NullPointerException in case of passing customized FetchOptions to ClusteredQuery iterator() method

While running tests for query module, I've found the following thing. I'm not sure whether this is a bug, but the same flow for CacheQueryImpl works in different way rather than for ClusteredCacheQueryImpl.

I'm running the following command on already created ClusteredQuery:

ResultIterator iterator = cacheQuery.iterator(new FetchOptions() {
         public FetchOptions fetchMode(FetchMode fetchMode) {
            return null;
         }
      });

This code throws NullPointerException, as the check of FetchMode is done in switch/case statement.

The same code for CacheQuery throws IllegalArgumentException, as the check is done with if/else statement.

Please find the test attached.