Hi!
During testing of 8.1 I found that using pg_dumpall (-g) against a live
8.0 install that has at least one GROUP defined results in the following
warning while it creates the CREATE ROLE statements in the dump:
row number 0 is out of range 0..-1
To reproduce the problem it is enough to init a new 8.0 cluster, create
a empty GROUP and dump the cluster using pg_dumpall from -HEAD(or beta1).
Stefan