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From: Pavel Stehule <pavel.stehule@gmail.com>
Date: Wed, 7 Sep 2011 15:40:19 +0200
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Subject: Re: [BUGS] documentation bug - behave of NEW a OLD in plpgsql's
	triggers
To: Josh Kupershmidt <schmiddy@gmail.com>
Cc: Bruce Momjian <bruce@momjian.us>, pgsql-docs <pgsql-docs@postgresql.org>
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2011/9/7 Josh Kupershmidt <schmiddy@gmail.com>:
> On Tue, Sep 6, 2011 at 10:54 PM, Bruce Momjian <bruce@momjian.us> wrote:
>> Josh Kupershmidt wrote:
>>> How about a doc tweak like the attached?
>>
>> Perfect. =C2=A0Applied to 9.0, 9.1, and head. =C2=A0Thanks. =C2=A0Sorry =
for the delay.
>
> Err, as Tom's first comment in this thread explains, Pavel and I were
> both wrong: the variables in question are indeed NULL, not undefined.
> I think the docs were fine the way they were.

There is maybe bug - these variables are defined, but they has not
assigned tupledesc, so there is not possible do any test

postgres=3D# create table omega (a int, b int);
CREATE TABLE
postgres=3D# create or replace function foo_trig()
postgres-# returns trigger as $$
postgres$# begin
postgres$#   raise notice '%', new;
postgres$#   return null;
postgres$# end;
postgres$# $$ language plpgsql;
CREATE FUNCTION
postgres=3D# create trigger xxx after delete on omega for each row
execute procedure foo_trig();
CREATE TRIGGER
postgres=3D# insert into omega values(20);
INSERT 0 1
postgres=3D# delete from omega;
ERROR:  record "new" is not assigned yet
DETAIL:  The tuple structure of a not-yet-assigned record is indeterminate.
CONTEXT:  PL/pgSQL function "foo_trig" line 3 at RAISE

so current text in documentation is not correct too.

Regards

Pavel Stehule

>
> Josh
>