Peter Eisentraut <[EMAIL PROTECTED]> writes:
> The function current_setting returns 'unset' if a parameter is not set.  
> Should it not return null?  This is not documented, so I guess this just 
> arose out of the implementation, or is this intentional?

That's because SHOW does the same thing.  SHOW has a little problem in
that it can't readily show the difference between "null" and an empty
string, so while I find the behavior pretty ugly, I don't have a better
idea.

The question thus is do you want the function behaving differently from
SHOW.  Returning NULL is probably better from a programming point of
view, but it'd be inconsistent with the command.

                        regards, tom lane

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