Horton

Re: Extended Statistics set/restore/clear functions.

Corey Huinker <corey.huinker@gmail.com>

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From: Corey Huinker <corey.huinker@gmail.com>
To: jian he <jian.universality@gmail.com>
Cc: Tomas Vondra <tomas@vondra.me>, pgsql-hackers@lists.postgresql.org, tgl@sss.pgh.pa.us
Date: 2025-08-12T17:28:14Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add test doing some cloning of extended statistics data

  2. Add test for pg_restore_extended_stats() with multiranges

  3. Add support for "mcv" in pg_restore_extended_stats()

  4. Include extended statistics data in pg_dump

  5. Add support for "dependencies" in pg_restore_extended_stats()

  6. Add test for MAINTAIN permission with pg_restore_extended_stats()

  7. Add pg_restore_extended_stats()

  8. Add routine to free MCVList

  9. Improve pg_clear_extended_stats() with incorrect relation/stats combination

  10. Add pg_clear_extended_stats()

  11. Introduce routines to validate and free MVNDistinct and MVDependencies

  12. Fix typo in stat_utils.c

  13. Move attribute statistics functions to stat_utils.c

  14. Improve error messages of input functions for pg_dependencies and pg_ndistinct

  15. Improve test output of extended statistics for ndistinct and dependencies

  16. Fix some compiler warnings

  17. Add input function for data type pg_dependencies

  18. Add input function for data type pg_ndistinct

  19. Rework output format of pg_dependencies

  20. Rework output format of pg_ndistinct

  21. Fix comments of output routines for pg_ndistinct and pg_dependencies

  22. Move code specific to pg_dependencies to new file

  23. Move code specific to pg_ndistinct to new file

  24. Document some structures in attribute_stats.c

  25. Fix FATAL message for invalid recovery timeline at beginning of recovery

Attachments

On Sat, Jun 21, 2025 at 8:12 PM Corey Huinker <corey.huinker@gmail.com>
wrote:

>
>> Any thoughts on using/improving these structures?
>>
>
> Hearing no objections, here is the latest patchset.
>
> 0001 - Changes input/output functions of pg_ndistinct to the format
> described earlier.
> 0002 - Changes input/output functions of pg_dependencies to the format
> described earlier.
> 0003 - Makes some previously internal/static attribute stats functions
> visible to extended_stats.c, because the exprs attribute is basically an
> array of partially filled-out pg_statistic rows.
> 0004 - Adds pg_restore_attribute_stats(), pg_clear_attribute_stats(), in
> the pattern of their relation/attribute brethren.
> 0005 - adds the dumping and restoring of extended statistics back to v10.
> No command line flag changes needed.
>
>

Rebased. Enjoy.