Function MakeUnaryKernel

cpp/src/arrow/compute/kernels/hash_aggregate_internal.h:100–104

}

inline HashAggregateKernel MakeUnaryKernel(KernelInit init) {
  return MakeKernel(KernelSignature::Make({InputType(Type::UINT32)},
                                          OutputType(ResolveGroupOutputType)),
                    std::move(init));
}

using HashAggregateKernelFactory =
    std::function<Result<HashAggregateKernel>(const std::shared_ptr<DataType>&)>;