rocksdb.bloomfilter2 failed in buildbot with wrong result

rocksdb.bloomfilter2                     w3 [ fail ]

        Test ended at 2018-06-14 07:51:01

CURRENT_TEST: rocksdb.bloomfilter2

--- /usr/share/mysql/mysql-test/plugin/rocksdb/rocksdb/r/bloomfilter2.result	2018-06-14 05:17:32.000000000 -0400

+++ /dev/shm/var/3/log/bloomfilter2.reject	2018-06-14 07:51:01.140000001 -0400

@@ -53,7 +53,7 @@

 0

 select case when variable_value-@u > 0 then 'true' else 'false' end from information_schema.global_status where variable_name='rocksdb_bloom_filter_useful';

 case when variable_value-@u > 0 then 'true' else 'false' end

-true

+false

 select variable_value into @u from information_schema.global_status where variable_name='rocksdb_bloom_filter_prefix_useful';

 SELECT COUNT(*) FROM t3 WHERE id1=1 AND id2=1 AND id3=1;

 COUNT(*)

mysqltest: Result length mismatch