milesgranger commented on code in PR #14395:
URL: https://github.com/apache/arrow/pull/14395#discussion_r1015386822


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cpp/src/arrow/util/string_builder.h:
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@@ -44,6 +45,11 @@ class ARROW_EXPORT StringStreamWrapper {
 
 }  // namespace detail
 
+template <typename T>
+std::ostream& operator<<(std::ostream& os, std::optional<T> const& opt) {

Review Comment:
   @lidavidm in my C++ naivety, I've ran out of ideas on where to move this or 
if there is a different way to solve it. 



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