joosthooz commented on a change in pull request #12609:
URL: https://github.com/apache/arrow/pull/12609#discussion_r838527580
##########
File path: cpp/src/arrow/util/thread_pool.cc
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@@ -58,6 +60,19 @@ SerialExecutor::~SerialExecutor() = default;
Status SerialExecutor::SpawnReal(TaskHints hints, FnOnce<void()> task,
StopToken stop_token, StopCallback&&
stop_callback) {
+#ifdef ARROW_WITH_OPENTELEMETRY
+ // Wrap the task to propagate a parent tracing span to it
+ struct {
+ void operator()() {
+ auto scope =
::arrow::internal::tracing::GetTracer()->WithActiveSpan(activeSpan);
+ std::move(func)();
+ }
+ FnOnce<void()> func;
+ opentelemetry::nostd::shared_ptr<opentelemetry::trace::Span> activeSpan;
+ } wrapper{std::forward<FnOnce<void()>>(task),
Review comment:
I changed this, and the equivalent in `future.cc`, into `std::move`
(which is also used in another task wrapper I saw in `future.cc`)
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