0.90%  JOIN::join_free
  0.72%  mysql_unlock_read_tables
    0.70%  unlock_external
      0.68%  handler::ha_external_lock
        0.62% ha_innobase::external_lock
          0.50% innobase_commit

2.18%  JOIN::join_free
  1.22%  JOIN::cleanup
    1.15%  cleanup_table
      1.09%  ha_rocksdb::index_end
        ... destructors - some MyRocks and many more RocksDB class instances
  0.88%  mysql_unlock_read_tables
    0.85%  unlock_external
      0.81%  handler::ha_external_lock
        0.75%  ha_rocksdb::external_lock
          0.70%  Rdb_transaction::commit
            0.66%  Rdb_transaction_impl::rollback
               ...