For work with big data sheets in Apache POI uses SXSSF objects.
Goal of SXSSF implementation is write very large spreadsheets with low memory footprint.
If i try fill template with 500 000 rows and 30 cols with transformer created like
PoiTransformer.createSxssfTransformer(workbook, 10, true)
when CellRef objects will eat up all the memory.
CellData are stored in list - "targetPos". I found one place where "targetPos" are used it is calculation of formula range.
This approach makes it unnecessary to use SxssfTransformer