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From: Etsuro Fujita <fujita.etsuro@lab.ntt.co.jp>
To: Antonin Houska <ah@cybertec.at>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Andrew Gierth <andrew@tao11.riddles.org.uk>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Problems with plan estimates in postgres_fdw
Date: Tue, 05 Mar 2019 18:28:07 +0900
Message-ID: <5C7E4127.2030802@lab.ntt.co.jp> (raw)
In-Reply-To: <7520.1551439018@localhost>
References: <87pnz1aby9.fsf@news-spur.riddles.org.uk>
	<1175.1533220908@sss.pgh.pa.us>
	<5BB739CD.6040002@lab.ntt.co.jp>
	<5BBC4140.50403@lab.ntt.co.jp>
	<5C17A00E.5000005@lab.ntt.co.jp>
	<5C232F39.9060509@lab.ntt.co.jp>
	<5C25C7B5.2010802@lab.ntt.co.jp>
	<5C518631.5080401@lab.ntt.co.jp>
	<10994.1549559088@localhost>
	<5C5D778F.3080501@lab.ntt.co.jp>
	<5C6D474F.5010703@lab.ntt.co.jp>
	<30939.1550848901@localhost>
	<5C73B7FB.2010309@lab.ntt.co.jp>
	<7520.1551439018@localhost>

(2019/03/01 20:16), Antonin Houska wrote:
> Etsuro Fujita<fujita.etsuro@lab.ntt.co.jp>  wrote:

>> Conversely, it appears that add_foreign_ordered_paths() added by the patchset
>> would generate such pre-sorted paths *redundantly* when the input_rel is the
>> final scan/join relation.  Will look into that.
>
> Currently I have no idea how to check the plan created by FDW at the
> UPPERREL_ORDERED stage, except for removing the sort from the
> UPPERREL_GROUP_AGG stage as I proposed here:
>
> https://www.postgresql.org/message-id/11807.1549564431%40localhost

I don't understand your words "how to check the plan created by FDW". 
Could you elaborate on that a bit more?

Best regards,
Etsuro Fujita

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