ahsanabbas123 commented on code in PR #48792:
URL: https://github.com/apache/arrow/pull/48792#discussion_r2676139782


##########
cpp/src/arrow/engine/substrait/expression_internal.cc:
##########
@@ -1249,42 +1249,52 @@ Result<std::unique_ptr<substrait::Expression>> 
MakeListElementReference(
 Result<std::unique_ptr<substrait::Expression::ScalarFunction>> 
EncodeSubstraitCall(
     const SubstraitCall& call, ExtensionSet* ext_set,
     const ConversionOptions& conversion_options) {
+
+  auto scalar_fn =
+      std::make_unique<substrait::Expression::ScalarFunction>();
+
+  // Encode function ONCE per scalar function (FIX)

Review Comment:
   Can you please explain how does constructing the scalar function before 
encoding the call help avoid the repeated URIs as the rest of the changes seem 
to be just formatting? 



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