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From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: mhh(at)mindspring(dot)com
Cc: hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: ALTER FUNCTION problem
Date: 2000-12-02 05:11:23
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Mark Hollomon <mhh(at)mindspring(dot)com> writes:
> plpgsql. plperl and pltcl all cache the result of a compile of prosrc.

plpgsql does, but I didn't think the other two do.

> I would like to propose that a new attribute be added to pg_proc
> 'proserial'.  'CREATE FUNCTION' will set proserial to 0. 'ALTER
> FUNCTION' will increment it each time. It would be up to the
> individual PL handlers to check to make sure that their cache is not
> out of date.

This is completely inadequate for plpgsql, if not for the others,
because plpgsql also caches query plans --- which depend on more than
the text of the function.  I don't think it's worth our time to put
in a partial solution; we need to think about a generic cache
invalidation mechanism.

Jan Wieck has posted some comments about this, and I think there was
also some discussion in connection with Karel Zak's proposed cross-
backend query plan cache.  Check the archives...

			regards, tom lane

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