Method Dict

cpp/src/parquet/encoding_test.cc:1047–1077

  }

  void Dict(int seed) {
    if (std::is_same<ParquetType, BooleanType>::value) {
      return;
    }

    auto values = GetValues(seed);

    auto owned_encoder =
        MakeTypedEncoder<ParquetType>(Encoding::PLAIN,
                                      /*use_dictionary=*/true, column_descr());
    auto encoder = dynamic_cast<DictEncoder<ParquetType>*>(owned_encoder.get());

    ASSERT_NO_THROW(encoder->Put(*values));

    std::shared_ptr<Buffer> buf, dict_buf;
    int num_values = static_cast<int>(values->length() - values->null_count());

    std::unique_ptr<TypedDecoder<ParquetType>> decoder;
    GetDictDecoder(encoder, num_values, &buf, &dict_buf, column_descr(), &decoder);

    BuilderType acc(arrow_type(), ::arrow::default_memory_pool());
    ASSERT_EQ(num_values,
              decoder->DecodeArrow(static_cast<int>(values->length()),
                                   static_cast<int>(values->null_count()),
                                   values->null_bitmap_data(), values->offset(), &acc));

    std::shared_ptr<::arrow::Array> result;
    ASSERT_OK(acc.Finish(&result));
    ASSERT_OK(result->ValidateFull());
    ::arrow::AssertArraysEqual(*values, *result);
  }

  void DictPutIndices() {
    if (std::is_same<ParquetType, BooleanType>::value) {