@Override
  public void init(ByteArrayRef bytes, int start, int length) {
    super.init(bytes, start, length);
    parsed = false;
    cachedMap = null;
    keyStart = null;
  }
Set the row data for this LazyArray.

@see LazyObject#init(ByteArrayRef, int, int)
serde/src/java/org/apache/hadoop/hive/serde2/lazy/LazyMap.java