original_string: public function fetchColumn($sql, $params = array(), $column = 0)
      {
          return $this->query($sql, $params)->fetchColumn($column);
      }
code: public function fetchColumn($sql, $params = array(), $column = 0)
      {
          return $this->query($sql, $params)->fetchColumn($column);
      }
code_tokens: public function fetchColumn ( $ sql , $ params = array ( ) , $ column = 0 ) { return $ this -> query ( $ sql , $ params ) -> fetchColumn ( $ column ) ; }
docstring: Executes a query and returns a column value of the first row
  
  @param string $sql The SQL query
  @param mixed $params The query parameters
  @param int $column The index of column
  @return string
docstring_tokens: Executes a query and returns a column value of the first row