Method ReadAsync

cpp/src/arrow/io/file.cc:718–722

}

Future<std::shared_ptr<Buffer>> MemoryMappedFile::ReadAsync(const IOContext&,
                                                            int64_t position,
                                                            int64_t nbytes) {
  return Future<std::shared_ptr<Buffer>>::MakeFinished(ReadAt(position, nbytes));
}

Status MemoryMappedFile::WillNeed(const std::vector<ReadRange>& ranges) {
  using ::arrow::internal::MemoryRegion;