@Override
    public boolean equals(Object o) {
      if (o == null || o.getClass() != getClass()) {
        return false;
      } else if (o == this) {
        return true;
      } else {
        OrcMapObjectInspector other = (OrcMapObjectInspector) o;
        return other.key.equals(key) && other.value.equals(value);
      }
    }
Destructively make this object link to other's values.
@param other the value to point to
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcStruct.java