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From: Amit Langote <[email protected]>
To: Bruce Momjian <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Jonathan S. Katz <[email protected]>
Cc: [email protected]
Subject: Re: PostgreSQL 12: Feature Highlights
Date: Tue, 21 May 2019 09:47:54 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 2019/05/18 0:36, Bruce Momjian wrote:
> On Fri, May 17, 2019 at 07:56:55PM +0900, Amit Langote wrote:
>> I agree that the current description captures at a high level the many
>> changes that made it possible.  Although, a couple of commits listed with
>> this item don't have much to do with that description, AFAICT.  Especially
>> 959d00e9d [1], which taught the planner to leverage the ordering imposed
>> on partitions by range partitioning.  With that commit, getting ordered
>> output from partitioned tables is now much quicker, especially with a
>> LIMIT clause.  You can tell that it sounds clearly unrelated to the
>> description we have now, which is "processing thousands of partitions is
> 
> Yes, it does.  I added this text and moved the commit item:
> 
>         Avoid sorting when partitions are already being scanned in the
>         necessary order (David Rowley)

Thank you Bruce.

Regards,
Amit

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