Comment 1 for bug 1440054

It seems lock released after we execute PREPARE is then taken again after we executed EXECUTE. So, real question remain:

Is there any way to release metadata lock:

mysql> select * from performance_schema.metadata_locks\G
*************************** 1. row ***************************
          OBJECT_TYPE: TABLE
        OBJECT_SCHEMA: test
          OBJECT_NAME: t
OBJECT_INSTANCE_BEGIN: 140044187351136
            LOCK_TYPE: SHARED_READ
        LOCK_DURATION: TRANSACTION
          LOCK_STATUS: GRANTED
               SOURCE: sql_parse.cc:5585
      OWNER_THREAD_ID: 24
       OWNER_EVENT_ID: 16

(the above is the output from 5.7) as soon as we've determined list of columns (prepared the statement) and then do not set it again, even when autocommit=0?