HHH-18556 Add test for issue

Author: dreab8

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

@@ -55,6 +55,30 @@ public void testSelectCaseWhenNullLiteral(SessionFactoryScope scope) {
 		);
 	}
 
+	@Test
+	@JiraKey( "HHH-18556" )
+	public void testSelectCaseWhenNullLiteralWithParameters(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					List result = session.createQuery( "select case when 1=1 then ?1 else null end from Person p" )
+							.setParameter( 1, 2 )
+							.list();
+					assertThat( result.size(), is( 1 ) );
+					assertThat( result.get( 0 ), is( 2 ) );
+				}
+		);
+
+		scope.inTransaction(
+				session -> {
+					List result = session.createQuery( "select count(case when 1=1 then ?1 else null end) from Person p" )
+							.setParameter( 1, 2 )
+							.list();
+					assertThat( result.size(), is( 1 ) );
+					assertThat( result.get( 0 ), is( 1L ) );
+				}
+		);
+	}
+
 	@Entity(name = "Person")
 	@Table(name = "PERSON_TABLE")
 	public static class Person {