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+1  Q: 

How to groupColumn in .xlsx files using POI 3.6 ?

Hello,

I recently switched from POI 3.1 (HSSF) to POI 3.6 (XSSF) and encountered a problem.

The problem is that the groupColumn no longer works as expected!

Does anyone know why the column grouping works properly only BEFORE writing in the cells from the worksheet and does not work well AFTER the worksheet is written?

Is there a way to group columns on an xlsx file after writing data in the column's cells?

Thank you very much,
Gabriela

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