def apply(row, offset)
      row.hidden = @filter.apply(row.cells[offset+col_id.to_i])
    end
def apply(row, offset)
      row.hidden = @filter.apply(row.cells[offset+col_id.to_i])
    end
Apply the filters for this column
 @param [Array] row A row from a worksheet that needs to be
 filtered.