ArianaVillegas commented on a change in pull request #12031:
URL: https://github.com/apache/arrow/pull/12031#discussion_r774809343
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File path: cpp/src/arrow/compute/exec/exec_plan.cc
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@@ -157,11 +157,46 @@ struct ExecPlanImpl : public ExecPlan {
return std::move(Impl{nodes_}.sorted);
}
+ std::pair<NodeVector, std::vector<int>> OrderedNodes() const {
+ struct Impl {
+ const std::vector<std::unique_ptr<ExecNode>>& nodes;
+ std::unordered_set<ExecNode*> visited;
+ NodeVector sorted;
+ std::vector<int> indents;
+
+ explicit Impl(const std::vector<std::unique_ptr<ExecNode>>& nodes) :
nodes(nodes) {
+ visited.reserve(nodes.size());
+
+ for (auto it = nodes.rbegin(); it != nodes.rend(); ++it) {
+ if (visited.count(it->get()) != 0) return;
+ Visit(it->get());
+ }
+
+ DCHECK_EQ(visited.size(), nodes.size());
+ }
+
+ void Visit(ExecNode* node, int indent = 0) {
+ for (auto input : node->inputs()) {
+ Visit(input, indent + 1);
+ }
+
+ indents.push_back(indent);
+ sorted.push_back(node);
+ visited.insert(node);
+ }
+ };
+
+ auto result = Impl{nodes_};
Review comment:
I think it is not necessary because the function OrderedNodes() is a
variant of TopoSort (), so with that, it should reflect the direction of data
flow.
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