def is_leader_span_cell(cell):
    """ Return true if cell is the first(leader) span cell.
    Consider following table, There are 4 "cells" in each row.
    Pay attention to 4 cells in row 2.
    +-------------+------+-------+--------+
    |  Baskets    | 2    | 17.99 | 35.98  |
    +-------------+------+-------+--------+
    | Subtotal                   | 610.88 |
    +----------------------------+--------+
        ^            ^        ^
        |            |        |
     leader      continue    continue
    span cell    span cell   span cell
    """
    return cell.cell_type.startswith('span') and cell.data is not None
