public static NullOrdering defaultNullOrder(Configuration hiveConf) {
    return defaultNullsLast(HiveConf.getBoolVar(hiveConf, HiveConf.ConfVars.HIVE_DEFAULT_NULLS_LAST));
  }
Enum for converting different Null ordering description types.
ql/src/java/org/apache/hadoop/hive/ql/util/NullOrdering.java