[Bug 63973] New: writing 3000 columns with Cell Merge and 2 rows for SXSSFWorkbook and XSSFWorkbook very slowly

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[Bug 63973] New: writing 3000 columns with Cell Merge and 2 rows for SXSSFWorkbook and XSSFWorkbook very slowly

Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=63973

            Bug ID: 63973
           Summary: writing 3000 columns with Cell Merge and 2 rows for
                    SXSSFWorkbook and XSSFWorkbook very slowly
           Product: POI
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: SXSSF
          Assignee: [hidden email]
          Reporter: [hidden email]
  Target Milestone: ---

My poi version is 4.0.0 and poi-ooxml version is 4.0.0. I try to write a excel
with 3000 merging columns and 2 rows. Each merging column has 3 columns. It
takes 19 minutes. It is very slow. I try SXSSFWorkbook and XSSFWorkbook. The
result is same.

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