Re: ON EMPTY clause for aggregate and window functions

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Jeevan Chalke <jeevan(dot)chalke(at)enterprisedb(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Vik Fearing <vik(at)postgresfriends(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Isaac Morland <isaac(dot)morland(at)gmail(dot)com>
Subject: Re: ON EMPTY clause for aggregate and window functions
Date: 2026-09-28 17:36:47
Message-ID: CA+TgmoY2feo+4pbB6C84WPWOgv1Cfk8Y5sWfb=pi3jm4dm2COA@mail.gmail.com
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On Thu, Sep 24, 2026 at 9:18 AM Jeevan Chalke <
jeevan(dot)chalke(at)enterprisedb(dot)com> wrote:

> It only accepts ON EMPTY on sum() and product(), the two aggregates the
> standard actually defines this for. At parse time, once we know the
> call is sum() or product(), it is just rewritten to
> COALESCE(sum(expr), default). Nothing else changes:
>

I can't get excited about supporting this syntax for just 2 aggregates and
nothing else.

--
Robert Haas

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