Horton

Re: [HACKERS] Custom compression methods

Ildus Kurbangaliev <i.kurbangaliev@postgrespro.ru>

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From: Ildus Kurbangaliev <i.kurbangaliev@postgrespro.ru>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>, pgsql-hackers@postgresql.org, Ildar Musin <i.musin@postgrespro.ru>
Date: 2017-12-01T21:55:52Z
Lists: pgsql-hackers 
On Fri, 1 Dec 2017 16:38:42 -0300
Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:

> 
> To me it makes sense to say "let's create this method which is for
> data compression" (CREATE ACCESS METHOD hyperz TYPE COMPRESSION)
> followed by either "let's use this new compression method for the
> type tsvector" (ALTER TYPE tsvector SET COMPRESSION hyperz) or "let's
> use this new compression method for the column tc" (ALTER TABLE ALTER
> COLUMN tc SET COMPRESSION hyperz).
> 

Hi, I think if CREATE ACCESS METHOD can be used for compression, then it
could be nicer than CREATE COMPRESSION METHOD. I just don't
know that compression could go as access method or not. Anyway
it's easy to change syntax and I don't mind to do it, if it will be
neccessary for the patch to be commited.

-- 
----
Regards,
Ildus Kurbangaliev

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.