Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vbm4P-00CnSc-0n for pgsql-performance@arkaria.postgresql.org; Fri, 02 Jan 2026 20:48:26 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.96) (envelope-from ) id 1vbm4M-00BBrs-2v for pgsql-performance@arkaria.postgresql.org; Fri, 02 Jan 2026 20:48:23 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vbm2b-00B86E-0F for pgsql-performance@lists.postgresql.org; Fri, 02 Jan 2026 20:46:33 +0000 Received: from sss.pgh.pa.us ([68.162.161.243]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vbm2Z-0048YL-0h for pgsql-performance@postgresql.org; Fri, 02 Jan 2026 20:46:33 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.15.2/8.15.2) with ESMTP id 602KkT00267808; Fri, 2 Jan 2026 15:46:30 -0500 From: Tom Lane To: wotq cc: pgsql-performance@postgresql.org Subject: Re: Surprising optimizer behavior with a subquery, a GROUP BY, and a range filter In-reply-to: References: Comments: In-reply-to wotq message dated "Fri, 02 Jan 2026 14:26:55 -0600" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <267806.1767386789.1@sss.pgh.pa.us> Content-Transfer-Encoding: quoted-printable Date: Fri, 02 Jan 2026 15:46:29 -0500 Message-ID: <267807.1767386789@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk wotq writes: > The following query isn't optimized as I would expect: I don't see this misbehavior on HEAD or v18 branch tip. I suspect it was fixed last week by [1] and/or [2]. regards, tom lane [1] https://git.postgresql.org/gitweb/?p=3Dpostgresql.git&a=3Dcommitdiff&h= =3Dad66f705f [2] https://git.postgresql.org/gitweb/?p=3Dpostgresql.git&a=3Dcommitdiff&h= =3D559f9e90d