code: function select($columns){
          $this->__destruct();
          if($columns != ""){
              foreach(func_get_args() as $columns){
                  $this->select[] = $columns;
              }
          }else{
              $this->select = array();
          }
          return $this;
      }
docs: Add select clause, more calls appends to the end
  
  @param string $columns for example "column, MD5(column) AS column_md5", empty string to reset previously set columns
  @param string ...
  
  @return NotORM_Result fluent interface