human
Solve the following python programming problem given the following code:
@ reflection.cache 
@ _db_plus_owner 
def get_foreign_keys(self, connection, tablename, dbname, owner, schema, **kw) : 
    RR = ischema.ref_constraints 
    C = ischema.key_constraints.alias ('C') 
    R = ischema.key_constraints.alias ('R') 
    s = sql.select ([C.c.column_name, R.c.table_schema, R.c.table_name, R.c.column_name, RR.c.constraint_name, RR.c.match_option, RR.c.update_rule, RR.c.delete_rule], sql.and_ ((C.c.table_name == RR), (C.c.table_schema == owner), (C.c.constraint_name == RR.c.constraint_name), (R.c.constraint_name == RR.c.unique_constraint_name), (C.c.ordinal_position == R.c.ordinal_position)), order_by = [RR.c.constraint_name, R.c.ordinal_position]) 
    fkeys = [] 
    (fknm, scols, rcols) = (None, [], []) 
    def fkey_rec() : 
        return { 
            'name' : None, 
            'constrained_columns' : [], 
            'referred_schema' : None, 
            'referred_table' : None, 
            'referred_columns' : [], 
} 
fkeys = util.defaultdict (fkey_rec) 
    for r in connection.execute (s).fetchall () : 
        (scol, rschema, rtbl, rcol, rfknm, fkmatch, fkuprule, fkdelrule) = r 
        rec = fkeys [rfknm] 
        rec ['name'] = rfknm 
        if (not rec ['referred_table']) : 
            rec ['referred_table'] = rtbl 
            if ((schema is not None) or (owner != rschema)) : 
                if dbname : 
                    rschema = ((dbname + '.') + rschema) 
rec ['referred_schema'] = rschema 
(local_cols, remote_cols) = (rec ['constrained_columns'], rec ['referred_columns']) 
        local_cols.append (scol) 
        remote_cols.append (rcol) 
return list (fkeys.values ()) 

    
    

    Fix the buggy line: s = sql.select ([C.c.column_name, R.c.table_schema, R.c.table_name, R.c.column_name, RR.c.constraint_name, RR.c.match_option, RR.c.update_rule, RR.c.delete_rule], sql.and_ ((C.c.table_name == RR), (C.c.table_schema == owner), (C.c.constraint_name == RR.c.constraint_name), (R.c.constraint_name == RR.c.unique_constraint_name), (C.c.ordinal_position == R.c.ordinal_position)), order_by = [RR.c.constraint_name, R.c.ordinal_position])
assistant
#Here is Python program to fix the buggy line: s = sql.

s = sql.select ([C.c.column_name, R.c.table_schema, R.c.table_name, R.c.column_name, RR.c.constraint_name, RR.c.match_option, RR.c.update_rule, RR.c.delete_rule], sql.and_ ((C.c.table_name == tablename), (C.c.table_schema == owner), (C.c.constraint_name == RR.c.constraint_name), (R.c.constraint_name == RR.c.unique_constraint_name), (C.c.ordinal_position == R.c.ordinal_position)), order_by = [RR.c.constraint_name, R.c.ordinal_position])