Re: Fwd: Re: proposal: schema variables

pá 17. 1. 2025 v 16:35 odesílatel Bruce Momjian <bruce(at)momjian(dot)us> napsal:

> On Fri, Jan 17, 2025 at 04:32:07PM +0100, Pavel Stehule wrote:
> > This discussion was around 2017 when I wrote a proposal and I hadn't a
> feeling
>
> 2017 is seven years ago so it would be good to get current feedback on
> the desirability of this feature.
>
> > There is one stronger argument for session variables - we are missing
> global
> > temporary tables. It is a real
> > limit and more times I found users with bloated pg_class, pg_attributes
> due
> > using temp tables. I don't believe
> > so we can have a global temp table - it is a significantly more
> difficult task
> > than session variables. At the end
> > session variables are trivial against global temp tables, and can replace
> > global temp tables in some use cases.
> > And the solution can be nicer, cleaner, safer than with a workaround
> based on
> > GUC.
>
> So this feature would be like global GUC variables, with permission
> control?
>

+ types and domain type check - holds data in binary form - there are not
conversions binary, text
+ it is declared - so less space for misuse is there. Custom GUC are
absolutely tolerant
+ it is a fully database object, only owner can alter it, and event
triggers are supported, sinval
+ possibility to set mutability, default value

Regards

Pavel

>
> --
> Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
> EDB https://enterprisedb.com
>
> Do not let urgent matters crowd out time for investment in the future.
>
>
>