Method AppendChild

cpp/src/arrow/array/builder_union.cc:100–111

}

int8_t BasicUnionBuilder::AppendChild(const std::shared_ptr<ArrayBuilder>& new_child,
                                      const std::string& field_name) {
  children_.push_back(new_child);
  auto new_type_id = NextTypeId();

  type_id_to_child_id_[new_type_id] = static_cast<int>(children_.size() - 1);
  type_id_to_children_[new_type_id] = new_child.get();
  child_fields_.push_back(field(field_name, nullptr));
  type_codes_.push_back(static_cast<int8_t>(new_type_id));

  return new_type_id;
}

std::shared_ptr<DataType> BasicUnionBuilder::type() const {
  std::vector<std::shared_ptr<Field>> child_fields(child_fields_.size());