@Override
  public CloseableIterator<CachedDeserializable> keyIterator(Object start, boolean startInclusive) {
    byte[] startBytes = startInclusive ? ByteComparator.MIN_BYTES : ByteComparator.MAX_BYTES;
    return new KeyItr(
        map.tailMap(new Pair(start, startBytes), startInclusive).entrySet().iterator());
  }
A dummy implementation of an IndexMap. Keeps all of the entries in memory, but in serialized
form.
geode-core/src/main/java/org/apache/geode/internal/cache/persistence/query/mock/IndexMapImpl.java