Lazy LEFT NestLoop JOIN: gate rescanning of the inner side by outer-side-only join clauses

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ID 6981
Title Lazy LEFT NestLoop JOIN: gate rescanning of the inner side by outer-side-only join clauses
CI (CFBot) Summary
Stats (from CFBot) Patch version: v1, Patch count: 2, First patch: +459−252, All patches: +469−252
Tags Performance
Created 2026-07-03 12:56:30
Last modified 2026-07-03 12:59:12 (2 hours ago)
Latest email 2026-07-03 10:53:11 (4 hours ago)
Status
PG20-2 (2026-09-01 – 2026-09-30): Needs review
Target version 20
Authors Andrei Lepikhov (lepikhov), Mikhail Zhilin (mizhka-at-pgpro), Peter Petrov (pspetrov)
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Do not scan index in right table if condition for left join evaluates to false using columns in left table
First at 2024-12-07 18:30:46 by Илья Жарков <izharkov1243 at gmail.com>
Latest at 2026-07-03 10:53:11 by Andrei Lepikhov <lepihov at gmail.com>
Latest attachment (v1-0001-Gate-the-NestLoop-inner-side-with-outer-only-join.patch) at 2026-07-03 10:53:11 from Andrei Lepikhov <lepihov at gmail.com>
    Attachment (v1-0001-Gate-the-NestLoop-inner-side-with-outer-only-join.patch) at 2026-07-03 10:53:11 from Andrei Lepikhov <lepihov at gmail.com> (Patch: Yes)
    Attachment (v0-0001-Gate-the-NestLoop-inner-side-with-outer-only-join.patch) at 2026-06-30 08:20:52 from Andrei Lepikhov <lepihov at gmail.com> (Patch: Yes)
    Attachment (0001-Gate-the-NestLoop-inner-side-with-outer-only-join-cl.patch) at 2026-05-27 10:11:17 from Andrei Lepikhov <lepihov at gmail.com> (Patch: Yes)
    Attachment (reproduction.sql) at 2024-12-16 09:58:52 from eng eng <pspetrov91 at gmail.com> (Patch: No)
    Attachment (reproduction.sql) at 2024-12-08 02:23:42 from Andrei Lepikhov <lepihov at gmail.com> (Patch: No)
History
When Who What
2026-07-03 12:59:12 Andrei Lepikhov (lepikhov) Changed authors to Andrei Lepikhov (lepikhov), Mikhail Zhilin (mizhka-at-pgpro), Peter Petrov (pspetrov)
2026-07-03 12:59:12 Andrei Lepikhov (lepikhov) Changed name to Lazy LEFT NestLoop JOIN: gate rescanning of the inner side by outer-side-only join clauses
2026-07-03 12:56:31 Andrei Lepikhov (lepikhov) Attached mail thread CAKE=rqQ-LHuh2eVsKC7ihkRJoCBZafSR72o3Xk4Xb=LcQMQfsA@mail.gmail.com
2026-07-03 12:56:30 Andrei Lepikhov (lepikhov) Created patch record
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