now about psql and one function

in psql , file command.c : 1473 there is a query to check state for
superuser, and this query is in begin/end transaction.
When user dont have perm to read pg_user its fail but transation is never
end, and ist make some confusion because user have to write "END;" or
"ROLLBACK;" themself. I just removed BEGIN and END from this query.

ok, and this function :
create or replace func () returns INT as '
DECLARE
cnt INT;
BEGIN
CREATE TEMP TABLE ble (i INT);
SELECT INTO cnt count(*) FROM ble;
DROP TABLE ble;
RETURN cnt;
END;
' LANGUAGE 'plpgsql';

and at first time everythink is ok, but in next time is error like this :
pg_class_aclcheck : relation <nr> not found .
(This function is only example , and i know that it doesnt sens)
I think its by SysCache, how can i reset it ? or turn off ? or reload ?