@Override
    public void init(ByteArrayRef bytes, int start, int length) {
      super.init(bytes, start, length);
      parsed = false;
      serializedSize = length;
      fieldInited = false;
      field = null;
      cachedObject = null;
    }
Construct a LazyBinaryUnion object with an ObjectInspector.
serde/src/java/org/apache/hadoop/hive/serde2/lazybinary/LazyBinaryUnion.java