| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: PSQL commands: \quit_if, \quit_unless |
| Date: | 2016-12-16 17:33:19 |
| Message-ID: | CAKFQuwYG7wPrC1tDdL2BchsMucmmp7-XraBpr8kbYcbf_C_4Aw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Dec 16, 2016 at 10:28 AM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
wrote:
> 2016-12-16 18:21 GMT+01:00 David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>:
>
>> On Fri, Dec 16, 2016 at 9:55 AM, Robert Haas <robertmhaas(at)gmail(dot)com>
>> wrote:
>>
>>>
>>> If the expected committed patch set includes #5 then this becomes a
>> matter for reviewer convenience so never mind. But if its at all possible
>> for #5 to be punted down the road incorporating the eventual "not var" and
>> "not(var)" syntax into #1 as a kind of shim would seem desirable.
>>
>
> why do you need special operator for negation? there is only one use case.
> It can be solved by \if_not
>
Not following the thread that closely and the section Robert quoted didn't
include "\if_not" as a syntax option. I figured the idea was to limit the
number of backslash commands and leave the power in the expression
evaluation.
David J.
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