rtpsw commented on code in PR #34392:
URL: https://github.com/apache/arrow/pull/34392#discussion_r1189772896
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cpp/src/arrow/acero/asof_join_node.cc:
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@@ -680,6 +816,7 @@ class InputState {
Result<bool> AdvanceAndMemoize(OnType ts) {
// Advance the right side row index until we reach the latest right row
(for each key)
// for the given left timestamp.
+ DEBUG_SYNC(node_, "Advancing input ", index_, DEBUG_MANIP(std::endl));
Review Comment:
Note that there are a
[couple](https://github.com/apache/arrow/pull/34392/commits/85328512f4899ca92ce5404f442036f54d6ab3ee#diff-5493b6ae7ea2a4d5cfb581034c076e9c4be7608382168de6d1301ef67b6c01eeR1331)
of
[examples](https://github.com/apache/arrow/pull/34392/commits/85328512f4899ca92ce5404f442036f54d6ab3ee#diff-5493b6ae7ea2a4d5cfb581034c076e9c4be7608382168de6d1301ef67b6c01eeR1681)
where `std::endl` is used in the middle of a message, so `DEBUG_MANIP` would
be useful even if we had `DEBUG_SYNC_LINE`.
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