"Sergey E. Koposov" <math@sai.msu.ru> writes:
> Will it be enough to provide the testcase for just that 'expain UPDATE' ?
Whatever makes it crash ;-)
My guess is that there's some rewriter interaction involved, which means
that the rule itself is part of the problem --- you'll likely not be
able to duplicate it without a similar rule.
regards, tom lane
