[BeginnerQuestion]Why these is 6 rows in my SELECT statement?

From: BeginnerC <chuxuec(at)outlook(dot)com>
To: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: [BeginnerQuestion]Why these is 6 rows in my SELECT statement?
Date: 2022-09-08 08:37:00
Message-ID: TYAP286MB063680EB7BB92F95F170FA65A9409@TYAP286MB0636.JPNP286.PROD.OUTLOOK.COM
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Hello community,
I am checking my pg_stat_activity view,but something confused me.
Just like this:

postgres=# SELECT wait_event_type, wait_event FROM pg_stat_activity;
wait_event_type | wait_event
-----------------+---------------------
Activity | AutoVacuumMain
Activity | LogicalLauncherMain
|
Activity | BgWriterHibernate
Activity | CheckpointerMain
Activity | WalWriterMain
(6 rows)

As you can see, the third row is empty,but I don't know why.
Can anyone provide some solution to me?
Thanks in advance!

Yours,
BeginnerC.

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