I wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> Barring screams of agony^W^W^Whelpful suggestions for how to code this
>> more neatly, I'll go ahead and commit this.
> The show_hook sucks, and is unnecessary, as is exposing the format
> function. Just set the GUC variable to the correct value.
Um: that was probably too brief. "Just set" means "use SetConfigOption".
As penance, I've committed the corrected patch.
regards, tom lane