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Re: Review: listagg aggregate

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: Robert Haas <robertmhaas(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 14:56:07
Message-ID: 162867791001260656r12b23283xfeb61df6b2df56e2@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
2010/1/26 Robert Haas <robertmhaas(at)gmail(dot)com>:
> 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.

This is never ending story :)

MySQL has function concate_ws - but this function has different semantic.

I thing so string_agg is short, and from one view consistent

Pavel

>
> ...Robert
>

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