public function getDataForExport($filter, $columns = array())
	{
        $select = $this->tableGateway->getSql()->select();
        $select->columns(array('*'));
        
        $w = new Where();
        $filters = array();
        $likes = array();
        
        foreach($columns as $columnKeys) 
        {
            $likes[] = new Like($columnKeys, '%'.$filter.'%');
        }
        
        $filters = array(new PredicateSet($likes, PredicateSet::COMBINED_BY_OR));
        
        $select->where($filters);
        
        $resultSet = $this->tableGateway->selectWith($select);
        
        return $resultSet;
        
	}