Thank you. I have applied all your fixes in on_connect_event_trigger-12.patch.
Concerning enable_client_connection_trigger GUC, I think that it is really useful: it is the fastest and simplest way to disable login triggers in case of some problems with them (not only for superuser itself, but for all users). Yes, it can be also done using "ALTER EVENT TRIGGER DISABLE". But assume that you have a lot of databases with different login policies enforced by on-login event triggers. And you want temporary disable them all, for example for testing purposes. In this case GUC is most convenient way to do it.
I have not any objections against functionality or design. I tested the performance, and there are no negative impacts when this feature is not used. There is significant overhead related to plpgsql runtime initialization, but when this trigger will be used, then probably some other PLpgSQL procedures and functions will be used too, and then this overhead can be ignored.
* make without warnings
* make check-world passed
* doc build passed
Possible ToDo:
The documentation can contain a note so usage connect triggers in environments with short life sessions and very short fast queries without usage PLpgSQL functions or procedures can have negative impact on performance due overhead of initialization of PLpgSQL engine.
