Обсуждение: trigger functions can only be called as triggers

Is there a reason why the function manager allows calling trigger functions 
outside of triggers and forces the PLs to catch this case themselves?  Is 
there a case where calling trigger functions directly is useful?

Peter Eisentraut <peter_e@gmx.net> writes:
> Is there a reason why the function manager allows calling trigger functions 
> outside of triggers and forces the PLs to catch this case themselves?  Is 
> there a case where calling trigger functions directly is useful?

I think it's a matter of not wanting to slow down *all* function calls
with an error check that's useless for most.
        regards, tom lane