Re: more support for various frame types of window functions

From: Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
To: heikki(dot)linnakangas(at)enterprisedb(dot)com (Heikki Linnakangas), Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: more support for various frame types of window functions
Date: 2009-11-09 13:25:21
Message-ID: 877htzzvco.fsf@news-spur.riddles.org.uk
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>>>>> "Heikki" == Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:

Heikki> Yeah, we need the reinitialization support to handle the generic case.

Heikki> One idea is to take a copy of the state datum after each row.

Some existing aggregates, notably array_agg, rely on the assumption
that this never happens.

--
Andrew (irc:RhodiumToad)

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