Horton

Re: [HACKERS] Custom compression methods

Tomas Vondra <tomas.vondra@2ndquadrant.com>

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From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Alexander Korotkov <a.korotkov@postgrespro.ru>, David Steele <david@pgmasters.net>, Ildus Kurbangaliev <i.kurbangaliev@gmail.com>, Dmitry Dolgov <9erthalion6@gmail.com>, PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Date: 2020-10-28T19:01:21Z
Lists: pgsql-hackers 
On Wed, Oct 28, 2020 at 01:16:31PM +0530, Dilip Kumar wrote:
>>
>> ...
>>
>> I have added the next patch to support the compression options.  I am
>> storing the compression options only for the latest compression
>> method.  Basically, based on this design we would be able to support
>> the options which are used only for compressions.  As of now, the
>> compression option infrastructure is added and the compression options
>> for inbuilt method pglz and the external method zlib are added.  Next,
>> I will work on adding the options for the lz4 method.
>
>In the attached patch set I have also included the compression option
>support for lz4.  As of now, I have only supported the acceleration
>for LZ4_compress_fast.  There is also support for the dictionary-based
>compression but if we try to support that then we will need the
>dictionary for decompression also.  Since we are only keeping the
>options for the current compression methods, we can not support
>dictionary-based options as of now.
>

OK, thanks. Do you have any other plans to improve this patch series? I
plan to do some testing and review, but if you're likely to post another
version soon then I'd wait a bit.


regards

-- 
Tomas Vondra                  http://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.