public static void persistDummyTable(ObjectOutputStream out) throws IOException {
    MapJoinPersistableTableContainer tableContainer = new HashMapWrapper();
    out.writeUTF(tableContainer.getClass().getName());
    out.writeObject(tableContainer.getMetaData());
    out.writeInt(tableContainer.size());
  }
Loads the table container. Only used on MR path.
@param in Input stream.
@return Loaded table.
ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/MapJoinTableContainerSerDe.java