The following bug has been logged on the website:

Bug reference:      7641
Logged by:          Sergey
Email address:      ser...@booksys.com
PostgreSQL version: 9.2.1
Operating system:   Windows XP / Ubuntu 10.04 (Lucid)
Description:        

Postgres 9.2.1
Reproduced the problem on Windows XP and Ubuntu 10.04

Steps to reproduce:

1. Create a new database: 
CREATE DATABASE test; 
Connect to the new database.

2. CREATE TABLE test1 (id int);

3. 
CREATE OR REPLACE FUNCTION drop_trigger_test() RETURNS void AS $$
BEGIN
   DROP TRIGGER IF EXISTS invalid_trigger ON test1;
END; $$ LANGUAGE plpgsql;

4. SELECT drop_trigger_test();
Result:
NOTICE:  trigger "invalid_trigger" for table "test1" does not exist,
skipping
CONTEXT:  SQL statement "DROP TRIGGER IF EXISTS invalid_trigger ON test1"
PL/pgSQL function drop_trigger_test() line 3 at SQL statement

5. SELECT drop_trigger_test();
Result:
ERROR:  must specify relation and object name
CONTEXT:  SQL statement "drop trigger if exists invalid_trigger on test2"
PL/pgSQL function drop_trigger_test2() line 3 at SQL statement

For some reason I can run this function without error only once on a fresh
connection. Did not have this problem in 8.4.x and 9.1.6



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