Active record WHERE clause not working?

[eluser]xarazar[/eluser]
I looked closer into the DB_active_rec.php and analysed the order_by() method.
When I print_r the value of the $this->ar_orderby property it is clear that the property has the expected value of Array ( [0] => `position` desc ).

But in the _compile_select() method $this->ar_orderby is empty.

Does it mean the properties don't retain their value throughout the class?

Thanks in advance for any contribution.