docs: @Override
      public int compareRowNonUnique(Object[] a, Object[] b, int fieldcount) {
  
          for (int j = 0; j < fieldcount; j++) {
              int i = colTypes[j].compare(a[j], b[colIndex[j]]);
  
              if (i != 0) {
                  return i;
              }
          }
  
          return 0;
      }