Method UnsafeAppendNull

cpp/src/arrow/array/builder_binary.h:173–177

  }

  void UnsafeAppendNull() {
    const int64_t num_bytes = value_data_builder_.length();
    offsets_builder_.UnsafeAppend(static_cast<offset_type>(num_bytes));
    UnsafeAppendToBitmap(false);
  }

  void UnsafeAppendEmptyValue() {
    const int64_t num_bytes = value_data_builder_.length();