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Re: Review: listagg aggregate

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: "David E(dot) Wheeler" <david(at)kineticode(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Scott Bailey <artacus(at)comcast(dot)net>, "pgsql-hackers(at)postgresql(dot)org Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Review: listagg aggregate
Date: 2010-01-26 14:15:35
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Lists: pgsql-hackers
On Tue, Jan 26, 2010 at 2:14 AM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
> 2010/1/25 Robert Haas <robertmhaas(at)gmail(dot)com>:
>> On Mon, Jan 25, 2010 at 2:27 PM, David E. Wheeler <david(at)kineticode(dot)com> wrote:
>>> On Jan 25, 2010, at 2:09 AM, Peter Eisentraut wrote:
>>>> xmlagg -> concatenates values to form xml datum
>>>> array_agg -> concatenates values to form array datum
>>>> ??? -> concatenates values to form string datum
>>> concat_agg().
>> I like that one...
> why is concat_agg better than listagg ?

Because it doesn't make lists.

Honestly, I don't love concat_agg() either - why should something need
to have agg in the name just because it's an aggregate?  I think the
most descriptive name would be something like
concatenate_with_separator(), but that's kind of long.


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