bugfixes.MCOL-5430-windowfuncs-with-groupby test does not do a proper cleanup

]0;mtr: spent 0:46:37 on 458 tests. 0:06:49 (67 tests) left, 0 failedcolumnstore/bugfixes.MCOL-5430-windowfuncs-with-groupby [ pass ]   1270

]0;mtr: spent 0:46:38 on 459 tests. 0:06:42 (66 tests) left, 0 failed

MTR's internal check of the test case 'columnstore/bugfixes.MCOL-5430-windowfuncs-with-groupby' failed.

This means that the test case does not preserve the state that existed

before the test case was executed.  Most likely the test case did not

do a proper clean-up. It could also be caused by the previous test run

by this thread, if the server wasn't restarted.

This is the diff of the states of the servers before and after the

test case was executed:

mysqltest: Logging to '/usr/share/mysql/mysql-test/var/tmp/check-mysqld_1.log'.

mysqltest: Results saved in '/usr/share/mysql/mysql-test/var/tmp/check-mysqld_1.result'.

mysqltest: Connecting to server localhost:19000 (socket /usr/share/mysql/mysql-test/var/tmp/mysqld.1.sock) as 'root', connection 'default', attempt 0 ...

mysqltest: ... Connected.

mysqltest: Start processing test commands from './include/check-testcase.test' ...

mysqltest: ... Done processing test commands.

--- /usr/share/mysql/mysql-test/var/tmp/check-mysqld_1.result	2026-08-25 01:03:50.473045200 +0000

+++ /usr/share/mysql/mysql-test/var/tmp/check-mysqld_1.reject	2026-08-25 01:03:51.797068504 +0000

@@ -854,7 +854,7 @@

 Table	Checksum

 mysql.columns_priv	0

 mysql.db	1361904150

-mysql.func	0

+mysql.func	726499768

 mysql.help_category	920235239

 mysql.help_keyword	1315967545

 mysql.help_relation	1435219864

Result length mismatch

not ok

worker[01] > Restart  - not started

"Check that quick mode is enabled"