Hash Semi Join 5,000-50,000x slower on PG18 vs PG17 with 10+ equality columns and NULL values (identical plan, no spill)

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1 patchset tracked - current t253261_3

v3t253261_3posted Jul 31, 05:24successwon't retryrecent 23dpg 20
base00b3e5005 Jul 31, 04:28 on master
applyapplied Jul 31, 05:25
rebaselast tried Jul 31, 05:25 on 00b3e5005
pushJul 31, 05:25 -> 394ed0e73branchdiff vs base
ResultAttPGTestsBuild / testImageWhen
success1201016 / 10162m 58s / 5m 42sdocker run ... :t253261Jul 31, 05:36
run 30606761088
executed 1016 - ccache 166 hit / 6452 miss - head 394ed0e73 - digest sha256:5f9689aba3151d... - run 30606761088