RocksDB: Failed to get column family flags from cf, SIGABRT in myrocks::Rdb_drop_index_thread::run

INSTALL SONAME 'ha_rocksdb';

CREATE TABLE t1 (pk INT PRIMARY KEY, a INT) ENGINE=RocksDB;

INSERT INTO t1 VALUES (1,1),(2,1);

--error ER_DUP_ENTRY

ALTER TABLE t1 ADD UNIQUE (a) COMMENT 'foo';

CREATE TABLE t2 (b INT) ENGINE=RocksDB;

DROP TABLE t2;

2020-03-12 18:50:02 0 [ERROR] RocksDB: Failed to get column family flags from cf id 2. MyRocks data dictionary may get corrupted.

200312 18:50:02 [ERROR] mysqld got signal 6 ;

#3  <signal handler called>

#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

#5  0x00007fd12e0a142a in __GI_abort () at abort.c:89

#6  0x00007fd0d3638976 in myrocks::Rdb_drop_index_thread::run (this=0x7fd0d3feb5e0 <myrocks::rdb_drop_idx_thread>) at /data/src/10.4/storage/rocksdb/ha_rocksdb.cc:11604

#7  0x00007fd0d36e5206 in myrocks::Rdb_thread::thread_func (thread_ptr=0x7fd0d3feb5e0 <myrocks::rdb_drop_idx_thread>) at /data/src/10.4/storage/rocksdb/rdb_threads.cc:34

#8  0x00007fd1300214a4 in start_thread (arg=0x7fd0bb7f6700) at pthread_create.c:456

#9  0x00007fd12e155d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97