Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mU99J-0001xc-Q3 for pgsql-hackers@arkaria.postgresql.org; Sat, 25 Sep 2021 14:59:33 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1mU99I-0003xz-PT for pgsql-hackers@arkaria.postgresql.org; Sat, 25 Sep 2021 14:59:32 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mU99I-0003xq-Hl for pgsql-hackers@lists.postgresql.org; Sat, 25 Sep 2021 14:59:32 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by makus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mU99G-0003Wo-Ix for pgsql-hackers@lists.postgresql.org; Sat, 25 Sep 2021 14:59:31 +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 18PExRUv2512648; Sat, 25 Sep 2021 10:59:28 -0400 From: Tom Lane To: Etsuro Fujita cc: Ibrar Ahmed , PostgreSQL Hackers , Neil Chen Subject: Re: BUG #16583: merge join on tables with different DB collation behind postgres_fdw fails In-reply-to: References: <16583-4dc8f6c3b8ed24fa@postgresql.org> <422379.1612684550@sss.pgh.pa.us> <161476090989.29967.7097745522340560681.pgcf@coridan.postgresql.org> <3404441.1626208861@sss.pgh.pa.us> <2201880.1630528969@sss.pgh.pa.us> <3683993.1631203221@sss.pgh.pa.us> <2438715.1632510693@sss.pgh.pa.us> Comments: In-reply-to Etsuro Fujita message dated "Sat, 25 Sep 2021 22:55:29 +0900" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <2512646.1632581967.1@sss.pgh.pa.us> Date: Sat, 25 Sep 2021 10:59:27 -0400 Message-ID: <2512647.1632581967@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk Etsuro Fujita writes: > On Sat, Sep 25, 2021 at 4:11 AM Tom Lane wrote: >> As a short-term answer, I propose that we apply (and back-patch) the >> attached documentation changes. > The attached patch looks good to me. I've pushed that, and marked the current CF entry as returned with feedback. I'm not sure how soon I might get around to trying the idea of an explicit "unknown" collation ... if anyone wants to take a stab at that, feel free. regards, tom lane