>>>>> "Heikki" == Heikki Linnakangas <heikki.linnakan...@enterprisedb.com> >>>>> writes:
>> No artificial restrictions are imposed on what syntactical >> combinations are allowed. However, ORDER BY is not allowed with >> aggregates used as window functions (as per the existing >> restriction on DISTINCT). Heikki> How is this different from window functions? Window functions return a row for each row of input, aggregates don't. The reason I didn't tackle the case of aggregate functions used as window functions is that the spec allows constructs like this: array_agg(a order by b) over (order by c) which can't be represented using the aggregate-as-window-function mechanism as it currently stands, since you'd have to re-sort the window each time. -- Andrew (irc:RhodiumToad) -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
