Test main.derived is unstable

[Laurynas Biveinis]

On 5.6 trunk:

main.derived w2 [ fail ]
        Test ended at 2016-12-09 08:42:56

CURRENT_TEST: main.derived
--- /mnt/workspace/percona-server-5.6-trunk/BUILD_TYPE/debug/Host/ubuntu-xenial-32bit/mysql-test/r/derived.result 2016-12-07 15:06:32.601808064 +0300
+++ /mnt/workspace/percona-server-5.6-trunk/BUILD_TYPE/debug/Host/ubuntu-xenial-32bit/build/mysql-test/var/2/log/derived.reject 2016-12-09 16:42:54.580251991 +0300
@@ -2002,7 +2002,7 @@
 id select_type table type possible_keys key key_len ref rows Extra
 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 NULL
 1 PRIMARY <derived2> ref <auto_key1> <auto_key1> 4 test.t2.a 2 Using where
-2 DERIVED t1 ALL NULL NULL NULL NULL 9 NULL
+2 DERIVED t1 ALL NULL NULL NULL NULL 10 NULL
 SELECT a1.a, a1.b, a1.c FROM (SELECT a, b, c FROM t1 ) a1
 JOIN t2 ON a1.a=t2.a WHERE a1.b='xxx';
 a b c

mysqltest: Result content mismatch

[Laurynas Biveinis (laurynas-biveinis)]

     https://github.com/percona/percona-server/pull/1244
     https://github.com/percona/percona-server/pull/1245

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-3617