_current_device_resource_ref());
 
std::pair<std::unique_ptr<cudf::table>, std::vector<cudf::size_type>> round_robin_partition(
  table_view const& input,
  cudf::size_type num_partitions,
  cudf::size_type start_partition   = 0,
  rmm::cuda_stream_view stream      = cudf::get_default_stream(),
  rmm::device_async_resource_ref mr = cudf::get_current_device_resource_ref());
  // end of group
}  // namespace CUDF_EXPORT cudf