Method CheckRoundtrip

cpp/src/parquet/encoding_test.cc:319–335

  static constexpr int TYPE = Type::type_num;

  virtual void CheckRoundtrip() {
    auto encoder =
        MakeTypedEncoder<Type>(Encoding::PLAIN, /*use_dictionary=*/false, descr_.get());
    auto decoder = MakeTypedDecoder<Type>(Encoding::PLAIN, descr_.get());
    encoder->Put(draws_, num_values_);
    encode_buffer_ = encoder->FlushValues();
    if constexpr (std::is_same_v<Type, ByteArrayType>) {
      ASSERT_EQ(encoder->ReportUnencodedDataBytes(),
                this->unencoded_byte_array_data_bytes_);
    }

    decoder->SetData(num_values_, encode_buffer_->data(),
                     static_cast<int>(encode_buffer_->size()));
    int values_decoded = decoder->Decode(decode_buf_, num_values_);
    ASSERT_EQ(num_values_, values_decoded);
    ASSERT_NO_FATAL_FAILURE(VerifyResults<c_type>(decode_buf_, draws_, num_values_));
  }

  void CheckRoundtripSpaced(const uint8_t* valid_bits, int64_t valid_bits_offset) {
    auto encoder =