Glen Parker <glenebob@nwlink.com> writes:
> Why would very large text values effect the speed of a seq scan that
> does not actually evaluate those values?
More bytes to scan over? Have you checked the physical table sizes?
I'd actually suppose it's the smaller values (up to a few hundred bytes)
that impact this the most. Really wide fields would be pushed
out-of-line.
regards, tom lane