main.group_by fails on buildbots

--- /home/buildbot/amd64-fedora-42/build/mysql-test/main/group_by.result	2026-04-16 09:54:40.000000000 +0000

+++ /home/buildbot/amd64-fedora-42/build/mysql-test/main/group_by.reject	2026-04-16 10:03:18.818842449 +0000

@@ -2623,8 +2623,8 @@

 SET sql_mode='ONLY_FULL_GROUP_BY';

 SELECT 1 AS test UNION SELECT 2 AS test ORDER BY test IS NULL ASC;

 test

-1

 2

+1

 SET sql_mode='';

 #

 # MDEV-6484: Assertion `tab->ref.use_count' failed on query with joins, constant table, multi-part key