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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: jian he <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: First draft of PG 17 release notes
Date: Thu, 9 May 2024 11:08:34 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CACJufxG_1=aRBHEvfGUjgjs_KVmc6bBQdmSns8u0wEta-idy2Q@mail.gmail.com>
References: <[email protected]>
<CACJufxG_1=aRBHEvfGUjgjs_KVmc6bBQdmSns8u0wEta-idy2Q@mail.gmail.com>
On Thu, May 9, 2024 at 06:53:30PM +0800, jian he wrote:
> On Thu, May 9, 2024 at 12:04 PM Bruce Momjian <[email protected]> wrote:
> > I have committed the first draft of the PG 17 release notes; you can
> > see the results here:
> >
> > https://momjian.us/pgsql_docs/release-17.html
> >
>
> * Add function pg_buffercache_evict() to allow shared buffer eviction
> (Palak Chaturvedi, Thomas Munro)
> * This is useful for testing.
>
> this should put it on the section
> < E.1.3.11. Additional Modules
> ?
Oh, it is in the pg_buffercache module --- I should have realized that
from the name, fixed.
> Then I found out official release notes don't have <section> attributes,
> so it doesn't matter?
Uh, what are sections? Did previous release notes have it?
> I think this commit title "Add hash support functions and hash opclass
> for contrib/ltree."
> from [1] is more descriptive.
Uh, I don't think people know what hash support functions are, but they
know what hash indexes are, and maybe hash joins and hash aggregates.
Why do you consider the commit text better?
> i am not 100% sure of the meaning of "This is useful for extensions."
The commit says:
commit 2b5154beab7
Author: Tom Lane <[email protected]>
Date: Fri Oct 20 12:28:38 2023 -0400
Extend ALTER OPERATOR to allow setting more optimization attributes.
Allow the COMMUTATOR, NEGATOR, MERGES, and HASHES attributes to be set
by ALTER OPERATOR. However, we don't allow COMMUTATOR/NEGATOR to be
changed once set, nor allow the MERGES/HASHES flags to be unset once
set. Changes like that might invalidate plans already made, and
dealing with the consequences seems like more trouble than it's worth.
--> The main use-case we foresee for this is to allow addition of missed
--> properties in extension update scripts, such as extending an existing
--> operator to support hashing. So only transitions from not-set to set
states seem very useful.
--
Bruce Momjian <[email protected]> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.
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