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: Tomas Vondra <tomas@vondra.me>
Cc: pgsql-hackers@lists.postgresql.org
Date: 2025-01-24T00:06:48Z
Lists: pgsql-hackers

Commits

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  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

>
> I see there's a couple MCV-specific functions in the extended_stats.c.
>> Shouldn't those go into mvc.c instead?
>>
>
> I wanted to put it there, but there was a reason I didn't and I've now
> forgotten what it was. I'll make an effort to relocate it to mcv.c.
>

Looking at it now, I see that check_mcvlist_array() expects access to
extarginfo, so I either I add a bunch of Datum-aware and extarginfo-aware
code to mcv.c, or I do those checks outside of import_mcvlist() and leave
check_mcvlist_array() where it is, which is my current inclination, though
obviously it's not a perfectly clean break.