Function ListArrayFromArrays

cpp/src/arrow/array/array_nested.cc:102–142

template <typename TYPE>
Result<std::shared_ptr<typename TypeTraits<TYPE>::ArrayType>> ListArrayFromArrays(
    std::shared_ptr<DataType> type, const Array& offsets, const Array& values,
    MemoryPool* pool, std::shared_ptr<Buffer> null_bitmap = NULLPTR,
    int64_t null_count = kUnknownNullCount) {
  using offset_type = typename TYPE::offset_type;
  using ArrayType = typename TypeTraits<TYPE>::ArrayType;
  using OffsetArrowType = typename CTypeTraits<offset_type>::ArrowType;

  if (offsets.length() == 0) {
    return Status::Invalid("List offsets must have non-zero length");
  }

  if (offsets.type_id() != OffsetArrowType::type_id) {
    return Status::TypeError("List offsets must be ", OffsetArrowType::type_name());
  }

  if (null_bitmap != nullptr && offsets.data()->MayHaveNulls()) {
    return Status::Invalid(
        "Ambiguous to specify both validity map and offsets with nulls");
  }

  if (null_bitmap != nullptr && offsets.offset() != 0) {
    return Status::NotImplemented("Null bitmap with offsets slice not supported.");
  }

  // Clean the offsets if they contain nulls.
  if (offsets.null_count() > 0) {
    ARROW_ASSIGN_OR_RAISE(auto buffers,
                          CleanListOffsets<TYPE>(null_bitmap, offsets, pool));
    auto data = ArrayData::Make(type, offsets.length() - 1, std::move(buffers),
                                {values.data()}, offsets.null_count(), /*offset=*/0);
    return std::make_shared<ArrayType>(std::move(data));
  }

  using OffsetArrayType = typename TypeTraits<OffsetArrowType>::ArrayType;
  const auto& typed_offsets = checked_cast<const OffsetArrayType&>(offsets);
  auto buffers = BufferVector({std::move(null_bitmap), typed_offsets.values()});
  auto data = ArrayData::Make(type, offsets.length() - 1, std::move(buffers),
                              {values.data()}, null_count, offsets.offset());
  return std::make_shared<ArrayType>(std::move(data));
}

template <typename TYPE>
Result<std::shared_ptr<typename TypeTraits<TYPE>::ArrayType>> ListViewArrayFromArrays(