use of temporary tables in functions

Hi,

While using a temporary table in a function, it seems that after dropping the table it stays in the functions cache.

create function tmp_fn() returns integer as'
begin
        create temporary table test(id integer primary key, x_val integer);
        insert into test (id, x_val) values(1,2);
        drop  table test;
return 1;
end;'
language 'plpgsql';

The next time it comes back with a message "Relation 128863 does not exist". How can we avoid the oid of the table from being left in the cache?

Thanks,
Alfred

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