CurtHagenlocher commented on code in PR #37885:
URL: https://github.com/apache/arrow/pull/37885#discussion_r1342720126


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csharp/src/Apache.Arrow/Arrays/ArrayDataConcatenator.cs:
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@@ -114,14 +107,15 @@ public void Visit(FixedSizeListType type)
             public void Visit(StructType type)
             {
                 CheckData(type, 1);
+                ArrowBuffer validityBuffer = ConcatenateValidityBuffer();

Review Comment:
   The test I added for concatenating Map is what caught this. I then modified 
the test for concatenating struct so that it was semantically correct and the 
new version would have caught this too.



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