CurtHagenlocher commented on code in PR #41539:
URL: https://github.com/apache/arrow/pull/41539#discussion_r1597487812


##########
csharp/src/Apache.Arrow/Arrays/PrimitiveArray.cs:
##########
@@ -86,5 +86,30 @@ IEnumerator IEnumerable.GetEnumerator()
                 yield return IsValid(index) ? Values[index] : null;
             }
         }
+
+        int ICollection<T?>.Count => Length;
+        bool ICollection<T?>.IsReadOnly => true;
+        void ICollection<T?>.Add(T? item) => throw new 
NotSupportedException("Collection is read-only.");
+        bool ICollection<T?>.Remove(T? item) => throw new 
NotSupportedException("Collection is read-only.");
+        void ICollection<T?>.Clear() => throw new 
NotSupportedException("Collection is read-only.");
+
+        bool ICollection<T?>.Contains(T? item)

Review Comment:
   I think all the types where this matters should implement IEquatable<T>; the 
set of types supported by Arrow is effectively closed. That said, this is still 
potentially a breaking change if someone is using PrimitiveArray to implement a 
non-Arrow type but the workaround is fairly straightforward.



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