Horton

pg_plan_advice: Fix another unique-semijoin bug.

Robert Haas <rhaas@postgresql.org>

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Commit: 4321dcad475bc7cbb4efe18c0b0652a0506e8348
Author: Robert Haas <rhaas@postgresql.org>
Date: 2026-04-17T18:08:37Z
Releases: 19 (unreleased) 
pg_plan_advice: Fix another unique-semijoin bug.

This one occurs when an outer join appears beneath the made-unique
side of a semijoin. The issue is that join RTEs are not featured
out of sj_unique_rels entries. Fix, and add a test case.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Analyzed-by: Tender Wang <tndrwang@gmail.com>
Discussion: http://postgr.es/m/c0c63979-43c2-4424-8fe8-56949934c9d8@gmail.com

Files

PathChange+/−
contrib/pg_plan_advice/expected/semijoin.out modified +32 −0
contrib/pg_plan_advice/pgpa_planner.c modified +11 −2
contrib/pg_plan_advice/sql/semijoin.sql modified +9 −0

Discussion