Method metadata

cpp/src/arrow/dataset/file_parquet.cc:796–799

      row_groups_(std::move(row_groups)) {}

std::shared_ptr<parquet::FileMetaData> ParquetFileFragment::metadata() {
  auto lock = physical_schema_mutex_.Lock();
  return metadata_;
}

Status ParquetFileFragment::EnsureCompleteMetadata(parquet::arrow::FileReader* reader) {
  auto lock = physical_schema_mutex_.Lock();