Horton

Re: PG 13 release notes, first draft

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Peter Geoghegan <pg@bowt.ie>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2020-05-12T01:23:30Z
Lists: pgsql-hackers 
On Mon, May 11, 2020 at 09:15:43PM -0400, Bruce Momjian wrote:
> On Mon, May 11, 2020 at 05:33:40PM -0700, Peter Geoghegan wrote:
> > On Mon, May 11, 2020 at 5:14 PM Bruce Momjian <bruce@momjian.us> wrote:
> > > Agreed.  How is this?
> > >
> > >         This allows efficient btree indexing of low cardinality columns.
> > >         Users upgrading with pg_upgrade will need to use REINDEX to make use of
> > >         this feature.
> > 
> > I still think that the release notes should say that the key is only
> > stored once, while TIDs that identify table rows are stored together
> > as an array. Everything that's helpful (or harmful) about the feature
> > happens as a consequence of that. This isn't hard to grasp
> > intuitively, and is totally in line with how things like Oracle bitmap
> > indexes are presented to ordinary users.
> 
> I still don't think these details belong in the release notes.

OK, I was able to add some of it cleanly:

	This allows efficient btree indexing of low cardinality columns by
	storing duplicate keys only once.  Users upgrading with pg_upgrade
	will need to use REINDEX to make use of this feature.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +

Commits

  1. Doc: improve release notes' info about FROM UNPACKAGED feature removal.

  2. Doc: fix misstatement in v13 release notes.

  3. Doc: some more v13 release note tweaking.

  4. Doc: update v13 release notes through today, do a copy-editing pass.

  5. Doc: fill in "major enhancements" list in v13 release notes.

  6. doc: PG 13 relnotes: fix typos

  7. doc: PG 13 relnotes, update TOAST item to mention decompression

  8. pgbench: document that the default data loading is client-side

  9. psql \d: Display table where trigger is defined, if inherited

  10. Skip WAL for new relfilenodes, under wal_level=minimal.

  11. Introduce vacuum errcontext to display additional information.

  12. Fix lquery's behavior for consecutive '*' items.

  13. Improve the internal implementation of ereport().

  14. Add object names to partition integrity violations.

  15. Allow page lock to conflict among parallel group members.

  16. Allow relation extension lock to conflict among parallel group members.

  17. Introduce "anycompatible" family of polymorphic types.

  18. Improve checking of child pages in contrib/amcheck.

  19. doc: Add information about new SQL part SQL/MDA

  20. Added relation name in error messages for constraint checks.

  21. Avoid full scan of GIN indexes when possible

  22. Use carriage returns for data insertion logs in pgbench on terminal

  23. Use memcpy instead of a byte loop in pglz_decompress

  24. Add backtrace support for error reporting

  25. Improve pruning of a default partition

  26. Improve psql's \d output for partitioned indexes.

  27. initdb: Change authentication defaults