[counter] rocksdb.ttl_primary_read_filtering, rocksdb.ttl_secondary_read_filtering fail in buildbot with wrong result

rocksdb.ttl_secondary_read_filtering     w2 [ fail ]

        Test ended at 2018-06-16 00:09:47

CURRENT_TEST: rocksdb.ttl_secondary_read_filtering

--- /usr/share/mysql-test/plugin/rocksdb/rocksdb/r/ttl_secondary_read_filtering.result	2018-06-15 14:23:26.000000000 +0000

+++ /dev/shm/var/2/log/ttl_secondary_read_filtering.reject	2018-06-16 00:09:46.967278093 +0000

@@ -170,13 +170,13 @@

 a

 select variable_value-@c from information_schema.global_status where variable_name='rocksdb_rows_expired';

 variable_value-@c

-0

+16

 set global rocksdb_debug_ttl_ignore_pk = 1;

 set global rocksdb_compact_cf='default';

 set global rocksdb_debug_ttl_ignore_pk = 0;

 select variable_value-@c from information_schema.global_status where variable_name='rocksdb_rows_expired';

 variable_value-@c

-8

+16

 DROP TABLE t1;

 # Attempt to update expired value, should filter out

 set global rocksdb_force_flush_memtable_now=1;

mysqltest: Result length mismatch