pitrou commented on a change in pull request #11032:
URL: https://github.com/apache/arrow/pull/11032#discussion_r728976850
##########
File path: cpp/src/arrow/compute/exec/exec_plan.h
##########
@@ -407,5 +407,13 @@ std::shared_ptr<RecordBatchReader> MakeGeneratorReader(
std::shared_ptr<Schema>,
std::function<Future<util::optional<ExecBatch>>()>,
MemoryPool*);
+constexpr int kDefaultBackgroundMaxQ = 32;
+constexpr int kDefaultBackgroundQRestart = 16;
+
+ARROW_EXPORT
+Result<std::function<Future<util::optional<ExecBatch>>()>> MakeReaderGenerator(
Review comment:
Can you add a docstring here?
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