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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Etsuro Fujita <etsuro.fujita@gmail.com>
Cc: Ibrar Ahmed <ibrar.ahmad@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Cc: Neil Chen <carpenter.nail.cz@gmail.com>
Subject: Re: BUG #16583: merge join on tables with different DB collation behind postgres_fdw fails
Date: Sat, 25 Sep 2021 10:59:27 -0400
Message-ID: <2512647.1632581967@sss.pgh.pa.us> (raw)
In-Reply-To: <CAPmGK16g4qDfCqL7hAAdBpkCjz62gA1FSBpKtH=Bfnm6L=qkfA@mail.gmail.com>
References: <16583-4dc8f6c3b8ed24fa@postgresql.org>
	<422379.1612684550@sss.pgh.pa.us>
	<161476090989.29967.7097745522340560681.pgcf@coridan.postgresql.org>
	<CALtqXTdeSReq0Y1-mRAMO-SivqDRX_caamymdH9f=zsfLxsjow@mail.gmail.com>
	<3404441.1626208861@sss.pgh.pa.us>
	<CALtqXTdV2v5KmBNF1c_1uA=eYaLUZE7ecpxaNbLXo823=CEVzQ@mail.gmail.com>
	<CAPmGK15KFjpiHcu+fLVOJzH=41gTgTOqbbaUSwib1CKX0io69A@mail.gmail.com>
	<2201880.1630528969@sss.pgh.pa.us>
	<CAPmGK15ohpwdAPYA=Fw+C+DTdoPMWrpr6_q_XR6u3eJH7MSkVg@mail.gmail.com>
	<3683993.1631203221@sss.pgh.pa.us>
	<CAPmGK17wvbzpb6jsTEX7bK4JvoTqJK3M=MZx9xnVS=GhWs9_Ww@mail.gmail.com>
	<CAPmGK1759RxwEn2xH2nNqaK2LFOG1v9HkMMO4kpJAqrNfnho-Q@mail.gmail.com>
	<2438715.1632510693@sss.pgh.pa.us>
	<CAPmGK16g4qDfCqL7hAAdBpkCjz62gA1FSBpKtH=Bfnm6L=qkfA@mail.gmail.com>

Etsuro Fujita <etsuro.fujita@gmail.com> writes:
> On Sat, Sep 25, 2021 at 4:11 AM Tom Lane <tgl@sss.pgh.pa.us> 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





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