fix TextJoin use case that was not handled

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1892070 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 6 insertions, 2 deletions

diff --git a/poi/src/main/java/org/apache/poi/ss/formula/atp/TextJoinFunction.java b/poi/src/main/java/org/apache/poi/ss/formula/atp/TextJoinFunction.java
index 8cd588715a..85a527261f 100644
--- a/poi/src/main/java/org/apache/poi/ss/formula/atp/TextJoinFunction.java
+++ b/poi/src/main/java/org/apache/poi/ss/formula/atp/TextJoinFunction.java
@@ -96,14 +96,14 @@ final class TextJoinFunction implements FreeRefFunction {
             if (delimiterArgs.size() == 0) {
                 return new StringEval(String.join("", textValues));
             } else if (delimiterArgs.size() == 1) {
-                String delimiter = OperandResolver.coerceValueToString(delimiterArgs.get(0));
+                String delimiter = coerceValueToString(delimiterArgs.get(0));
                 return new StringEval(String.join(delimiter, textValues));
             } else {
                 //https://support.microsoft.com/en-us/office/textjoin-function-357b449a-ec91-49d0-80c3-0e8fc845691c
                 //see example 3 to see why this is needed
                 List<String> delimiters = new ArrayList<>();
                 for (ValueEval delimiterArg: delimiterArgs) {
-                    delimiters.add(OperandResolver.coerceValueToString(delimiterArg));
+                    delimiters.add(coerceValueToString(delimiterArg));
                 }
                 StringBuilder sb = new StringBuilder();
                 for (int i = 0; i < textValues.size(); i++) {
@@ -120,6 +120,10 @@ final class TextJoinFunction implements FreeRefFunction {
         }
     }
 
+    private String coerceValueToString(ValueEval eval) {
+        return  (eval instanceof MissingArgEval) ? "" : OperandResolver.coerceValueToString(eval);
+    }
+
     //https://support.microsoft.com/en-us/office/textjoin-function-357b449a-ec91-49d0-80c3-0e8fc845691c
     //in example 3, the delimiter is defined by a large area but only the last row of that area seems to be used
     //this is why lastRowOnly is supported