public static int compare(Object o1, ObjectInspector oi1, Object o2,
      ObjectInspector oi2) {
    return compare(o1, oi1, o2, oi2, new FullMapEqualComparer());
  }
Compare two objects with their respective ObjectInspectors.
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java