@Override
  public HCatEventMessage checkValid() {
    if (getTable() == null)
      throw new IllegalStateException("Table name unset.");
    return super.checkValid();
  }
Get the list of files created as a result of this DML operation.  May be null.
@return List of new files, or null.
hcatalog/server-extensions/src/main/java/org/apache/hive/hcatalog/messaging/InsertMessage.java