From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
Cc: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Justin Clift <justin(at)postgresql(dot)org>, "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>, pgsql-advocacy(at)lists(dot)postgresql(dot)org |
Subject: | Re: PostgreSQL 12: Feature Highlights |
Date: | 2019-05-14 02:59:18 |
Message-ID: | 20190514025918.mqfedp3k625t5eoc@momjian.us |
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Lists: | pgsql-advocacy pgsql-hackers |
On Mon, May 13, 2019 at 10:50:59PM +1200, David Rowley wrote:
> On Mon, 13 May 2019 at 18:37, Amit Langote
> <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> > It's true that optimizer and executor can now handle larger number of
> > partitions efficiently, but the improvements in this release will only be
> > meaningful to workloads where partition pruning is crucial, so I don't see
> > why mentioning "pruning" is so misleading. Perhaps, it would be slightly
> > misleading to not mention it, because readers might think that queries
> > like this one:
> >
> > select count(*) from partitioned_table;
> >
> > are now faster in v12, whereas AFAIK, they perform perform more or less
> > the same as in v11.
>
> This is true, but whether partitions are pruned or not is only
> relevant to one of the many items the headline feature is talking
> about. I'm not sure how you'd briefly enough mention that fact without
> going into detail about which features are which and which are
> affected by partition pruning.
>
> I think these are the sorts of details that can be mentioned away from
> the headline features, which is why I think lumping these all in one
> in the main release notes is a bad idea as it's pretty hard to do that
> when they're all lumped in as one item.
I think the point is that partition pruning and tuple _routing_ to the
right partition is also improved. I updated the release note items to
say:
Tables with thousands of child partitions can now be processed
efficiently.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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