code: private void onSetSubComparator(CfDef cfDef, Properties cfProperties, StringBuilder builder)
      {
          String subComparatorType = cfProperties.getProperty(CassandraConstants.SUBCOMPARATOR_TYPE);
          if (subComparatorType != null && ColumnFamilyType.valueOf(cfDef.getColumn_type()) == ColumnFamilyType.Super)
          {
              if (builder != null)
              {
                  // super column are not supported for composite key as of
                  // now, leaving blank place holder..
              }
              else
              {
                  cfDef.setSubcomparator_type(subComparatorType);
              }
          }
      }
docs: On set sub comparator.
  
  @param cfDef
  the cf def
  @param cfProperties
  the cf properties
  @param builder
  the builder