public String serialize() {
    StringBuilder sb = new StringBuilder(16);
    sb.append(columnFamily).append(AccumuloHiveConstants.COLON);
    if (null != columnQualifier) {
      sb.append(columnQualifier);
    }
    return sb.toString();
  }
Cached bytes for the columnQualifier. Modifications to the bytes will affect those stored in
this ColumnMapping -- such modifications are highly recommended against.

@return UTF8 formatted bytes
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/columns/HiveAccumuloColumnMapping.java