Re: Enhancement proposal - detect chain of triggers from inside the trigger

Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> 2013/1/16 Edson Richter <edsonrichter(at)hotmail(dot)com>:
>> I was wondering, would be a nice addition the ability to read the chain of
>> triggers (may be another trigger variable like TG_OP, called "TG_CHAIN" or
>> something else that will be an array with the name of the triggers called
>> before current trigger).

> -1

> building dynamic used array, that should or should not used can
> significantly decrease performance :(

I agree it wouldn't do to add cycles to every trigger for a feature that
only a small minority of them would use. However, maybe we could expose
something like this as a function you'd call to get the information if
you want it, with nil-or-close-to-nil overhead if you don't.

In the long run, maybe some of the lesser-used existing trigger
variables should be converted to that style too ...

regards, tom lane