[Bug 64633] New: [PATCH] Support of function TEXTJOIN

https://bz.apache.org/bugzilla/show_bug.cgi?id=64633

            Bug ID: 64633
           Summary: [PATCH] Support of function TEXTJOIN
           Product: POI
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: SS Common
          Assignee: [hidden email]
          Reporter: [hidden email]
  Target Milestone: ---

Created attachment 37377
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=37377&action=edit
Implementation of TEXTJOIN

TEXTJOIN was added to Excel in 2016.  It's used to concatenate strings with a
specified delimiter, and to optionally exclude arguments evaluating as empty:

https://support.microsoft.com/en-us/office/textjoin-function-357b449a-ec91-49d0-80c3-0e8fc845691c

The attached patch adds support for the TEXTJOIN function, as well as a suite
of unit tests for it.

First time submitting a POI patch, so please let me know if I've done something
incorrectly and I'm happy to fix it!  Specifically, I wasn't sure the best way
to bind the new function class to the function name, so I cribbed off another
patch that added a new function via a binding in
AnalysisToolPak.createFunctionsMap.

The patch was created against trunk, but for my own project's use, I've applied
it back to 4.1.2, and that seems to work fine as well.

See also bug 60924.  I filed this separately in the interest of an easy merge
since that one is a fairly old open bug with many functions listed, but if it's
better to include it in there, that works too.

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