Postgres planner bug in 7.3.x and 7.4.1 ?

Hello

We're experiencing weird behaviours with both Postgres 7.3.x and 7.4.1 
versions, relating to views based on views including fields based upon 
plpgsql functions. Attached is a .sql file showing our problems, from a 
co-worker who doesn't have immediate access to this mailing list.

Here's the psql output on a 7.4.1 version (t1, t2 already created), showing 
the function being called :

postgres@msi:/$ psql -p5433 -d t2g_3 -f /tmp/t1.sql
You are now connected as new user postgres.
psql:/tmp/t1.sql:32: ERROR:  function "plpgsql_call_handler" already exists 
with same argument types
psql:/tmp/t1.sql:35: ERROR:  language "plpgsql" already exists
CREATE FUNCTION
CREATE VIEW
CREATE VIEW
CREATE VIEW
CREATE VIEW
psql:/tmp/t1.sql:284: NOTICE:  f1 >>>>>>>> 8980
psql:/tmp/t1.sql:284: NOTICE:  f1 >>>>>>>> 8981
psql:/tmp/t1.sql:284: NOTICE:  f1 >>>>>>>> 8982
  num_adr | num_person | firstname | name
---------+------------+-----------+------
     6231 |       8982 | Chico     | Marx
(1 row)

  num_adr | num_person | firstname | name
---------+------------+-----------+------
     6231 |       8982 | Chico     | Marx
(1 row)

Thanks for any support

laurent

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.545 / Virus Database: 339 - Release Date: 27/11/2003