Date: Wed, 22 Jul 2020 11:36:05 -0400
From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: Justin Pryzby <pryzby@telsasoft.com>,
	Julien Rouhaud <rjuju123@gmail.com>,
	Tomas Vondra <tomas.vondra@2ndquadrant.com>,
	pgsql-hackers@postgresql.org
Subject: Re: expose parallel leader in CSV and log_line_prefix
Message-ID: <20200722153605.GA961@alvherre.pgsql>
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On 2020-Jul-21, Michael Paquier wrote:

> On Mon, Jul 20, 2020 at 11:12:31PM -0500, Justin Pryzby wrote:

> >> +       Process ID of the parallel group leader if this process is involved
> >> +       in parallel query, or null.  For a parallel group leader, this field
> >> +       is <literal>NULL</literal>.
> >>        </para></entry>

> > | For a parallel worker, this is the Process ID of its leader process.  Null
> > | for processes which are not parallel workers.

How about we combine both.  "Process ID of the parallel group leader, if
this process is a parallel query worker.  NULL if this process is a
parallel group leader or does not participate in parallel query".

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services