def max_number(self, rows: List[Row], column: NumberColumn) -> Number:
        """
        Takes a list of rows and a column and returns the max of the values under that column in
        those rows.
        """
        cell_values = [row.values[column.name] for row in rows]
        if not cell_values:
            return 0.0  # type: ignore
        if not all([isinstance(value, Number) for value in cell_values]):
            raise ExecutionError(f"Invalid values for number selection function: {cell_values}")
        return max(cell_values)
Takes a list of rows and a column and returns the max of the values under that column in
        those rows.