Method ExportMetadata

cpp/src/arrow/c/bridge.cc:289–313

  }

  Status ExportMetadata(const KeyValueMetadata* orig_metadata) {
    static const KeyValueMetadata empty_metadata;

    if (orig_metadata == nullptr) {
      orig_metadata = &empty_metadata;
    }
    if (additional_metadata_.empty()) {
      if (orig_metadata->size() > 0) {
        ARROW_ASSIGN_OR_RAISE(export_.metadata_, EncodeMetadata(*orig_metadata));
      }
      return Status::OK();
    }
    // Additional metadata needs to be appended to the existing
    // (for extension types)
    KeyValueMetadata metadata(orig_metadata->keys(), orig_metadata->values());
    for (const auto& kv : additional_metadata_) {
      // The metadata may already be there => ignore
      if (metadata.Contains(kv.first)) {
        continue;
      }
      metadata.Append(kv.first, kv.second);
    }
    ARROW_ASSIGN_OR_RAISE(export_.metadata_, EncodeMetadata(metadata));
    return Status::OK();
  }

  Status SetFormat(std::string s) {
    export_.format_ = std::move(s);