private static void internProperties(Properties properties) {
    for (Enumeration<?> keys =  properties.propertyNames(); keys.hasMoreElements();) {
      String key = (String) keys.nextElement();
      String oldValue = properties.getProperty(key);
      if (oldValue != null) {
        properties.setProperty(key, oldValue.intern());
      }
    }
  }
Return a deserializer object corresponding to the partitionDesc.
ql/src/java/org/apache/hadoop/hive/ql/plan/PartitionDesc.java