gitmodimo commented on code in PR #44083:
URL: https://github.com/apache/arrow/pull/44083#discussion_r1825726301


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cpp/src/arrow/acero/source_node.cc:
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@@ -406,7 +407,7 @@ struct SchemaSourceNode : public SourceNode {
 struct RecordBatchReaderSourceNode : public SourceNode {
   RecordBatchReaderSourceNode(ExecPlan* plan, std::shared_ptr<Schema> schema,
                               arrow::AsyncGenerator<std::optional<ExecBatch>> 
generator)
-      : SourceNode(plan, schema, generator) {}
+      : SourceNode(plan, schema, generator, Ordering::Implicit()) {}

Review Comment:
   It does not. I assumed that when user provides a generator,  it has some 
kind of implicot order.  Now I see it is not necessarily a case. 



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