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