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Re: 8.3 PLpgSQL Can't Compare Records?

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: "David E(dot) Wheeler" <david(at)kineticode(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: 8.3 PLpgSQL Can't Compare Records?
Date: 2009-07-01 18:45:04
Message-ID: b42b73150907011145s7852a85aob70db7d212dcc0bd@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Wed, Jul 1, 2009 at 1:35 PM, David E. Wheeler<david(at)kineticode(dot)com> wrote:
> This code:
>
>    CREATE OR REPLACE FUNCTION foo() returns boolean as $$
>    DECLARE
>        have_rec record;
>        want_rec record;
>    BEGIN
>        have_rec := row(1, 2);
>        want_rec := row(3, 5);
>        RETURN have_rec IS DISTINCT FROM want_rec;
>    END;
>    $$ language plpgsql;
>
>    SELECT ROW(1, 2) IS DISTINCT FROM ROW(3, 5);
>
>    SELECT foo();
>    DROP FUNCTION foo();
>
> Works as expected on 8.4, outputting:
>
>     ?column?
>    ----------
>     t
>    (1 row)
>
>    Time: 48.626 ms
>     foo
>    -----
>     t
>    (1 row)
>
> On 8.3, however, the row comparisons in the SQL statement works, but fails
> in the PL/pgSQL function, with this output:
>
>     ?column?
>    ----------
>     t
>    (1 row)
>
>    psql:huh.sql:14: ERROR:  operator does not exist: record = record
>    LINE 1: SELECT   $1  IS DISTINCT FROM  $2
>                         ^
>    HINT:  No operator matches the given name and argument type(s). You might
> need to add explicit type casts.
>    QUERY:  SELECT   $1  IS DISTINCT FROM  $2
>    CONTEXT:  PL/pgSQL function "foo" line 7 at RETURN
>
>
> Is this a known issue in 8.3? If so, is there a known workaround?
>

fyi: works in 8.4, as part of a broad fix of composite type comparison ops

merlin

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Next:From: Merlin MoncureDate: 2009-07-01 18:47:40
Subject: Re: 8.3 PLpgSQL Can't Compare Records?
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