Identical expressions in SELECT part are not recognized as being part of GROUP BY part

DROP DATABASE IF EXISTS MCOL_678;

CREATE DATABASE MCOL_678;

USE MCOL_678;

CREATE TABLE t(ci1 integer, ci2 integer) engine=columnstore;

INSERT INTO t(ci1, ci2) VALUES (NULL, 1), (NULL, 2), (1,3), (1,4), (2,5), (2,6), (3,7), (3,8);

SELECT ci1+ci2, ci1+ci2, SUM(ci2), AVG(ci2) FROM t GROUP BY ci1+ci2, ci1+ci2;

DROP TABLE t;

DROP DATABASE MCOL_678;