acamari(at)verlet(dot)org writes:
> user defined-aggregated don't set initcond to null when unspecified, instead
> uses its first argument.
And your point is?
AFAICS this is the documented behavior when the transition function
is strict. See
http://www.postgresql.org/docs/9.1/static/sql-createaggregate.html
6th paragraph under "Description".
regards, tom lane