lidavidm commented on code in PR #14395:
URL: https://github.com/apache/arrow/pull/14395#discussion_r1012902083
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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:
What is the context? If it's only a couple callsites, we could manually
stringify the optional
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