From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Daniel Verite <daniel(at)manitou-mail(dot)org>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Variable substitution in psql backtick expansion |
Date: | 2017-08-26 15:08:56 |
Message-ID: | 20786.1503760136@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> writes:
>> OK, but if human-friendly display is the use-case then it ought to
>> duplicate what psql itself would print in, eg, the startup message about
>> server version mismatch. The v4 patch does not, in particular it neglects
>> PQparameterStatus(pset.db, "server_version"). This would result in
>> printing, eg, "11.0" when the user would likely rather see "11devel".
> I understand that you would prefer VERSION_NAME to show something like
> "11devel, server 9.6.4"
No, that's not what I said. I'm just complaining that as the patch stands
it will set SERVER_NAME to "11.0", where I think it should say "11devel"
(as of today).
> In summary, my prefered option is to have:
> CLIENT_VERSION "PostgreSQL 11devel on ..."
> CLIENT_VERSION_NAME "11devel"
> CLIENT_VERSION_NUM 110000
I don't think we want to drop :VERSION; that would accomplish little
beyond breaking existing scripts. Plausible choices include duplicating
it, like:
VERSION "PostgreSQL 11devel on ..."
CLIENT_VERSION "PostgreSQL 11devel on ..."
CLIENT_VERSION_NAME "11devel"
CLIENT_VERSION_NUM 110000
or just ignoring the discrepancy:
VERSION "PostgreSQL 11devel on ..."
CLIENT_VERSION_NAME "11devel"
CLIENT_VERSION_NUM 110000
or just leaving "CLIENT" implicit for all of these variables:
VERSION "PostgreSQL 11devel on ..."
VERSION_NAME "11devel"
VERSION_NUM 110000
Robert seems to prefer the last of those, and that'd be fine with me.
(Note that CLIENT is ambiguous anyway: does it mean psql itself, or
libpq?)
> SERVER_VERSION_NAME "9.6.4"
> SERVER_VERSION_NUM 090604
I'm on board with this, except I don't think we should have any leading
zero in the numeric form. There are contexts where somebody might think
that means octal.
regards, tom lane
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