Function HashAggregateInit

cpp/src/arrow/compute/kernels/hash_aggregate_internal.h:54–60

template <typename Impl>
Result<std::unique_ptr<KernelState>> HashAggregateInit(KernelContext* ctx,
                                                       const KernelInitArgs& args) {
  auto impl = std::make_unique<Impl>();
  RETURN_NOT_OK(impl->Init(ctx->exec_context(), args));
  // R build with openSUSE155 requires an explicit unique_ptr construction
  return std::unique_ptr<KernelState>(std::move(impl));
}

inline Status HashAggregateResize(KernelContext* ctx, int64_t num_groups) {
  return checked_cast<GroupedAggregator*>(ctx->state())->Resize(num_groups);