From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | Jeff Shanab <jshanab(at)earthlink(dot)net> |
Cc: | pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #5154: ERROR: cannot assign non-composite value to a row variable |
Date: | 2009-10-31 04:37:00 |
Message-ID: | 162867790910302137k5e678473v250b89004a69b61e@mail.gmail.com |
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Thread: | |
Lists: | pgsql-bugs |
Hello
2009/10/31 Jeff Shanab <jshanab(at)earthlink(dot)net>:
>
> The following bug has been logged online:
>
> Bug reference: 5154
> Logged by: Jeff Shanab
> Email address: jshanab(at)earthlink(dot)net
> PostgreSQL version: 8.3.5
> Operating system: Linux
> Description: ERROR: cannot assign non-composite value to a row
> variable
> Details:
>
> As discussed on the irc. I had a problem with a utility function that was
> being passed a NEW row and a null for the OLD row. The error was created
> when it tries to store the row variable in the local variables. RhodiumToad
> on the list provided this simple test.
>
> create type foo1 as (a integer, b text);
> CREATE TYPE
> create type foo2 as (c integer, d foo1);
> CREATE TYPE
>
> create function foo() returns foo2 language plpgsql as $f$ declare v foo2;
> begin v := null; return v; end; $f$;
> CREATE FUNCTION
>
This isn't bug - it is just feature. ROW value cannot contain scalar
value. If you would to like reset variable, use NULL row constant.
BEGIN
v := (NULL, NULL);
-- it is equalent to NULL
RAISE NOTICE 'IS IT NULL %', v IS NULL;
RETURN NULL;
END;
Regards
Pavel Stehule
> select foo();
>
> ERROR: cannot assign non-composite value to a row variable
>
> CONTEXT: PL/pgSQL function "foo" line 1 at assignment
>
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