Re: PostgreSQL 12: Feature Highlights

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