Re: pl/pgsql feature request: shorthand for argument and local variable references

On Sun, Mar 28, 2021 at 03:52:35PM +0200, Joel Jacobson wrote:
> On Sun, Mar 28, 2021, at 15:12, Pavel Stehule wrote:
> > Maybe I don't understand your proposal well, I am sorry. Creating your own language should not be hard, but in this case the plpgsql is not well extendable. The important structures are private. You can do it, but you should do a full copy of plpgsql. I don't think so you can reuse handler's routines - it is not prepared for it. Unfortunately, the handler expects only function oid and arguments, and there is not a possibility how to pass any options (if I know).
>
> Sorry, let me clarify what I mean.
>
> I mean something along the lines of adding a new nullable column to "pg_language", maybe "lanroutinelabel"?
> All other columns (lanispl, lanpltrusted, lanplcallfoid, laninline, lanvalidator) would reuse the same values as plpgsql.

It doesn't seem like a good way to handle some customization of existing
language.  It's too specialized and soon people will ask for fields to change
the default behavior of many other things and a default "routine label" may not
make sense in all languages.  If we were to do that we should probably add a
new function that would be called to setup all language specific stuff that
users may want to change.