@Override
  public Object getNewValue() {
    if (newValue == null && delta != null) {
      throw new InvalidDeltaException();
    }
    return newValue;
  }
Get the new value of the modification. If there is no new value because this is a delete, then
return null.
geode-cq/src/main/java/org/apache/geode/cache/query/cq/internal/CqEventImpl.java