milesgranger commented on code in PR #14395:
URL: https://github.com/apache/arrow/pull/14395#discussion_r1012900184
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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:
Is there a better place to put it, or a different fix?
> error: no match for 'operator<<' (operand types are 'std::ostream' {aka
'std::basic_ostream<char>'} and 'const std::optional<long int>')
49 | stream << head;
| ~~~~~~~^~~~~~~
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