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Re: array_agg() NULL Handling

From: "David E(dot) Wheeler" <david(at)kineticode(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: array_agg() NULL Handling
Date: 2010-09-01 17:16:05
Message-ID: 1CCE16A9-D6B8-4251-B388-1373AFB6D0C7@kineticode.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sep 1, 2010, at 10:12 AM, Tom Lane wrote:

> I think when that text was written, it was meant to imply "all the
> aggregates defined in SQL92".  There seems to be a lot of confusion
> in this thread about whether "standard" means "defined by SQL spec"
> or "built-in in Postgres".  Should we try to refine the wording to
> clarify that?

Yes please.

> Even more to the point, should we deliberately make this vaguer so that
> we aren't finding ourselves with obsolete text again and again?  You can
> bet that people adding new aggregates in the future aren't going to
> think to update this sentence, any more than happened with array_agg.

Perhaps “consult the docs for each aggregate to determine how it handles NULLs.”

Best,

David

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