code: private void serializeOCCColumn(Object fieldValue, PutAction putAction) {
      // OCC Version mapping, so serialize as a long to the version check
      // column qualifier in the system column family.
      Long currVersion = (Long) fieldValue;
      VersionCheckAction versionCheckAction = new VersionCheckAction(currVersion);
      putAction.getPut().add(Constants.SYS_COL_FAMILY,
          Constants.VERSION_CHECK_COL_QUALIFIER, Bytes.toBytes(currVersion + 1));
      putAction.setVersionCheckAction(versionCheckAction);
    }
docs: Serialize the OCC column value, and update the putAction with the
  serialized bytes.
  
  @param fieldValue
  The value to serialize
  @param putAction
  The PutAction to update.