Function RegisterHashAggregateBasic

cpp/src/arrow/compute/kernels/hash_aggregate.cc:2340–2486

}  // namespace

void RegisterHashAggregateBasic(FunctionRegistry* registry) {
  static const auto default_count_options = CountOptions::Defaults();
  static const auto default_scalar_aggregate_options = ScalarAggregateOptions::Defaults();
  static const auto default_tdigest_options = TDigestOptions::Defaults();
  static const auto default_variance_options = VarianceOptions::Defaults();
  static const auto default_skew_options = SkewOptions::Defaults();

  {
    auto func = std::make_shared<HashAggregateFunction>(
        "hash_count", Arity::Binary(), hash_count_doc, &default_count_options);

    DCHECK_OK(func->AddKernel(
        MakeKernel(InputType::Any(), HashAggregateInit<GroupedCountImpl>)));
    DCHECK_OK(registry->AddFunction(std::move(func)));
  }

  {
    auto func = std::make_shared<HashAggregateFunction>("hash_count_all", Arity::Unary(),
                                                        hash_count_all_doc, NULLPTR);

    DCHECK_OK(func->AddKernel(MakeUnaryKernel(HashAggregateInit<GroupedCountAllImpl>)));
    auto status = registry->AddFunction(std::move(func));
    DCHECK_OK(status);
  }

  HashAggregateFunction* first_last_func = nullptr;
  {
    auto func = std::make_shared<HashAggregateFunction>(
        "hash_first_last", Arity::Binary(), hash_first_last_doc,
        &default_scalar_aggregate_options);

    DCHECK_OK(
        AddHashAggKernels(NumericTypes(), GroupedFirstLastFactory::Make, func.get()));
    DCHECK_OK(
        AddHashAggKernels(TemporalTypes(), GroupedFirstLastFactory::Make, func.get()));
    DCHECK_OK(
        AddHashAggKernels(BaseBinaryTypes(), GroupedFirstLastFactory::Make, func.get()));
    DCHECK_OK(AddHashAggKernels({boolean(), fixed_size_binary(1)},
                                GroupedFirstLastFactory::Make, func.get()));

    first_last_func = func.get();
    DCHECK_OK(registry->AddFunction(std::move(func)));
  }

  {
    auto func = std::make_shared<HashAggregateFunction>(
        "hash_first", Arity::Binary(), hash_first_doc, &default_scalar_aggregate_options);
    DCHECK_OK(
        func->AddKernel(MakeFirstOrLastKernel<FirstOrLast::First>(first_last_func)));
    DCHECK_OK(registry->AddFunction(std::move(func)));
  }

  {
    auto func = std::make_shared<HashAggregateFunction>(
        "hash_last", Arity::Binary(), hash_last_doc, &default_scalar_aggregate_options);
    DCHECK_OK(func->AddKernel(MakeFirstOrLastKernel<FirstOrLast::Last>(first_last_func)));
    DCHECK_OK(registry->AddFunction(std::move(func)));
  }