HHH-17415 Add test for issue

Author: mbellade

hibernate-core/src/test/java/org/hibernate/orm/test/query/EntityValuedPathsGroupByOrderByTest.java

@@ -153,6 +153,25 @@ public void testImplicitJoinSelectAndGroupByAndOrderBy(SessionFactoryScope scope
 		).getSingleResult().get( 1 ) ).isEqualTo( 3L ) );
 	}
 
+	@Test
+	@Jira( "https://hibernate.atlassian.net/browse/HHH-17415" )
+	public void testInSubqueryGroupBy(SessionFactoryScope scope) {
+		scope.inTransaction( session -> assertThat( session.createQuery(
+				"select a from EntityA a where a.secondary in (select b2 from EntityB b2 group by b2)",
+				Tuple.class
+		).getResultList() ).hasSize( 2 ) );
+	}
+
+	@Test
+	@Jira( "https://hibernate.atlassian.net/browse/HHH-17415" )
+	public void testInSubqueryGroupByImplicitJoin(SessionFactoryScope scope) {
+		scope.inTransaction( session -> assertThat( session.createQuery(
+				"select a from EntityA a where a.secondary in" +
+						" (select a2.secondary from EntityA a2 group by a2.secondary)",
+				Tuple.class
+		).getResultList() ).hasSize( 2 ) );
+	}
+
 	@Entity( name = "EntityA" )
 	public static class EntityA {
 		@Id