Method VisitBinary

python/pyarrow/src/arrow/python/numpy_to_arrow.cc:568–597

template <typename T>
Status NumPyConverter::VisitBinary(T* builder) {
  auto data = reinterpret_cast<const uint8_t*>(PyArray_DATA(arr_));

  auto AppendNotNull = [builder, this](const uint8_t* data) {
    // This is annoying. NumPy allows strings to have nul-terminators, so
    // we must check for them here
    const size_t item_size =
        strnlen(reinterpret_cast<const char*>(data), static_cast<size_t>(itemsize_));
    return builder->Append(data, static_cast<int32_t>(item_size));
  };

  if (mask_ != nullptr) {
    Ndarray1DIndexer<uint8_t> mask_values(mask_);
    for (int64_t i = 0; i < length_; ++i) {
      if (mask_values[i]) {
        RETURN_NOT_OK(builder->AppendNull());
      } else {
        RETURN_NOT_OK(AppendNotNull(data));
      }
      data += stride_;
    }
  } else {
    for (int64_t i = 0; i < length_; ++i) {
      RETURN_NOT_OK(AppendNotNull(data));
      data += stride_;
    }
  }

  return Status::OK();
}

Status NumPyConverter::Visit(const BinaryType& type) {
  ::arrow::internal::ChunkedBinaryBuilder builder(kBinaryChunksize, pool_);