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json_gpu.h
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json_gpu.h
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/*
* Copyright (c) 2020-2021, 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
*
* http://www.apache.org/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 <io/utilities/column_type_histogram.hpp>
#include <io/utilities/parsing_utils.cuh>
#include <hash/concurrent_unordered_map.cuh>
#include <cudf/table/table_device_view.cuh>
#include <cudf/types.hpp>
#include <cudf/utilities/span.hpp>
#include <rmm/cuda_stream_view.hpp>
#include <thrust/optional.h>
using cudf::device_span;
namespace cudf {
namespace io {
namespace json {
namespace gpu {
using col_map_type = concurrent_unordered_map<uint32_t, cudf::size_type>;
/**
* @brief Convert a buffer of input data (text) into raw cuDF column data.
*
* @param[in] options A set of parsing options
* @param[in] data The entire data to read
* @param[in] row_offsets The start of each data record
* @param[in] dtypes The data type of each column
* @param[in] col_map Pointer to the (column name hash -> column index) map in device memory.
* nullptr is passed when the input file does not consist of objects.
* @param[out] output_columns The output column data
* @param[out] valid_fields The bitmaps indicating whether column fields are valid
* @param[out] num_valid_fields The numbers of valid fields in columns
* @param[in] stream CUDA stream used for device memory operations and kernel launches.
*/
void convert_json_to_columns(parse_options_view const& options,
device_span<char const> data,
device_span<uint64_t const> row_offsets,
device_span<data_type const> column_types,
col_map_type* col_map,
device_span<void* const> output_columns,
device_span<bitmask_type* const> valid_fields,
device_span<cudf::size_type> num_valid_fields,
rmm::cuda_stream_view stream);
/**
* @brief Process a buffer of data and determine information about the column types within.
*
* @param[in] options A set of parsing options
* @param[in] data Input data buffer
* @param[in] row_offsets The offset of each row in the input
* @param[in] num_columns The number of columns of input data
* @param[in] col_map Pointer to the (column name hash -> column index) map in device memory.
* nullptr is passed when the input file does not consist of objects.
* @param[in] stream CUDA stream used for device memory operations and kernel launches.
*
* @returns The count for each column data type
*/
std::vector<cudf::io::column_type_histogram> detect_data_types(
parse_options_view const& options,
device_span<char const> data,
device_span<uint64_t const> row_offsets,
bool do_set_null_count,
int num_columns,
col_map_type* col_map,
rmm::cuda_stream_view stream);
/**
* @brief Collects information about JSON object keys in the file.
*
* @param[in] options A set of parsing options
* @param[in] data Input data buffer
* @param[in] row_offsets The offset of each row in the input
* @param[out] keys_cnt Number of keys found in the file
* @param[out] keys_info optional, information (offset, length, hash) for each found key
* @param[in] stream CUDA stream used for device memory operations and kernel launches.
*/
void collect_keys_info(parse_options_view const& options,
device_span<char const> data,
device_span<uint64_t const> row_offsets,
unsigned long long int* keys_cnt,
thrust::optional<mutable_table_device_view> keys_info,
rmm::cuda_stream_view stream);
} // namespace gpu
} // namespace json
} // namespace io
} // namespace cudf