rtpsw commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1117548525
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cpp/src/arrow/compute/exec/aggregate_node.cc:
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@@ -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());
+ KernelContext kernel_ctx{exec_ctx};
+ RETURN_NOT_OK(Kernel::InitAll(
+ &kernel_ctx, KernelInitArgs{kernels_[i], in_types,
aggs_[i].options.get()},
+ &states_[i]));
+ }
+ return Status::OK();
+ }
+
+ Status OutputResult(bool is_last = false, bool traced = false) {
+ if (is_last && !traced) {
+ auto scope = TraceFinish();
+ return OutputResult(is_last, /*traced=*/true);
Review Comment:
This code-block will be removed. To answer the question, the function
constructs a tracing scope and then calls itself recursively, so that when it
returns the scope is deconstructed.
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