Function io___RandomAccessFile__ReadMetadata

r/src/io.cpp:95–115

[[arrow::export]]

// [[arrow::export]]
cpp11::strings io___RandomAccessFile__ReadMetadata(
    const std::shared_ptr<arrow::io::RandomAccessFile>& x) {
  std::shared_ptr<const arrow::KeyValueMetadata> metadata =
      ValueOrStop(x->ReadMetadata());
  if (metadata.get() == nullptr) {
    return cpp11::writable::strings();
  }

  cpp11::writable::strings metadata_r;
  cpp11::writable::strings metadata_r_names;
  metadata_r.reserve(metadata->size());
  metadata_r_names.reserve(metadata->size());

  for (int64_t i = 0; i < metadata->size(); i++) {
    metadata_r.push_back(metadata->value(i));
    metadata_r_names.push_back(metadata->key(i));
  }

  metadata_r.names() = metadata_r_names;
  return metadata_r;
}

// ------ arrow::io::MemoryMappedFile