Method appendNonNull

bolt/serializers/PrestoSerializer.cpp:1375–1380

  }

  void appendNonNull(int32_t count = 1) {
    if (nullCount_ > 0) {
      nulls_.appendBool(false, count);
    }
    nonNullCount_ += count;
  }

  void appendLength(int32_t length) {
    totalLength_ += length;