icexelloss commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1117325015


##########
cpp/src/arrow/compute/exec/aggregate_node.cc:
##########
@@ -326,46 +446,86 @@ class ScalarAggregateNode : public ExecNode, public 
TracedNode {
   }
 
  private:
-  Status Finish() {
-    auto scope = TraceFinish();
+  Status ReconstructAggregates() {
+    const auto& input_schema = *inputs()[0]->output_schema();
+    auto exec_ctx = plan()->query_context()->exec_context();
+    for (size_t i = 0; i < kernels_.size(); ++i) {
+      std::vector<TypeHolder> in_types;
+      for (const auto& target : target_fieldsets_[i]) {
+        in_types.emplace_back(input_schema.field(target)->type().get());
+      }
+      states_[i].resize(plan()->query_context()->max_concurrency());

Review Comment:
   Why is state resized to max_concurrency here?



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