Re: Aggregate ORDER BY patch

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Aggregate ORDER BY patch
Date: 2009-11-13 11:36:43
Message-ID: 1258112203.7053.23.camel@fsopti579.F-Secure.com
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On fre, 2009-11-13 at 03:16 +0000, Andrew Gierth wrote:
> Caveat: as discussed earlier, this patch changes the behaviour of
> array_agg(DISTINCT x) when applied to NULL inputs. Formerly, the NULLs
> were unconditionally skipped; now, they are treated just like DISTINCT
> or GROUP BY normally do.

The right answer to that should be in the SQL standard.

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