zanmato1984 commented on code in PR #41125:
URL: https://github.com/apache/arrow/pull/41125#discussion_r1600388306
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cpp/src/arrow/acero/asof_join_node.cc:
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@@ -1464,11 +1525,13 @@ class AsofJoinNode : public ExecNode {
// Backpressure counter common to all inputs
std::atomic<int32_t> backpressure_counter_;
- // Queue for triggering processing of a given input
- // (a false value is a poison pill)
+// Queue for triggering processing of a given input
+// (a false value is a poison pill)
+#ifdef ARROW_ENABLE_THREADING
Review Comment:
nit: the comment should probably be enclosed by `#ifdef` as well.
##########
cpp/src/arrow/acero/asof_join_node.cc:
##########
@@ -1464,11 +1525,13 @@ class AsofJoinNode : public ExecNode {
// Backpressure counter common to all inputs
std::atomic<int32_t> backpressure_counter_;
- // Queue for triggering processing of a given input
- // (a false value is a poison pill)
+// Queue for triggering processing of a given input
+// (a false value is a poison pill)
+#ifdef ARROW_ENABLE_THREADING
Review Comment:
```suggestion
#ifdef ARROW_ENABLE_THREADING
// Queue for triggering processing of a given input
// (a false value is a poison pill)
```
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