Method SetData

cpp/src/parquet/decoder.cc:2221–2241

      : Base(descr, Encoding::BYTE_STREAM_SPLIT) {}

  void SetData(int num_values, const uint8_t* data, int len) final {
    // Check that the data size is consistent with the number of values
    // The spec requires that the data size is a multiple of the number of values,
    // see: https://github.com/apache/parquet-format/pull/192 .
    // GH-41562: passed in `num_values` may include nulls, so we need to check and
    // adjust the number of values.
    if (static_cast<int64_t>(num_values) * this->type_length_ < len) {
      throw ParquetException(
          "Data size (" + std::to_string(len) +
          ") is too small for the number of values in in BYTE_STREAM_SPLIT (" +
          std::to_string(num_values) + ")");
    }
    if (len % this->type_length_ != 0) {
      throw ParquetException("ByteStreamSplit data size " + std::to_string(len) +
                             " not aligned with type " + TypeToString(DType::type_num) +
                             " and byte width: " + std::to_string(this->type_length_));
    }
    num_values = len / this->type_length_;
    Base::SetData(num_values, data, len);
    stride_ = this->num_values_;
  }

  int DecodeArrow(int num_values, int null_count, const uint8_t* valid_bits,
                  int64_t valid_bits_offset,