pollupdate command not work as expected

[ninuxer]

test case:
1、write some keys, scan can display the keys

2、flushdb and compact, then scan cannot display the keys, but pollupdate can

expected result:
after flushdb and compact, pollupdate cannot get any key like scan

[git-hulk]

@ninuxer Sorry for the late reply due to missing this message.

flushdb and compact, then scan cannot display the keys, but pollupdate can

The POLLUPDATE command is used to poll the write updates, so it's expected to see intermediate states. For example, you send the request: SET a b; DEL a; to Kvrocks, and POLLUPDATE will receive two events SET and DEL.

[ninuxer]

After I executed the FLUSHDB, POLLUPDATES should receive event FLUSHDB.
But in fact, we did not receive that event.