GROUPING SETS on groups with aliases provided in the SELECT returns empty result

[Mytherin]

To Reproduce

create table students (course TEXT, type TEXT);
insert into students
		(course, type)
	values
		('CS', 'Bachelor'),
		('CS', 'Bachelor'),
		('CS', 'PhD'),
		('Math', 'Masters'),
		('CS', NULL),
		('CS', NULL),
		('Math', NULL);
-- without aliases the query works as expected
select count(*), course, type
        from students
        group by grouping sets((course, type), (type))
        order by 1, 2, 3;
-- with aliases no result is returned
select count(*), course AS crs, type AS tp
        from students
        group by grouping sets((crs, tp), (tp))
        order by 1, 2, 3;

Expected behavior
Expect the following result from both queries:

+------+--------+----------+
| %1   | course | type     |
+======+========+==========+
|    1 | null   | Masters  |
|    1 | null   | PhD      |
|    1 | CS     | PhD      |
|    1 | Math   | null     |
|    1 | Math   | Masters  |
|    2 | null   | Bachelor |
|    2 | CS     | null     |
|    2 | CS     | Bachelor |
|    3 | null   | null     |
+------+--------+----------+

Software versions

• MonetDB v11.41.5 (Jul2021)
• MacOS
• Homebrew

[PedroTadim]

I didn't know grouping columns could contain aliases in in the relational tree. Thanks for the report! It will be fixed on the next release.