Re: Optimizer in 7.1.1 worse thatn 7.0.3

pgsql-bugs@postgresql.org writes:
> I am hoping that there is a simple omission that keeps the optimizer
> from using the transitive literal.

PG doesn't compute transitive equality of literals, and never has AFAIK
(certainly 7.0.* didn't).  I'm not sure what's causing the change in
behavior from 7.0 to 7.1, but your theory about it is wrong.  Could you
make up a self-contained example?

			regards, tom lane