original_string: public function fetchColumn($sql, array $params = array(), $pos = 0)
      {
          return $this->run($sql, $params)->fetchColumn($pos);
      }
code: public function fetchColumn($sql, array $params = array(), $pos = 0)
      {
          return $this->run($sql, $params)->fetchColumn($pos);
      }
code_tokens: public function fetchColumn ( $ sql , array $ params = array ( ) , $ pos = 0 ) { return $ this -> run ( $ sql , $ params ) -> fetchColumn ( $ pos ) ; }
docstring: Returns a single column
  @param string $sql
  @param array $params
  @param integer $pos
  @return mixed
docstring_tokens: Returns a single column