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Re: indexes on functions and create or replace function

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Christophe <xof(at)thebuild(dot)com>
Cc: PGSQL General <pgsql-general(at)postgresql(dot)org>
Subject: Re: indexes on functions and create or replace function
Date: 2008-08-29 01:51:22
Message-ID: 20080829015122.GI8424@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-general
Christophe wrote:
>
> On Aug 28, 2008, at 6:10 PM, Matthew Dennis wrote:
>> I'm not sure I follow.  Couldn't you track which statements were  
>> prepared that called a function and either reprepare (just like  
>> reindex, recheck, etc) or in the case of dropping a function, refuse to 
>> drop it because something depends on it?
>
> EXECUTE in PL/pgSQL accepts a string and executes it as a statement.  
> (That's different from the SQL-level EXECUTE.) I'm not sure how one  
> would track dependencies there.

There's no way at all in the general case (a function name could be
passed as a parameter, for example).  I think Matthew is suggesting to
track dependencies at run time, but that seems a recipe for burnt
fingers and an overall performance loss, for what seems a dubious gain.

Also, you have to keep in mind that we support pluggable languages.  The
function's source code is just an opaque string.  It could be anything.
I doubt anyone uses PL/LOLCODE functions in production, but PL/Java
functions are more likely, and for these we only have a class and method
name, and little else.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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