Function GetKeyValueMetadata

cpp/src/arrow/ipc/metadata_internal.cc:1283–1299

}  // namespace

Result<std::shared_ptr<KeyValueMetadata>> GetKeyValueMetadata(
    const KVVector* fb_metadata) {
  if (fb_metadata == nullptr) {
    return nullptr;
  }

  auto metadata = std::make_shared<KeyValueMetadata>();

  metadata->reserve(fb_metadata->size());
  for (const auto pair : *fb_metadata) {
    CHECK_FLATBUFFERS_NOT_NULL(pair->key(), "custom_metadata.key");
    CHECK_FLATBUFFERS_NOT_NULL(pair->value(), "custom_metadata.value");
    metadata->Append(pair->key()->str(), pair->value()->str());
  }

  return metadata;
}

Result<std::shared_ptr<Buffer>> WriteSchemaMessage(const Schema& schema,
                                                   const DictionaryFieldMapper& mapper,