zanmato1984 commented on code in PR #45789:
URL: https://github.com/apache/arrow/pull/45789#discussion_r2002688419


##########
cpp/src/arrow/acero/scalar_aggregate_node.cc:
##########
@@ -240,8 +240,8 @@ Status ScalarAggregateNode::InputReceived(ExecNode* input, 
ExecBatch batch) {
     // We add segment to the current segment group aggregation
     auto exec_batch = full_batch.Slice(segment.offset, segment.length);
     RETURN_NOT_OK(DoConsume(ExecSpan(exec_batch), thread_index));
-    RETURN_NOT_OK(
-        ExtractSegmenterValues(&segmenter_values_, exec_batch, 
segment_field_ids_));
+    RETURN_NOT_OK(ExtractSegmenterValues(&GetLocalState()->segmenter_values, 
exec_batch,
+                                         segment_field_ids_));

Review Comment:
   It is weird and I may even withdraw this fix. Please wait for my answer for 
the other comment (it's long and I'm still writing). Thank you. 



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