Function generateNotNull

c++/test/TestByteRLEEncoder.cc:31–42

  const int DEFAULT_MEM_STREAM_SIZE = 1024 * 1024;  // 1M

  void generateNotNull(uint64_t numValues, uint64_t numNulls, char* notNull) {
    if (numNulls != 0 && notNull != nullptr) {
      memset(notNull, 1, numValues);
      while (numNulls > 0) {
        uint64_t pos = static_cast<uint64_t>(std::rand()) % numValues;
        if (notNull[pos]) {
          notNull[pos] = static_cast<char>(0);
          --numNulls;
        }
      }
    }
  }

  void generateData(uint64_t numValues, char* data, uint64_t numNulls = 0,
                    char* notNull = nullptr) {