Luca Ferrari <fluca1978@gmail.com> writes:
> I've two main doubts:
> - is fmgr working for non PL functions? Because I cannot see messages
> starting when an internal function is invoked;
Built-in functions do not support fmgr_hook; see the order of tests
in fmgr_info_cxt_security(). I'd be loath to change that, for both
performance and risk-of-circularity reasons.
Note that built-in is not the same as internal --- you could potentially
make a new internal-language pg_proc entry pointing at some existing
built-in function, and then calls using that could get hooked.
regards, tom lane