From: Tom Lane <tgl@sss.pgh.pa.us>
To: "tsunakawa.takay@fujitsu.com" <tsunakawa.takay@fujitsu.com>
cc: "'Tomas Vondra'" <tomas.vondra@enterprisedb.com>,
        Amit Langote <amitlangote09@gmail.com>, Zhihong Yu <zyu@yugabyte.com>,
        "Andrey V. Lepikhov" <a.lepikhov@postgrespro.ru>,
        Tomas Vondra <tomas.vondra@2ndquadrant.com>,
        "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Subject: Re: POC: postgres_fdw insert batching
In-reply-to: 
 <TYAPR01MB2990DB767E314A72A063EA32FEA10@TYAPR01MB2990.jpnprd01.prod.outlook.com>
References: <20200628151002.7x5laxwpgvkyiu3q@development>
 <16fcfd4c-2d5e-67f7-fa69-9b5d119bac52@enterprisedb.com>
 <TYAPR01MB299026DB0E91E513664C162FFEA30@TYAPR01MB2990.jpnprd01.prod.outlook.com>
 <ba58f299-d50b-f347-4a0f-778cb6ac5588@enterprisedb.com>
 <TYAPR01MB2990A053D902EDF6244090BDFEA30@TYAPR01MB2990.jpnprd01.prod.outlook.com>
 <CA+HiwqH-7+L0B7iNWcAe8auWch=-EnbRkLYMG-27K4rUKsWKOQ@mail.gmail.com>
 <TYAPR01MB29903CBD68C9DA42B67D9EB6FEA30@TYAPR01MB2990.jpnprd01.prod.outlook.com>
 <CA+HiwqGiwxSc8kc0PgPef5DgnP7NTRHVyAZJG3zxY4XBivbfLQ@mail.gmail.com>
 <9d94c863-ce7c-ea7f-6b84-834c98929e2f@enterprisedb.com>
 <CA+HiwqHTeQKqRpCA3TGZSCYTVOcUoUdXeSrRfjRRcmT1CfM1oA@mail.gmail.com>
 <7e70a11e-cf5d-2e5f-a802-274c5e0e236b@enterprisedb.com>
 <eb81a728-4ac3-823e-0017-54a9491f5600@enterprisedb.com>
 <CALNJ-vSt7Fn=oj4NxAyCDQQF-1yxmP=LYyQwciApg4L+QdYJQw@mail.gmail.com>
 <3ca9496f-0827-bf21-b709-593de63440a5@enterprisedb.com>
 <CA+HiwqF2nZX2VxZy0tL_BfuEQgof=w3b54Ei73LdwOx7sVemNg@mail.gmail.com> <4faa3d!
 09-0fc8-c4d6-7aec-87428fabd161@enterprisedb.com>
 <TYAPR01MB2990DB767E314A72A063EA32FEA10@TYAPR01MB2990.jpnprd01.prod.outlook.com>
Comments: In-reply-to "tsunakawa.takay@fujitsu.com"
 <tsunakawa.takay@fujitsu.com>
	message dated "Thu, 21 Jan 2021 01:52:48 +0000"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <799651.1611194626.1@sss.pgh.pa.us>
Content-Transfer-Encoding: quoted-printable
Date: Wed, 20 Jan 2021 21:03:46 -0500
Message-ID: <799652.1611194626@sss.pgh.pa.us>
Precedence: bulk

"tsunakawa.takay@fujitsu.com" <tsunakawa.takay@fujitsu.com> writes:
> Just for learning, could anyone tell me what this loop for?  I thought c=
urrent Postgres's DML supports a single target table, so it's enough to ha=
ndle the first element of mtstate->resultRelInfo.

The "single target table" could be partitioned, in which case there'll be
multiple resultrelinfos, some of which could be foreign tables.

			regards, tom lane