Method EncodeDictBenchmark

cpp/src/parquet/encoding_benchmark.cc:1416–1434

  template <typename IndexType>
  void EncodeDictBenchmark(benchmark::State& state) {
    constexpr int64_t nunique = 100;
    constexpr int64_t min_length = 32;
    constexpr int64_t max_length = 32;
    ::arrow::random::RandomArrayGenerator rag(0);
    auto dict = rag.String(nunique, min_length, max_length,
                           /*null_probability=*/0);
    auto indices = rag.Numeric<IndexType, int32_t>(num_values_, 0, nunique - 1);

    auto PutValues = [&](ByteArrayEncoder* encoder) {
      auto dict_encoder = dynamic_cast<DictEncoder<ByteArrayType>*>(encoder);
      dict_encoder->PutDictionary(*dict);
      dict_encoder->PutIndices(*indices);
    };
    for (auto _ : state) {
      DoEncode(std::move(PutValues));
    }
    state.SetItemsProcessed(state.iterations() * num_values_);
  }

  void DoEncodeArrow() override {
    auto PutValues = [&](ByteArrayEncoder* encoder) {