Daniel Farina <drfar...@acm.org> writes: > Here are some weaknesses in the SUM aggregate that run up against the > type system. Maybe they'll help crystallize some discussion:
> SUM(int2) => int4 > SUM(int4) => int8 > SUM(int8) => numeric > Some weaknesses: > SUM, of any precision, assumes that the precision being accumulated > into (which is also the return-precision) is enough to avoid overflow. This is not a flaw of the type system, it's just an implementation choice in the SUM() aggregates. We could easily have chosen wider accumulation and/or result types. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers