Horton

Re: Removing unneeded self joins

Andrei Lepikhov <a.lepikhov@postgrespro.ru>

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From: Andrey Lepikhov <a.lepikhov@postgrespro.ru>
To: David Steele <david@pgmasters.net>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2020-04-03T04:43:41Z
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. Remove GUC_NOT_IN_SAMPLE from enable_self_join_elimination

  2. Put enable_self_join_elimination into postgresql.conf.sample

  3. Get rid of ojrelid local variable in remove_rel_from_query()

  4. Implement Self-Join Elimination

  5. Revert: Remove useless self-joins

  6. Replace lateral references to removed rels in subqueries

  7. Replace relids in lateral subquery parse tree during SJE

  8. Forbid SJE with result relation

  9. Fix misuse of RelOptInfo.unique_for_rels cache by SJE

  10. Replace the relid in some missing fields during SJE

  11. Revert 56-bit relfilenode change and follow-up commits.

  12. Stabilize timetz test across DST transitions.

  13. Speed up finding EquivalenceClasses for a given set of rels

  14. Fix mark-and-restore-skipping test case to not be a self-join.

Attachments

On 4/1/20 8:34 PM, David Steele wrote:
> This patch no longer applies cleanly on 
> src/test/regress/sql/equivclass.sql: 
> http://cfbot.cputube.org/patch_27_1712.log
> 
> The CF entry has been updated to Waiting on Author.

v.23 in attachment:

1. The patch applies cleanly.
2. Add checks: two potentially self joined relations may belong to 
different rules of order restriction in join_info_list.
3. Add test for item 2.

The CF entry has been updated to Needs review.

-- 
Andrey Lepikhov
Postgres Professional
https://postgrespro.com
The Russian Postgres Company