Re: [HACKERS] Packages: Again

>
> Still I little bit afraid about nesting - Postgres allows function overloading with specific mechanism of selecting
calledfunction. Sometimes it is problematic now, and the this structure is flat.  
>
> I like a idea of more close relation between function and schema. This means implicit setting of SEARCH_PATH to
functionschema. It is simply but powerful idea.  
>
> CREATE FUNCTION mod.func()
> AS $$ $$ MODULE VISIBILITY
>
> can be dynamically executed like
> CREATE FUNCTION mod.fun()
> AS $$
>   SET SEARCH_PATH TO "mod,$SEARCH_PATH";
>   ..
> $$;
Ah, yes.
It is my understanding that PG treats functions more like macros.
That is the search_path for queries inside the function is not fixed to the one in effect when the function was
defined.
This does have advantages in some cases, but it hurts in this case.
What you are describing is syntax to force that in some form or other.
This is actually not hard to do at all.
PG already records the search path in the function cache (I think) and plan source cache (I know), just not in pg_proc.
If PG supported this functionality it would improve the mapping.

> I understand well so missing nested structures is big complication when you do port from environment where this
functionalityis used. But the nesting means usually more complex solution - and in these days I don't believe so it is
necessary.PLpgSQL doesn't allow nested functions - it is strongly reduced against original PL/SQL - and it is visible
onlywhen you do migration from Oracle.  
I’m not talking about nested PLpgSQL function definition. That is indeed rather advanced and while I have seen it (and
its’ssupported in DB2 of that reason) I would not consider it high priority. 
Multiple packages in different schema are common however because applications use schemas for versioning. That’s why
flatteningthe package into a schema as supported today does not work in these cases. 

Cheers
Serge