Horton

Re: Postgres 11 release notes

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Đặng Minh Hướng <kakalot49@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2018-05-14T20:28:50Z
Lists: pgsql-hackers 
On Sun, May 13, 2018 at 05:43:25PM +0900, Đặng Minh Hướng wrote:
> Hello Bruce,
> 
> Thanks for the greate work!
> 
> 2018-05-12 0:08 GMT+09:00 Bruce Momjian <bruce@momjian.us>:
> 
>     I have committed the first draft of the Postgres 11 release notes.  I
>     will add more markup soon.  You can view the most current version here:
> 
>             http://momjian.us/pgsql_docs/release-11.html
> 
>     I expect a torrent of feedback.  ;-)
> 
> 
> I think the behavior change (from PostgreSQL 11) of power() with NaN below also
> need to report to users as the major change.
> 
> related commit: 61b200e2f582d0886d9de947e182483339d881fd
>                           6bdf1303b34bc630e8945ae3407ec7e8395c8fe5
>                 
> Discussion: https://postgr.es/m/
> 75DB81BEEA95B445AE6D576A0A5C9E936A73E741@BPXM05GP.gisp.nec.co.jp

Wow, that is an interesting case.  The patch was applied to head and
backbranches, (so I didn't see it) but three days later reverted in back
branches, and after my date cut-off:

	commit f74d83b3034f830bd68489b4aba99a4dee29c565
	Author: Tom Lane <tgl@sss.pgh.pa.us>
	Date:   Wed May 2 17:32:40 2018 -0400
	
	    Revert back-branch changes in power()'s behavior for NaN inputs.
	
	    Per discussion, the value of fixing these bugs in the back branches
	    doesn't outweigh the downsides of changing corner-case behavior in
	    a minor release.  Hence, revert commits 217d8f3a1 and 4d864de48 in
	    the v10 branch and the corresponding commits in 9.3-9.6.
	
	    Discussion: https://postgr.es/m/75DB81BEEA95B445AE6D576A0A5C9E936A73E741@BPXM05GP.gisp.nec.co.jp

Added:

        Consistently return <literal>NaN</literal> for
        <literal>NaN</literal> inputs to <function>power()</literal>
        on older platforms (Dang Minh Huong)

-- 
  Bruce Momjian  <bruce@momjian.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 +

Commits

  1. doc: update PG 11 release notes

  2. Fix misspelled pg_trgm contrib name in PostgreSQL 11 release notes

  3. Doc: clarify release note text about v11's new window function features.

  4. Improve wording of release notes item

  5. Fix typos in release notes

  6. Doc: preliminary list of PG11 major features.

  7. Make numeric power() handle NaNs according to the modern POSIX spec.

  8. Various improvements of skipping index scan during vacuum technics

  9. Revert back-branch changes in power()'s behavior for NaN inputs.

  10. Avoid wrong results for power() with NaN input on more platforms.

  11. Avoid wrong results for power() with NaN input on some platforms.

  12. Skip full index scan during cleanup of B-tree indexes when possible

  13. Rewrite the code that applies scan/join targets to paths.

  14. Postpone generate_gather_paths for topmost scan/join rel.

  15. Add casts from jsonb

  16. Make plpgsql use its DTYPE_REC code paths for composite-type variables.

  17. Don't allow VACUUM VERBOSE ANALYZE VERBOSE.

  18. Pass InitPlan values to workers via Gather (Merge).

  19. Account for the effect of lossy pages when costing bitmap scans.

  20. Allow no-op GiST support functions to be omitted.

  21. Rearm statement_timeout after each executed query.

  22. Push limit through subqueries to underlying sort, where possible.