icexelloss commented on code in PR #34627:
URL: https://github.com/apache/arrow/pull/34627#discussion_r1150655031


##########
cpp/src/arrow/engine/substrait/options.cc:
##########
@@ -166,6 +171,57 @@ class DefaultExtensionProvider : public 
BaseExtensionProvider {
                                      named_tap_rel.name(), 
std::move(renamed_schema)));
     return RelationInfo{{std::move(decl), std::move(renamed_schema)}, 
std::nullopt};
   }
+
+  Result<RelationInfo> MakeSegmentedAggregateRel(
+      const ConversionOptions& conv_opts, const std::vector<DeclarationInfo>& 
inputs,
+      const substrait_ext::SegmentedAggregateRel& seg_agg_rel,
+      const ExtensionSet& ext_set) {
+    if (inputs.size() != 1) {

Review Comment:
   I still don't think we fully understand. SegmentedAggregateRel is wrapped 
inside a ExtensionSingleRel so it can only have one input. Do you put this 
check here to prevent producer to put SegmentedAggregateRel  inside a 
ExtensionMultiRel? 



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