Received: from malur.postgresql.org ([217.196.149.56])
	by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256)
	(Exim 4.89)
	(envelope-from <pgsql-bugs-owner+archive@lists.postgresql.org>)
	id 1h1CA0-000561-MA
	for pgsql-bugs@arkaria.postgresql.org; Tue, 05 Mar 2019 15:39:16 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.89)
	(envelope-from <pgsql-bugs-owner+archive@lists.postgresql.org>)
	id 1h1C9z-00068h-EX
	for pgsql-bugs@arkaria.postgresql.org; Tue, 05 Mar 2019 15:39:15 +0000
Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29])
	by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256)
	(Exim 4.89)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1h1C9z-00067W-7x
	for pgsql-bugs@lists.postgresql.org; Tue, 05 Mar 2019 15:39:15 +0000
Received: from sss.pgh.pa.us ([66.207.139.130])
	by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256)
	(Exim 4.89)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1h1C9w-0002zJ-PR
	for pgsql-bugs@lists.postgresql.org; Tue, 05 Mar 2019 15:39:14 +0000
Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1])
	by sss.pgh.pa.us (8.14.4/8.14.4) with ESMTP id x25Fd7Ar019354;
	Tue, 5 Mar 2019 10:39:07 -0500
From: Tom Lane <tgl@sss.pgh.pa.us>
To: thibaut.madelaine@dalibo.com
cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #15669: Error with unnest in PG 11 (ERROR: 0A000)
In-reply-to: <15669-02fb3296cca26203@postgresql.org>
References: <15669-02fb3296cca26203@postgresql.org>
Comments: In-reply-to PG Bug reporting form <noreply@postgresql.org>
	message dated "Tue, 05 Mar 2019 11:06:00 +0000"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <19352.1551800347.1@sss.pgh.pa.us>
Content-Transfer-Encoding: quoted-printable
Date: Tue, 05 Mar 2019 10:39:07 -0500
Message-ID: <19353.1551800347@sss.pgh.pa.us>
List-Id: <pgsql-bugs.lists.postgresql.org>
List-Help: <https://lists.postgresql.org/manage/>
List-Subscribe: <https://lists.postgresql.org/manage/>
List-Post: <mailto:pgsql-bugs@lists.postgresql.org>
List-Owner: <mailto:pgsql-bugs-owner@lists.postgresql.org>
List-Archive: <https://www.postgresql.org/list/pgsql-bugs>
Precedence: bulk

PG Bug reporting form <noreply@postgresql.org> writes:
> In PostgreSQL 10.7 and before, it is possible to run the following query=
:

> thibaut=3D# WITH test AS ( SELECT array[1,2] AS intarr ) =

>                  SELECT unnest(intarr) AS lot_id FROM test WHERE false;

> In version 11.2, the same query fails:
> ERROR:  0A000: set-valued function called in context that cannot accept =
a set

Hmm, that's definitely a bug.  It looks like we're forgetting to make
a ProjectSet plan node for the unnest() if we realize that the query
is a no-op; but I'm not sure why 10.x doesn't have the same issue.
Digging ...

			regards, tom lane