| From: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
|---|---|
| To: | "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>, David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, Zhihong Yu <zyu(at)yugabyte(dot)com>, "Andrey V(dot) Lepikhov" <a(dot)lepikhov(at)postgrespro(dot)ru>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: POC: GROUP BY optimization |
| Date: | 2022-09-04 22:14:48 |
| Message-ID: | 2d5d480b-d9e5-9d8f-dbca-ad6ec22a1b75@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 9/1/22 16:05, Jonathan S. Katz wrote:
> On 9/1/22 9:06 AM, Tomas Vondra wrote:
>>
>>
>> On 8/30/22 15:15, Jonathan S. Katz wrote:
>>> On 8/18/22 3:29 AM, Tomas Vondra wrote:
>>>>
>>>>
>>>> On 8/18/22 03:32, David Rowley wrote:
>>>
>>>>> Here are a couple of patches to demo the idea.
>>>>>
>>>>
>>>> Yeah, that's an option too. I should have mentioned it along with the
>>>> cpu_operator_cost.
>>>>
>>>> BTW would you mind taking a look at the costing? I think it's fine, but
>>>> it would be good if someone not involved in the patch takes a look.
>>>
>>> With RMT hat on, just a friendly reminder that this is still on the open
>>> items list[1] -- we have the Beta 4 release next week and it would be
>>> great if we can get this resolved prior to it.
>>>
>>
>> I know. I'll fix this by tweaking one of the cost gucs, mentioned by
>> David.
>
> Great -- thanks for the update!
>
I've pushed the fix to 15+master. In the end I just used David's patches
that set parallel_setup_cost to 0.
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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