Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> writes:
> So I think this is dead code. The attached patch removes it.
Yeah, it is dead code; it's a leftover from Vadim's old plan to implement
Oracle-style UNDO. AFAIK none of the current crop of hackers wants to
proceed in that direction, so we may as well remove the last traces.
regards, tom lane