pitrou commented on code in PR #45789:
URL: https://github.com/apache/arrow/pull/45789#discussion_r2003099005
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cpp/src/arrow/acero/groupby_aggregate_node.cc:
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@@ -312,7 +312,7 @@ Result<ExecBatch> GroupByNode::Finalize() {
segment_key_field_ids_.size());
// Segment keys come first
- PlaceFields(out_data, 0, segmenter_values_);
+ PlaceFields(out_data, 0, state->segmenter_values);
Review Comment:
Yes, that sounds reasonable. If we wanted to have multi-threaded segmented
group-by, I suppose it would need a preparatory step to rechunk the input along
segment boundaries?
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