rtpsw commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1122287793
##########
cpp/src/arrow/compute/exec/options.h:
##########
@@ -199,21 +199,39 @@ class ARROW_EXPORT ProjectNodeOptions : public
ExecNodeOptions {
std::vector<std::string> names;
};
-/// \brief Make a node which aggregates input batches, optionally grouped by
keys.
+/// \brief Make a node which aggregates input batches, optionally grouped by
keys and
+/// optionally segmented by segment-keys. Both keys and segment-keys determine
the group.
+/// However segment-keys are also used for determining grouping segments,
which should be
+/// large, and allow streaming a partial aggregation result after processing
each segment.
Review Comment:
Sounds right.
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