lidavidm commented on a change in pull request #12662:
URL: https://github.com/apache/arrow/pull/12662#discussion_r830326024
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File path: cpp/src/arrow/util/async_generator.h
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@@ -60,6 +60,9 @@ namespace arrow {
// Readahead operators, and some other operators, may introduce queueing. Any
operators
// that introduce buffering should detail the amount of buffering they
introduce in their
// MakeXYZ function comments.
+//
+// A generator should always be fully consumed before it is destroyed.
+// A generator should not emit a terminal item until it has finished all
ongoing futures.
Review comment:
Yeah, that makes sense to me.
I meant 'seeing the future (of whether the future will complete)' which…I'll
stop there before I get more confused.
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