Imitate same behaviour as worksheet.rows
Created originally on Bitbucket by chuckus (Charlie Smith)
Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.
worksheet.rows will start at row 0, so
worksheet.columns should do the same thing. Infact, if
worksheet.columns is called prior to
worksheet.rows, it will only return contain rows that have values. The behaviour changes to every row after
worksheet.rows is called.