@Override
  public SerDeStats getStats() {
    SerDeStats stats = new SerDeStats();
    stats.setRowCount(rowCountDelta);
    stats.setInsertCount(insertCount);
    stats.setUpdateCount(updateCount);
    stats.setDeleteCount(deleteCount);
    // Don't worry about setting raw data size diff.  I have no idea how to calculate that
    // without finding the row we are updating or deleting, which would be a mess.
    return stats;
  }
make sure bucketProperty in the delete event is from the {@link row} rather than whatever
{@link this#bucket} is.  For bucketed tables, the 2 must agree on bucketId encoded in it
not for necessarily the whole value.  For unbucketed tables there is no relationship.
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcRecordUpdater.java