Horton

Re: Custom compression methods

Oleg Bartunov <obartunov@gmail.com>

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From: Oleg Bartunov <obartunov@gmail.com>
To: Craig Ringer <craig@2ndquadrant.com>
Cc: Ildus Kurbangaliev <i.kurbangaliev@postgrespro.ru>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Andres Freund <andres@anarazel.de>
Date: 2017-11-05T19:22:53Z
Lists: pgsql-hackers 
On Thu, Nov 2, 2017 at 6:02 PM, Craig Ringer <craig@2ndquadrant.com> wrote:
> On 2 November 2017 at 17:41, Ildus Kurbangaliev
> <i.kurbangaliev@postgrespro.ru> wrote:
>
>> In this patch compression methods is suitable for MAIN and EXTENDED
>> storages like in current implementation in postgres. Just instead only
>> of LZ4 you can specify any other compression method.
>
> We've had this discussion before.
>
> Please read the "pluggable compression support" thread. See you in a
> few days ;) sorry, it's kinda long.
>
> https://www.postgresql.org/message-id/flat/20130621000900.GA12425%40alap2.anarazel.de#20130621000900.GA12425@alap2.anarazel.de
>

the proposed patch provides "pluggable" compression and let's user
decide by their own which algorithm to use.
The postgres core doesn't responsible for any patent problem.


> IIRC there were some concerns about what happened with pg_upgrade,
> with consuming precious toast bits, and a few other things.

yes, pg_upgrade may be a problem.

>
> --
>  Craig Ringer                   http://www.2ndQuadrant.com/
>  PostgreSQL Development, 24x7 Support, Training & Services
>
>
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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.