/**
* Adds "OR ON .
* .." conditions for the last created JOIN statement.
*
* @param mixed $c1
* column name or array($column, $alias) or object
* @param string $op
* logic operator
* @param mixed $c2
* column name or array($column, $alias) or object
*
* @return $this
*/
public function or_on($c1, $op, $c2)
{
$this->_last_join->or_on($c1, $op, $c2);
return $this;
}
