Re: [PATCH] Enforce that INSERT...RETURNING preserves the order of multi rows

2012/10/21 Albert Cervera i Areny <albert(at)nan-tic(dot)com>:
> A Dimecres, 17 d'octubre de 2012 19:13:47, Merlin Moncure va escriure:
>
>> On Wed, Oct 17, 2012 at 9:29 AM, Peter Geoghegan <peter(at)2ndquadrant(dot)com>
>> wrote:
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>> > On 17 October 2012 14:53, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
>
>> >> Is that defined in the standard?
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>> >
>
>> > RETURNING isn't even defined in the standard.
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>>
>
>> Right: Point being, assumptions based on implementation ordering are
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>> generally to be avoided unless they are explicitly defined in the
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>> standard or elsewhere.
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>
>
> I don't see how one could use RETURNING if result is not ensured to be in
> the same order as the tuples supplied. What's the use of RETURNING supplying
> data in random order?

you don't need a ORDER, you need data - and if you need a order, then
you can use CTE and ORDER BY clause.

Proposed feature can be too limited in future - when some better
partitioning can be used or when paralel query processing will be
supported

Pavel

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