Re: [HACKERS] Partition-wise aggregation/grouping

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От Jeevan Chalke
Тема Re: [HACKERS] Partition-wise aggregation/grouping
Дата
Msg-id CAM2+6=UB5i5wtW-gFvLbJ1P7YUMO7NZdXUTK89EFaUH3sSqu-g@mail.gmail.com
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Ответ на Re: [HACKERS] Partition-wise aggregation/grouping  (Dilip Kumar <dilipbalaut@gmail.com>)
Ответы Re: [HACKERS] Partition-wise aggregation/grouping  (Dilip Kumar <dilipbalaut@gmail.com>)
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On Tue, Oct 17, 2017 at 7:13 PM, Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Fri, Oct 13, 2017 at 12:06 PM, Jeevan Chalke
<jeevan.chalke@enterprisedb.com> wrote:
>
While playing around with the patch I have noticed one regression with
the partial partition-wise aggregate.

I am consistently able to reproduce this on my local machine.

Scenario: Group by on non-key column and only one tuple per group.

I didn't get what you mean by regression here. Can you please explain?

I see that PWA plan is selected over regular plan when enabled on the basis of costing.
Regular planning need a Result node due to which costing increases where as PWA don't need that and thus wins.


--
Jeevan Chalke
Technical Architect, Product Development
EnterpriseDB Corporation
The Enterprise PostgreSQL Company

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