rocksdb.rocksdb_parts failed in buildbot (sporadic)

rocksdb.rocksdb_parts                    w1 [ fail ]

        Test ended at 2017-09-18 14:31:33

CURRENT_TEST: rocksdb.rocksdb_parts

--- /usr/local/mariadb-10.3.2-linux-x86_64/mysql-test/plugin/rocksdb/rocksdb/r/rocksdb_parts.result	2017-09-18 12:09:47.000000000 +0000

+++ /usr/local/mariadb-10.3.2-linux-x86_64/mysql-test/plugin/rocksdb/rocksdb/r/rocksdb_parts.reject	2017-09-18 14:31:33.018940452 +0000

@@ -76,7 +76,7 @@

 # The following must use "Using index"

 explain select pk from t1 force index(col1) where col1=10;

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	t1	ref	col1	col1	5	const	2000	Using index

+1	SIMPLE	t1	ref	col1	col1	5	const	1001	Using index

 drop table t1;

 #

 # Issue #214: subqueries cause crash

mysqltest: Result content mismatch