original_string: public function columns()
      {
          if ($this->columns->isEmpty()) {
              $this->columns->push($this->current);
          }
  
          return $this->columns;
      }
code: public function columns()
      {
          if ($this->columns->isEmpty()) {
              $this->columns->push($this->current);
          }
  
          return $this->columns;
      }
code_tokens: public function columns ( ) { if ( $ this -> columns -> isEmpty ( ) ) { $ this -> columns -> push ( $ this -> current ) ; } return $ this -> columns ; }
docstring: Get all columns in filter layout.
  
  @return Collection
docstring_tokens: Get all columns in filter layout .