Method Open

cpp/src/parquet/file_reader.cc:774–791

Open the file. If no metadata is passed, it is parsed from the footer of the file

// Open the file. If no metadata is passed, it is parsed from the footer of
// the file
std::unique_ptr<ParquetFileReader::Contents> ParquetFileReader::Contents::Open(
    std::shared_ptr<ArrowInputFile> source, const ReaderProperties& props,
    std::shared_ptr<FileMetaData> metadata) {
  std::unique_ptr<ParquetFileReader::Contents> result(
      new SerializedFile(std::move(source), props));

  // Access private methods here, but otherwise unavailable
  SerializedFile* file = static_cast<SerializedFile*>(result.get());

  if (metadata == nullptr) {
    // Validates magic bytes, parses metadata, and initializes the SchemaDescriptor
    file->ParseMetaData();
  } else {
    file->set_metadata(std::move(metadata));
  }

  return result;
}

Future<std::unique_ptr<ParquetFileReader::Contents>>
ParquetFileReader::Contents::OpenAsync(std::shared_ptr<ArrowInputFile> source,