Function BenchmarkFieldPathGet

cpp/src/arrow/type_benchmark.cc:477–498

template <typename T>
static void BenchmarkFieldPathGet(benchmark::State& state,  // NOLINT non-const reference
                                  const T& input, int num_columns,
                                  std::optional<int> num_chunks = {}) {
  // Reassigning a single FieldPath var within each iteration's scope seems to be costly
  // enough to influence the timings, so we preprocess them.
  std::vector<FieldPath> paths(num_columns);
  for (int i = 0; i < num_columns; ++i) {
    paths[i] = {i};
  }

  for (auto _ : state) {
    for (const auto& path : paths) {
      benchmark::DoNotOptimize(path.Get(input).ValueOrDie());
    }
  }

  state.SetItemsProcessed(state.iterations() * num_columns);
  state.counters["num_columns"] = num_columns;
  if (num_chunks.has_value()) {
    state.counters["num_chunks"] = num_chunks.value();
  }
}

static void FieldPathGetFromWideArray(
    benchmark::State& state) {  // NOLINT non-const reference