public void testGroupingAndAggregationOnSameField() {
      QueryFactory qf = getQueryFactory();
      Query q = qf.from(getModelFactory().getUserImplClass())
            .select(Expression.count("surname"), Expression.sum("addresses.number"))
            .groupBy("surname")
            .build();

      List<Object[]> list = q.list(); // throws ClassCastException
   }

java.lang.ClassCastException: java.lang.String cannot be cast to org.infinispan.objectfilter.impl.aggregation.Counter
	at org.infinispan.objectfilter.impl.aggregation.CountAccumulator.merge(CountAccumulator.java:24)
	at org.infinispan.objectfilter.impl.aggregation.FieldAccumulator.merge(FieldAccumulator.java:42)
	at org.infinispan.objectfilter.impl.aggregation.Grouper.addRow(Grouper.java:133)
	at org.infinispan.query.dsl.embedded.impl.AggregatingQuery.getBaseIterator(AggregatingQuery.java:52)
	at org.infinispan.query.dsl.embedded.impl.HybridQuery$1.<init>(HybridQuery.java:47)
	at org.infinispan.query.dsl.embedded.impl.HybridQuery.getIterator(HybridQuery.java:45)
	at org.infinispan.query.dsl.embedded.impl.BaseEmbeddedQuery.listInternal(BaseEmbeddedQuery.java:65)
	at org.infinispan.query.dsl.embedded.impl.BaseEmbeddedQuery.list(BaseEmbeddedQuery.java:57)
	at org.infinispan.query.dsl.embedded.impl.DelegatingQuery.list(DelegatingQuery.java:45)
	at org.infinispan.query.dsl.embedded.QueryDslConditionsTest.testEmbeddedSum(QueryDslConditionsTest.java:1959)