main.group_by failed in buildbot with wrong result

main.group_by                            w1 [ fail ]

        Test ended at 2020-01-02 05:14:54

CURRENT_TEST: main.group_by

--- D:/winx64-debug/build/src/mysql-test/r/group_by.result	2020-01-02 04:27:46.548825100 +0000

+++ D:\winx64-debug\build\src\mysql-test\r\group_by.reject	2020-01-02 05:14:53.878028000 +0000

@@ -2800,11 +2800,11 @@

 create view v1 as select a, b+1 as x from t1;

 SELECT x, COUNT(DISTINCT a) AS y FROM v1 GROUP BY x ORDER BY y;

 x	y

-101	2

 201	2

+101	2

 SELECT b+1 AS x, COUNT(DISTINCT a) AS y FROM t1 GROUP BY x ORDER BY y;

 x	y

-101	2

 201	2

+101	2

 drop view v1;

 drop table t1;

mysqltest: Result content mismatch