This should not be allowed.

   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)