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()
Date: Thu, 24 Jun 2021 11:06:42 +0200
Message-ID: <boris.20210624110032@codesynthesis.com> (raw)
In-Reply-To: <202106231622.ppuztv2vegix@alvherre.pgsql>
References: <boris.20210623125826@codesynthesis.com>
<202106231622.ppuztv2vegix@alvherre.pgsql>
Alvaro Herrera <alvaro.herrera@2ndquadrant.com> writes:
> Curious -- I just noticed that the server understands a message 'H' that
> requests a flush of the server buffer. However, libpq has no way to
> generate that message as far as I can see. I think you could use that
> to request results from the pipeline, without the sync point.
>
> I wonder if it's worth adding an entry point to libpq to allow access to
> this.
Yes, I think this can be useful. For example, an application may wish
to receive the result as soon as possible in case it's used as input
to some further computation.
> PQrequestFlush() or something like that ...
I think I would prefer PQflushResult() or something along these
lines ("request" is easy to misinterpret as "client request").
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To: pgsql-hackers@postgresql.org
Cc: boris@codesynthesis.com, alvaro.herrera@2ndquadrant.com, pgsql-hackers@lists.postgresql.org
Subject: Re: Pipeline mode and PQpipelineSync()
In-Reply-To: <boris.20210624110032@codesynthesis.com>
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