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 <pgsql-hackers-owner+archive@lists.postgresql.org>)
	id 1m1NH7-0000ak-33
	for pgsql-hackers@arkaria.postgresql.org; Thu, 08 Jul 2021 06:12:41 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.92)
	(envelope-from <pgsql-hackers-owner+archive@lists.postgresql.org>)
	id 1m1NH5-0003eh-U0
	for pgsql-hackers@arkaria.postgresql.org; Thu, 08 Jul 2021 06:12:39 +0000
Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29])
	by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <boris@codesynthesis.com>)
	id 1m1NH5-0003a9-FM
	for pgsql-hackers@lists.postgresql.org; Thu, 08 Jul 2021 06:12:39 +0000
Received: from codesynthesis.com ([188.40.148.39])
	by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <boris@codesynthesis.com>)
	id 1m1NGz-0002x5-4y
	for pgsql-hackers@lists.postgresql.org; Thu, 08 Jul 2021 06:12:38 +0000
Received: from brak.codesynthesis.com (unknown [105.187.34.11])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by codesynthesis.com (Postfix) with ESMTPSA id DE67B5FB5A;
	Thu,  8 Jul 2021 06:12:30 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codesynthesis.com;
	s=mail1; t=1625724751;
	bh=ok5xlKrkwqBv4DIHew1P2tx/1NuXsFp4Ealuxw0anyQ=;
	h=Date:From:To:Subject:Message-ID:MIME-Version:From;
	b=BZf8c39kAMfYim8AZmjVaT/O2mqkdFGi/B7kPad4kmkm5WFFK5OIkcIkfRjzxjUnn
	 qtlJfP6wwHPlDwyqlNHedfQPwhDg3mgJpl0YUYwSGkf45TVDeaOAehvtsSV+dbeCGb
	 VU/i24NXIueqKJ/gsfOtzzOusdTq5TYugjPSbDNSZeFBAMErzGZWji6Cju1r6Giz34
	 JtAUwSMGbAkiiOptZFl4fIomIyqhlAZtAGo908ebUhoPG51Ibmg/YJbyFbWbzy44wO
	 jFxhqXaprbkoo0RFb+048f09PHjSFHJSa4FTI2NX4mMRgTiT2NI4440uNR6htFVdgU
	 tDkBMuBrae0ZA==
Received: by brak.codesynthesis.com (Postfix, from userid 1000)
	id 864B41A800C4; Thu,  8 Jul 2021 08:12:25 +0200 (SAST)
Date: Thu, 8 Jul 2021 08:12:25 +0200
From: Boris Kolpackov <boris@codesynthesis.com>
To: Alvaro Herrera <alvaro.herrera@2ndquadrant.com>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: Pipeline mode and PQpipelineSync()
Message-ID: <boris.20210708080714@codesynthesis.com>
References: <boris.20210707170157@codesynthesis.com>
 <202107071730.vkyej2goquhp@alvherre.pgsql>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <202107071730.vkyej2goquhp@alvherre.pgsql>
Organization: Code Synthesis
User-Agent: Mutt/1.5.24 (2015-08-30)
List-Id: <pgsql-hackers.lists.postgresql.org>
List-Help: <https://lists.postgresql.org/manage/>
List-Subscribe: <https://lists.postgresql.org/manage/>
List-Post: <mailto:pgsql-hackers@lists.postgresql.org>
List-Owner: <mailto:pgsql-hackers-owner@lists.postgresql.org>
List-Archive: <https://www.postgresql.org/list/pgsql-hackers>
Archived-At: 
 <https://www.postgresql.org/message-id/boris.20210708080714%40codesynthesis.com>
Precedence: bulk

Alvaro Herrera <alvaro.herrera@2ndquadrant.com> writes:

> Hmm ... aren't you trying to read more results than you sent queries?

Hm, but should I be able to? Or, to put another way, should PQisBusy()
indicate there is a result available without me sending a query for it?
That sounds very counter-intuitive to me.