pub fn get_cols(
ws: &WorksheetXml,
sst: &SharedStringTable,
) -> Result<Vec<(String, Vec<(u32, CellValue)>)>>Expand description
Get all columns with their data from a worksheet.
Returns a Vec of (column_name, Vec<(row_number, CellValue)>) tuples.
Only columns that have data are included (sparse). The columns are sorted
by column order (A, B, …, Z, AA, AB, …).