Horton

Re: [HACKERS] Custom compression methods

Alvaro Herrera <alvherre@2ndquadrant.com>

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From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Alexander Korotkov <a.korotkov@postgrespro.ru>
Cc: Thomas Munro <thomas.munro@gmail.com>, Ildus Kurbangaliev <i.kurbangaliev@gmail.com>, David Steele <david@pgmasters.net>, Dmitry Dolgov <9erthalion6@gmail.com>, PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Date: 2019-07-01T14:51:36Z
Lists: pgsql-hackers 
On 2019-Jul-01, Alexander Korotkov wrote:

> As I get we're currently need to make high-level decision of whether
> we need this [1].  I was going to bring this topic up at last PGCon,
> but I didn't manage to attend.  Does it worth bothering Ildus with
> continuous rebasing assuming we don't have this high-level decision
> yet?

I agree that having to constantly rebase a patch that doesn't get acted
upon is a bit pointless.  I see a bit of a process problem here: if the
patch doesn't apply, it gets punted out of commitfest and reviewers
don't look at it.  This means the discussion goes unseen and no
decisions are made.  My immediate suggestion is to rebase even if other
changes are needed.  Longer-term I think it'd be useful to have patches
marked as needing "high-level decisions" that may lag behind current
master; maybe we have them provide a git commit-ID on top of which the
patch applies cleanly.

I recently found git-imerge which can make rebasing of large patch
series easier, by letting you deal with smaller conflicts one step at a
time rather than one giant conflict; it may prove useful.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Commits

  1. docs: Update TOAST storage docs for configurable compression.

  2. Further tweaking of pg_dump's handling of default_toast_compression.

  3. Fix interaction of TOAST compression with expression indexes.

  4. Tidy up more loose ends related to configurable TOAST compression.

  5. Short-circuit slice requests that are for more than the object's size.

  6. Mostly-cosmetic adjustments of TOAST-related macros.

  7. Remove useless configure probe for <lz4/lz4.h>.

  8. Error on invalid TOAST compression in CREATE or ALTER TABLE.

  9. docs: Fix omissions related to configurable TOAST compression.

  10. More code cleanup for configurable TOAST compression.

  11. Bring configure support for LZ4 up to snuff.

  12. Make compression.sql regression test independent of default.

  13. Use valid compression method in brin_form_tuple

  14. Fix up pg_dump's handling of per-attribute compression options.

  15. Allow configurable LZ4 TOAST compression.

  16. Fix inconsistencies in the code

  17. Mostly-cosmetic improvements in memory chunk header alignment coding.

  18. Allow numeric to use a more compact, 2-byte header in many cases.