https://bz.apache.org/bugzilla/show_bug.cgi?id=65613

            Bug ID: 65613
           Summary: DeferredSXSSFWorkbook still using temp files
           Product: POI
           Version: 5.0.0-FINAL
          Hardware: PC
            Status: NEW
          Severity: major
          Priority: P2
         Component: SXSSF
          Assignee: dev@poi.apache.org
          Reporter: jasmin.su...@cpb-software.com
  Target Milestone: ---

Documentation of Version 5.0.0 (2021-01-20) claims:

"new experimental DeferredSXSSFWorkbook which avoids temp files by lazily
generating rows (see DeferredGeneration in poi-examples)"

However, writing a DeferredSXSSFWorkbook still causes temporary files to be
written to disk, as it still uses 
org.apache.poi.xssf.streaming.SXSSFWorkbook.write(OutputStream)

which does:

    //Save the template
    File tmplFile = TempFile.createTempFile("poi-sxssf-template", ".xlsx");


Is this a bug or intended?

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