public long getTimestampMillis() {
      return timestampMillis;
    }
Value object class, that stores the delete orphan files operation specific parameters.
<ul>
  <li>timestampMillis: the time before which files should be considered to be deleted</li>
</ul>
ql/src/java/org/apache/hadoop/hive/ql/parse/AlterTableExecuteSpec.java