The following bug has been logged online:

Bug reference: 2539
Logged by: David Fetter
Email address: david (AT) fetter (DOT) org
PostgreSQL version: All
Operating system: Linux and OSX that I've tested
Description: PL/PgSQL doesn't disallow COPY commands on compile, even
though it disallows them.
Details:

Here's a repro:

davidfetter=> SHOW check_function_bodies ;
check_function_bodies
-----------------------
on
(1 row)

davidfetter=> CREATE OR REPLACE FUNCTION bad_func()
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
CREATE TEMPORARY TABLE bad(i INTEGER) ON COMMIT DROP;
INSERT INTO bad
SELECT s.i FROM generate_series(1,10) AS s(i);
COPY bad TO stdout;
END;
$$;
CREATE FUNCTION
davidfetter=> select bad_func();
ERROR: SPI_execute_plan failed executing query "COPY bad TO stdout":
SPI_ERROR_COPY
CONTEXT: PL/pgSQL function "bad_func" line 5 at SQL statement

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match

"David Fetter" <david (AT) fetter (DOT) org> writes:
There are many many things that won't be checked until execution.
I can't get excited about this one.

regards, tom lane

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TIP 2: Don't 'kill -9' the postmaster

On Wed, Jul 19, 2006 at 07:02:15PM -0400, Tom Lane wrote:
I just wanted to get it in the queue, wherever it should be.

Cheers,
D
--
David Fetter <david (AT) fetter (DOT) org> http://fetter.org/
phone: +1 415 235 3778 AIM: dfetter666
Skype: davidfetter

Remember to vote!

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TIP 2: Don't 'kill -9' the postmaster