Method FinishInternal

cpp/src/arrow/array/builder_union.cc:32–46

using internal::checked_pointer_cast;

Status BasicUnionBuilder::FinishInternal(std::shared_ptr<ArrayData>* out) {
  int64_t length = types_builder_.length();

  std::shared_ptr<Buffer> types;
  RETURN_NOT_OK(types_builder_.Finish(&types));

  std::vector<std::shared_ptr<ArrayData>> child_data(children_.size());
  for (size_t i = 0; i < children_.size(); ++i) {
    RETURN_NOT_OK(children_[i]->FinishInternal(&child_data[i]));
  }

  *out = ArrayData::Make(type(), length, {nullptr, types}, /*null_count=*/0);
  (*out)->child_data = std::move(child_data);
  return Status::OK();
}

Status DenseUnionBuilder::AppendArraySlice(const ArraySpan& array, const int64_t offset,
                                           const int64_t length) {