Function ValueCountsFinalize

cpp/src/arrow/compute/kernels/vector_hash.cc:639–649

}

Status ValueCountsFinalize(KernelContext* ctx, std::vector<Datum>* out) {
  auto hash_impl = checked_cast<HashKernel*>(ctx->state());
  std::shared_ptr<ArrayData> uniques;

  RETURN_NOT_OK(hash_impl->GetDictionary(&uniques));

  ExecResult result;
  RETURN_NOT_OK(hash_impl->FlushFinal(&result));
  *out = {Datum(BoxValueCounts(uniques, result.array_data()))};
  return Status::OK();
}

// Return the dictionary from the hash kernel or allocate an empty one.
// Required because on empty inputs, we don't ever see the input and