Re: multiple CREATE FUNCTION AS items for PLs

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: Hannu Krosing <hannu(at)krosing(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: multiple CREATE FUNCTION AS items for PLs
Date: 2012-12-28 21:05:36
Message-ID: 50DE09A0.5070707@gmx.net
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On 12/28/12 7:09 AM, Hannu Krosing wrote:
> Maybe just export the function with the same name as is defined in
> CREATE FUNCTION ?
>
> And in case we do want to override it, call it
>
> CREATE FUNCTION foo(a int,b int, c text) AS $$
> # plpython: module modulename
> import x,y,z
>
> def foo(a,b,c):
> return a + b + c
>
> def foo2(a,b,c):
> return foo(a,b,int(c))
>
> __call__ = foo2
>
> $$ language plpythonu

I like this approach, except I would call the attribute something like
__plpy_something___.

> If we always require the export using __call__ in new-style pl/python
> functions we could
> leave out the "# plpython: module " part altogether and just test for
> __call__ in the compiled
> modules namespace after trying to compile the source code as module and
> re-compile
> using current methods if this fails.

That's a thought. I'm not yet sure whether I prefer it.

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