From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndquadrant.com>
cc: Robert Haas <robertmhaas@gmail.com>,
        "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Subject: Re: [COMMITTERS] pgsql: Add psql variables showing server version and
 psql version.
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Comments: In-reply-to Simon Riggs <simon@2ndquadrant.com>
	message dated "Tue, 05 Sep 2017 10:41:11 -0700"
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Date: Tue, 05 Sep 2017 13:59:04 -0400
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Simon Riggs <simon@2ndquadrant.com> writes:
> Does raise the further question of how psql behaves when we connect to
> a pre-10 server, so we have SERVER_VERSION_NUM but yet it is not set.

Huh?  The variable will be set in any case.  It should be correct for any
server version we might find in the wild --- so far as I can tell from the
commit history, every version supporting FE/BE protocol version 3 has sent
server_version at connection start.  With a pre-7.4 server, it looks like
the variables would be set to "0.0.0" and "0" respectively.

			regards, tom lane


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