Dummy event replacing event type 160 that slave cannot handle

Hi all, 

I have setup Debezium for MariaDB version 10.2.14. I used schema_only for  snapshot.mode in the connector. everything works well, but when I consume data from history topic, I can see lots of these messages:

{
     "source" :

{      "server" : "test_mysql"      }

,
"position" :

{     "ts_sec" : 1593226436,     "file" : "mariadb-bin.084342",     "pos" : 15776524,     "server_id" : 25,     "event" : 1 }

,
    "databaseName" : "",
     "ddl" : "# Dummy event replacing event type 160 that slave cannot handle. "
}

As far as I know, event type 160 is for ANNOTATE_ROWS_EVENT (events accompany row events and describe the query which caused the row event).

why we have these events for schema_only mode? (this type of event is related to row event)

what should I do?

This is producing a huge of dummy data in the history topic and I can not restart the connector. I have to delete the history topic and use schema_only_recovery each time.

Thank you.