message: Rollback to Nullable(Nothing) for unbound params
diff: @@ -307,7 +307,7 @@ std::string Statement::buildFinalQuery(const std::vector<ParamBindingInfo>& para
  std::string param_type;
  if (param_bindings.size() <= i) {
  - param_type = "Nullable(String)";
  + param_type = "Nullable(Nothing)";
  }
  else {
  const auto & binding_info = param_bindings[i];
  @@ -432,7 +432,7 @@ std::vector<ParamBindingInfo> Statement::getParamsBindingInfo(std::size_t param_
  const auto fully_bound_param_count = std::min(apd_record_count, ipd_record_count);
  // We allow (apd_record_count < ipd_record_count) here, since we will set
  - // all unbound parameters to 'Null' and their types to 'Nullable(String)'.
  + // all unbound parameters to 'Null' and their types to 'Nullable(Nothing)'.
  if (fully_bound_param_count > 0)
  param_bindings.reserve(fully_bound_param_count);
  