Function AddHashAggKernels

cpp/src/arrow/compute/kernels/hash_aggregate_internal.h:110–118

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

inline Status AddHashAggKernels(const std::vector<std::shared_ptr<DataType>>& types,
                                HashAggregateKernelFactory make_kernel,
                                HashAggregateFunction* function) {
  for (const auto& ty : types) {
    ARROW_ASSIGN_OR_RAISE(auto kernel, make_kernel(ty));
    RETURN_NOT_OK(function->AddKernel(std::move(kernel)));
  }
  return Status::OK();
}

// ----------------------------------------------------------------------
// Helpers for more easily implementing hash aggregates