Remove unused parsing utilities (#15955)

Some parsing utilities have been unused since legacy JSON removal.
This PR removes these functions.

Authors:
  - Vukasin Milovanovic (https://github.com/vuule)

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Nghia Truong (https://github.com/ttnghia)
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #15955

cpp/CMakeLists.txt

@@ -439,7 +439,6 @@ add_library(
   src/io/utilities/data_sink.cpp
   src/io/utilities/datasource.cpp
   src/io/utilities/file_io_utilities.cpp
-  src/io/utilities/parsing_utils.cu
   src/io/utilities/row_selection.cpp
   src/io/utilities/type_inference.cu
   src/io/utilities/trie.cu

cpp/src/io/utilities/parsing_utils.cuh

@@ -414,82 +414,6 @@ __device__ __inline__ cudf::size_type* infer_integral_field_counter(char const*
 
 }  // namespace gpu
 
-/**
- * @brief Searches the input character array for each of characters in a set.
- * Sums up the number of occurrences. If the 'positions' parameter is not void*,
- * positions of all occurrences are stored in the output device array.
- *
- * @param[in] d_data Input character array in device memory
- * @param[in] keys Vector containing the keys to count in the buffer
- * @param[in] result_offset Offset to add to the output positions
- * @param[out] positions Array containing the output positions
- * @param[in] stream CUDA stream used for device memory operations and kernel launches
- *
- * @return cudf::size_type total number of occurrences
- */
-template <class T>
-cudf::size_type find_all_from_set(device_span<char const> data,
-                                  std::vector<char> const& keys,
-                                  uint64_t result_offset,
-                                  T* positions,
-                                  rmm::cuda_stream_view stream);
-
-/**
- * @brief Searches the input character array for each of characters in a set.
- * Sums up the number of occurrences. If the 'positions' parameter is not void*,
- * positions of all occurrences are stored in the output device array.
- *
- * Does not load the entire file into the GPU memory at any time, so it can
- * be used to parse large files. Output array needs to be preallocated.
- *
- * @param[in] h_data Pointer to the input character array
- * @param[in] h_size Number of bytes in the input array
- * @param[in] keys Vector containing the keys to count in the buffer
- * @param[in] result_offset Offset to add to the output positions
- * @param[out] positions Array containing the output positions
- * @param[in] stream CUDA stream used for device memory operations and kernel launches
- *
- * @return cudf::size_type total number of occurrences
- */
-template <class T>
-cudf::size_type find_all_from_set(host_span<char const> data,
-                                  std::vector<char> const& keys,
-                                  uint64_t result_offset,
-                                  T* positions,
-                                  rmm::cuda_stream_view stream);
-
-/**
- * @brief Searches the input character array for each of characters in a set
- * and sums up the number of occurrences.
- *
- * @param d_data Input data buffer in device memory
- * @param keys Vector containing the keys to count in the buffer
- * @param stream CUDA stream used for device memory operations and kernel launches
- *
- * @return cudf::size_type total number of occurrences
- */
-cudf::size_type count_all_from_set(device_span<char const> data,
-                                   std::vector<char> const& keys,
-                                   rmm::cuda_stream_view stream);
-
-/**
- * @brief Searches the input character array for each of characters in a set
- * and sums up the number of occurrences.
- *
- * Does not load the entire buffer into the GPU memory at any time, so it can
- * be used with buffers of any size.
- *
- * @param h_data Pointer to the data in host memory
- * @param h_size Size of the input data, in bytes
- * @param keys Vector containing the keys to count in the buffer
- * @param stream CUDA stream used for device memory operations and kernel launches
- *
- * @return cudf::size_type total number of occurrences
- */
-cudf::size_type count_all_from_set(host_span<char const> data,
-                                   std::vector<char> const& keys,
-                                   rmm::cuda_stream_view stream);
-
 /**
  * @brief Checks whether the given character is a whitespace character.
  *