[EXPLAIN] rocksdb.rocksdb_cf_per_partition failed in buildbot with wrong result

rocksdb.rocksdb_cf_per_partition         w3 [ fail ]

        Test ended at 2018-05-30 04:13:47

CURRENT_TEST: rocksdb.rocksdb_cf_per_partition

--- /usr/share/mysql/mysql-test/plugin/rocksdb/rocksdb/r/rocksdb_cf_per_partition.result	2018-05-30 00:57:32.000000000 -0400

+++ /dev/shm/var/3/log/rocksdb_cf_per_partition.reject	2018-05-30 04:13:47.439314430 -0400

@@ -353,7 +353,7 @@

 test.t2	analyze	status	OK

 EXPLAIN PARTITIONS SELECT  * FROM t2 WHERE col3 = 0x4 AND col2 = 0x34567;

 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	t2	custom_p2	ref	col3	col3	258	const	1	Using where

+1	SIMPLE	t2	custom_p2	ref	col3	col3	258	const	2	Using where

 DROP TABLE t2;

 CREATE TABLE `t2` (

 `col1` bigint(20) NOT NULL,

mysqltest: Result content mismatch