original_string: public function fetchColumnAll($sql, array $params = array(), $pos = 0)
      {
          return $this->run($sql, $params)->fetchAll(PDO::FETCH_COLUMN, $pos);
      }
code: public function fetchColumnAll($sql, array $params = array(), $pos = 0)
      {
          return $this->run($sql, $params)->fetchAll(PDO::FETCH_COLUMN, $pos);
      }
code_tokens: public function fetchColumnAll ( $ sql , array $ params = array ( ) , $ pos = 0 ) { return $ this -> run ( $ sql , $ params ) -> fetchAll ( PDO :: FETCH_COLUMN , $ pos ) ; }
docstring: Returns a simple array of columns
  @param string $sql
  @param array $params
  @param integer $pos
  @return mixed
docstring_tokens: Returns a simple array of columns