Yury Bokhoncovich <byg@center-f1.ru> writes:
> Does anybody know a reason parse_datestyle_internal always returns TRUE?
Ancient history. Before GUC there were lots more routines and a lot
of control structure in variable.c; the return value of the parse/set
functions was used for something or other. The stuff remaining in
variable.c isn't yet merged into the GUC mechanism ... but it should be.
regards, tom lane