Postgresql 9.4: How to find out the stack level of nested function Here are the two cases:


Function fA fetches some rows and returns a table
Function fB calls function fA and returns a table


Within fA, how could I know whether it's been called from the program or by fB? 

Is there some @@nestlevel that can count how deep in the stack are the functions running?

Big thank you in advance,
There's a different, simpler, solution for this. Add an argument to function fA with a default value, for instance: called_from_b BOOLEAN DEFAULT FALSE. Then, provide that argument when calling fA from fB.

I understand that this doesn't directly answer your question, but it does provide a solution for the example usecase that you provide.