Trigger function on Warm Standby

Hi all,

I have a Primary Standby setup with streaming replication.
Trigger is created on a table, and all it does it to log a message.

The trigger works as expected on Primary, however, I don't see the same on
standby.

I alter the table to have ENABLE ALWAYS TRIGGER, I verified the setting on
both Primary and Standby which is set to A.

Standby:
-bash-4.1$ psql -c "select tgrelid, tgname, tgenabled from pg_trigger where
tgname='processnodeafter'"
tgrelid | tgname | tgenabled
---------+------------------+-----------
19218 | processnodeafter | A

Primary:
postgres=# select tgrelid, tgname, tgenabled from pg_trigger where
tgname='processnodeafter';
tgrelid | tgname | tgenabled
---------+------------------+-----------
19218 | processnodeafter | A
(1 row)

Can someone tell me if the trigger will never happen on the Standby server?
Is it expected or am I missing some other settings?

Thanks~
Ning