Re: Improvements in psql hooks for variables

From: "Daniel Verite" <daniel(at)manitou-mail(dot)org>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Stephen Frost" <sfrost(at)snowman(dot)net>,"Rahila Syed" <rahilasyed90(at)gmail(dot)com>,"Ashutosh Bapat" <ashutosh(dot)bapat(at)enterprisedb(dot)com>,"pgsql-hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Improvements in psql hooks for variables
Date: 2016-11-21 13:29:57
Message-ID: 4d4b8d34-6233-4fb4-93dc-7e929808b982@mm
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Tom Lane wrote:

> Stephen Frost <sfrost(at)snowman(dot)net> writes:
> > In reviewing this patch, I also noticed that it's set up to assume a
> > 'true' result when a variable can't be parsed by ParseVariableBool.
>
> I suppose that's meant to be backwards-compatible with the current
> behavior:
>
> regression=# \timing foo
> unrecognized value "foo" for "\timing"; assuming "on"
> Timing is on.

Exactly. The scope of the patch is limited to the effect
of \set assignments to built-in variables.

> but I agree that if we're changing things in this area, that would
> be high on my list of things to change. I think what we want going
> forward is to disallow setting "special" variables to invalid values,
> and that should hold both for regular variables that have special
> behaviors, and for the special-syntax cases like \timing.

+1

Best regards,
--
Daniel Vérité
PostgreSQL-powered mailer: http://www.manitou-mail.org
Twitter: @DanielVerite

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