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Re: PATCH: make plpgsql IN args mutable (v1)

From: Jeff Davis <pgsql(at)j-davis(dot)com>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: David Fetter <david(at)fetter(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, Steve Prentice <prentice(at)cisco(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: PATCH: make plpgsql IN args mutable (v1)
Date: 2009-07-31 04:59:10
Message-ID: 1249016350.4765.3073.camel@jdavis (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thu, 2009-07-30 at 21:45 -0400, Andrew Dunstan wrote:
> > For instance, what would it mean if y
> > SELECT foo(a) FROM mytable;
> >
> > Where foo() mutated it's IN argument? Would that really be an UPDATE?
> >
> No, surely the mutated value will only be visible within the scope of 
> the function, i.e. it will be a purely local copy that gets altered.

Oh, I misunderstood the example here:

http://archives.postgresql.org/pgsql-hackers/2009-07/msg01931.php

I thought he was saying that the PERFORM in test1() _should_ have
mutated "a", when in fact, he was trying to demonstrate that it does not
(with his patch or without).

Regards,
	Jeff Davis


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