def fetchmany(self, size=None):
        """
        Fetch the next set of rows of a query result, returning a sequence of sequences
        (e.g. a list of tuples). An empty sequence is returned when no more rows are
        available. The number of rows to fetch per call is specified by the parameter.
        If it is not given, the cursor's arraysize determines the number of rows to be
        fetched. The method should try to fetch as many rows as indicated by the size
        parameter. If this is not possible due to the specified number of rows not being
        available, fewer rows may be returned. An :py:class:`~pyhive.exc.Error`
        (or subclass) exception is raised if the previous call to
        :py:meth:`execute` did not produce any result set or no call was issued yet.
        """
        if size is None:
            size = self.arraysize
        result = []
        for _ in range(size):
            one = self.fetchone()
            if one is None:
                break
            else:
                result.append(one)
        return result
Fetch the next set of rows of a query result, returning a sequence of sequences
        (e.g. a list of tuples). An empty sequence is returned when no more rows are
        available. The number of rows to fetch per call is specified by the parameter.
        If it is not given, the cursor's arraysize determines the number of rows to be
        fetched. The method should try to fetch as many rows as indicated by the size
        parameter. If this is not possible due to the specified number of rows not being
        available, fewer rows may be returned. An :py:class:`~pyhive.exc.Error`
        (or subclass) exception is raised if the previous call to
        :py:meth:`execute` did not produce any result set or no call was issued yet.