code: private byte[] subColumnNameAsByteArray(String superColumn, CfDef cfDef)
      {
          return TBaseHelper.byteBufferToByteArray(subColumnNameAsBytes(superColumn, cfDef));
      }
docs: Converts sub-column name into byte[] according to comparator type
  @param superColumn - sub-column name from parser
  @param cfDef - column family from parser
  @return bytes[] - into which column name was converted according to comparator type