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Re: RFC: array_agg() per SQL:200n

From: Jeff Davis <pgsql(at)j-davis(dot)com>
To: Neil Conway <neilc(at)samurai(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: RFC: array_agg() per SQL:200n
Date: 2008-01-28 22:11:43
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Sun, 2008-01-27 at 22:11 -0800, Neil Conway wrote:
> p. 564 discusses the required behavior. The result of array_agg() is an
> array with one element per input value, sorted according to the optional
> ORDER BY clause. NULL input values are included in the array, and the
> result for an empty group is NULL, not an empty array. Note that per
> page 66, I'd expect array values in the input to array_agg() not to be
> flattened.

Should there be an inverse operator (a SRF, in this case) that returns a
set from an array?

	Jeff Davis

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