icexelloss commented on code in PR #34627:
URL: https://github.com/apache/arrow/pull/34627#discussion_r1150640663


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cpp/src/arrow/engine/substrait/relation_internal.cc:
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@@ -293,6 +303,90 @@ Status DiscoverFilesFromDir(const 
std::shared_ptr<fs::LocalFileSystem>& local_fs
   return Status::OK();
 }
 
+namespace internal {

Review Comment:
   Actually I see what you are doing here - these two methods are not "API" 
methods in the same sense that the other "FromProto" methods are and takes a 
lot of internal parameters. 
   
   We can leave as is. But can you put a comment about how the methods here are 
different from the rest of the methods here. I didn't understand why do meant 
by "Called sparsely" - but I guess you mean that "these two methods are only 
meant to be used inside FromProto of AggregationRel and 
SegementedAggregationRel"?
   



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