Re: 2019-03 CF Summary / Review - Tranche #2

From: Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>
To: "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>, "'Andres Freund'" <andres(at)anarazel(dot)de>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: 2019-03 CF Summary / Review - Tranche #2
Date: 2019-02-18 02:49:31
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On 2019/02/18 11:13, Tsunakawa, Takayuki wrote:
> From: Andres Freund [mailto:andres(at)anarazel(dot)de]
>> - Speed up planning with partitions
>> NR: Important feature, but based on a skim of the discussion this
>> doesn't seem ready for v12.
>> Andres: punt to v13
>> - Speed up transaction completion faster after many relations are
>> accessed in a transaction
>> NR: This has only been submitted 2019-02-12. While not a really
>> complicated patch, it's also not trivial. Therefore I'd say this falls
>> under our policy of not merging nontrivial patches first submitted to
>> the last CF.
>> Andres: punt to v13
> I hope these will be continued in PG 12, because these will make PostgreSQL comparable to a commercial database in OLTP workloads. I'd like to hear from Amit and David on the feasibility.

As far as the first one is concerned (speed up planning with partitions),
although there's no new functionality [1], there is quite a bit of code
churn affecting somewhat complex logic of inheritance planning. As I
mentioned in the FOSDEM developer meeting's patch triage discussion,
there's a chance of moving this forward if Tom has time to look at some
portions of these patches. David's and Imai-san's review over the past
few months has been very helpful to get the patches to the state they are
in now.

As for the 2nd one, while I can say it's really helpful for workloads with
many partitions, I have to admit I can't give an expert opinion on the
code changes. Thank you for working on it.


[1] it does enable hash partition pruning for update/delete queries
though, which is a new feature

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