@Override
  public boolean equals(Object other) {
    if (other == this) {
      return true;
    }
    if (!(other instanceof ResultsSet)) {
      return false;
    }
    if (!elementType.equals(((ResultsSet) other).elementType)) {
      return false;
    }
    return super.equals(other);
  }
Empty constructor to satisfy <code>DataSerializer</code> requirements
geode-core/src/main/java/org/apache/geode/cache/query/internal/ResultsSet.java