Peter Eisentraut <peter_e@gmx.net> writes:
> pei=# select castsource::regtype, casttarget::regtype, castcontext from pg_cast order by 1,2;
> ERROR: XX000: could not find pathkey item to sort
> LOCATION: make_sort_from_pathkeys, createplan.c:2812
Hmph. When we hacked that function last week, I was kinda wondering if
it shouldn't strip RelabelType from *both* sides of the comparison.
Looks like it does need that after all.
regards, tom lane