Method getWriterId

c++/src/Reader.cc:705–715

  }

  WriterId ReaderImpl::getWriterId() const {
    if (footer_->has_writer()) {
      uint32_t id = footer_->writer();
      if (id > WriterId::CUDF_WRITER) {
        return WriterId::UNKNOWN_WRITER;
      } else {
        return static_cast<WriterId>(id);
      }
    }
    return WriterId::ORC_JAVA_WRITER;
  }

  uint32_t ReaderImpl::getWriterIdValue() const {
    if (footer_->has_writer()) {