code: private ByteBuffer subColumnNameAsBytes(String superColumn, String columnFamily)
      {
          CfDef columnFamilyDef = getCfDef(columnFamily);
          return subColumnNameAsBytes(superColumn, columnFamilyDef);
      }
docs: Converts sub-column name into ByteBuffer according to comparator type
  @param superColumn - sub-column name from parser
  @param columnFamily - column family name from parser
  @return ByteBuffer bytes - into which column name was converted according to comparator type