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Re: pg_plan_advice

David G. Johnston <david.g.johnston@gmail.com>

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From: "David G. Johnston" <david.g.johnston@gmail.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Alexandra Wang <alexandra.wang.oss@gmail.com>, Richard Guo <guofenglinux@gmail.com>, Lukas Fittl <lukas@fittl.com>, Tom Lane <tgl@sss.pgh.pa.us>, Jacob Champion <jacob.champion@enterprisedb.com>, Dian Fay <di@nmfay.com>, Matheus Alcantara <matheusssilv97@gmail.com>, Jakub Wartak <jakub.wartak@enterprisedb.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2026-03-02T22:09:12Z
Lists: pgsql-hackers

Attachments

On Sun, Mar 1, 2026 at 9:10 PM David G. Johnston <david.g.johnston@gmail.com>
wrote:

> On Fri, Feb 27, 2026 at 6:16 PM David G. Johnston <
> david.g.johnston@gmail.com> wrote:
>
>> On Fri, Feb 27, 2026 at 3:46 PM Robert Haas <robertmhaas@gmail.com>
>> wrote:
>>
>>> On Thu, Feb 26, 2026 at 8:55 AM Robert Haas <robertmhaas@gmail.com>
>>> wrote:
>>> > Thanks, Alex, for the review.
>>>
>>> Here's v18. In addition to fixing the problems pointed out by Alex,
>>> there are a couple of significant changes in this version.
>>>
>>>
>> I have a mind to walk through the readmes and sgmls but its going to be
>> in chunks.  Here's one for the readme for pg_plan_advice with a couple of
>> preliminary sgml changes.
>>
>>
> 0003 sgml focus with some readme.
>
>
And now 0004 sgml (no readme):

My OCD wants these named pg_advice_{plan,collect,stash} so they sort
together.

Strongly thinking using "entries" throughout makes more sense than "query
texts and advice string" - it is shorter and more inclusive since the
actual stored info covers IDs and timestamp.

I made one swap where shared was being mentioned before local.

I added some unresearched answers to open questions I had at the end of the
main section.  Namely, pertaining to advice feedback output and capturing
explain plans themselves.

David J.

Commits

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

  1. pg_plan_advice: Fix another unique-semijoin bug.

  2. pg_plan_advice: Export feedback-related definitions.

  3. pg_plan_advice: Fix a bug when a subquery is pruned away entirely.

  4. pg_plan_advice: Add alternatives test to Makefile.

  5. pg_plan_advice: Handle non-repeatable TABLESAMPLE scans.

  6. pg_stash_advice: Allow stashed advice to be persisted to disk.

  7. Add pg_stash_advice contrib module.

  8. pg_plan_advice: Avoid assertion failure with partitionwise aggregate.

  9. pg_plan_advice: Invent DO_NOT_SCAN(relation_identifier).

  10. Add an alternative_plan_name field to PlannerInfo.

  11. pg_plan_advice: Refactor to invent pgpa_planner_info

  12. Respect disabled_nodes in fix_alternative_subplan.

  13. get_memoize_path: Don't exit quickly when PGS_NESTLOOP_PLAIN is unset.

  14. test_plan_advice: Set TAP test priority 50 in meson.build.

  15. pg_plan_advice: Avoid a crash under GEQO.

  16. Test pg_plan_advice using a new test_plan_advice module.

  17. pg_plan_advice: Always install pg_plan_advice.h, and in the right place

  18. pg_plan_advice: Fix failures to accept identifier keywords.

  19. Add pg_plan_advice contrib module.

  20. Allow extensions to mark an individual index as disabled.

  21. Replace get_relation_info_hook with build_simple_rel_hook.

  22. Store information about Append node consolidation in the final plan.

  23. Store information about elided nodes in the final plan.

  24. Store information about range-table flattening in the final plan.

  25. Pass cursorOptions to planner_setup_hook.

  26. Fix PGS_CONSIDER_NONPARTIAL interaction with Materialize nodes.

  27. Fix mistakes in commit 4020b370f214315b8c10430301898ac21658143f

  28. Allow for plugin control over path generation strategies.

  29. Update some comments for fasthash

  30. Allow passing a pointer to GetNamedDSMSegment()'s init callback.

  31. Don't reset the pathlist of partitioned joinrels.

  32. Treat number of disabled nodes in a path as a separate cost metric.