src/main/java/com/googlecode/objectify/impl/QueryEngine.java
public int queryCount(final KeyQuery query) {
		log.trace("Starting count query");

		final QueryResults<com.google.cloud.datastore.Key> results = ds.run(query);
		return Iterators.size(results);
	}
public int queryCount(final KeyQuery query) {
		log.trace("Starting count query");

		final QueryResults<com.google.cloud.datastore.Key> results = ds.run(query);
		return Iterators.size(results);
	}
The fundamental query count operation. This doesn't appear to be implemented in the new SDK, so we simulate
with a keys-only query.