felipecrv commented on code in PR #35514:
URL: https://github.com/apache/arrow/pull/35514#discussion_r1204876452


##########
cpp/src/arrow/engine/substrait/extension_set.cc:
##########
@@ -979,23 +981,22 @@ ExtensionIdRegistry::SubstraitAggregateToArrow 
DecodeBasicAggregate(
             options = std::make_shared<compute::VarianceOptions>(ddof);
           }
         }
-        fixed_arrow_func += arrow_function_name;
 
-        ARROW_ASSIGN_OR_RAISE(compute::Expression arg, call.GetValueArg(0));
-        const FieldRef* arg_ref = arg.field_ref();
-        if (!arg_ref) {
-          return Status::Invalid("Expected an aggregate call ", call.id().uri, 
"#",
-                                 call.id().name, " to have a direct 
reference");
+        fixed_arrow_func += arrow_function_name;

Review Comment:
   This line was glued to the previous block before it's part of the function 
name building process.



##########
cpp/src/arrow/engine/substrait/extension_set.cc:
##########
@@ -979,23 +981,22 @@ ExtensionIdRegistry::SubstraitAggregateToArrow 
DecodeBasicAggregate(
             options = std::make_shared<compute::VarianceOptions>(ddof);
           }
         }
-        fixed_arrow_func += arrow_function_name;
 
-        ARROW_ASSIGN_OR_RAISE(compute::Expression arg, call.GetValueArg(0));
-        const FieldRef* arg_ref = arg.field_ref();
-        if (!arg_ref) {
-          return Status::Invalid("Expected an aggregate call ", call.id().uri, 
"#",
-                                 call.id().name, " to have a direct 
reference");
+        fixed_arrow_func += arrow_function_name;
+        std::vector<FieldRef> target;
+        for (int i = 0; i < call.size(); i++) {
+          ARROW_ASSIGN_OR_RAISE(compute::Expression arg, call.GetValueArg(i));
+          const FieldRef* arg_ref = arg.field_ref();

Review Comment:
   Remove `const` so it can be moved below.



##########
cpp/src/arrow/engine/substrait/extension_set.cc:
##########
@@ -979,23 +981,22 @@ ExtensionIdRegistry::SubstraitAggregateToArrow 
DecodeBasicAggregate(
             options = std::make_shared<compute::VarianceOptions>(ddof);
           }
         }
-        fixed_arrow_func += arrow_function_name;
 
-        ARROW_ASSIGN_OR_RAISE(compute::Expression arg, call.GetValueArg(0));
-        const FieldRef* arg_ref = arg.field_ref();
-        if (!arg_ref) {
-          return Status::Invalid("Expected an aggregate call ", call.id().uri, 
"#",
-                                 call.id().name, " to have a direct 
reference");
+        fixed_arrow_func += arrow_function_name;
+        std::vector<FieldRef> target;
+        for (int i = 0; i < call.size(); i++) {
+          ARROW_ASSIGN_OR_RAISE(compute::Expression arg, call.GetValueArg(i));
+          const FieldRef* arg_ref = arg.field_ref();
+          if (!arg_ref) {
+            return Status::Invalid("Expected an aggregate call ", 
call.id().uri, "#",
+                                   call.id().name, " to have a direct 
reference");
+          }
+          target.emplace_back(std::move(*arg_ref));
         }
-
         return compute::Aggregate{std::move(fixed_arrow_func),
-                                  options ? std::move(options) : nullptr, 
*arg_ref, ""};
+                                  options ? std::move(options) : nullptr, 
target, ""};

Review Comment:
   Is `std::move(target)` possible here?



##########
cpp/src/arrow/engine/substrait/extension_set.cc:
##########
@@ -954,7 +954,9 @@ ExtensionIdRegistry::SubstraitAggregateToArrow 
DecodeBasicAggregate(
         return Status::Invalid("Expected aggregate call ", call.id().uri, "#",
                                call.id().name, " to have at least one 
argument");
       }
-      case 1: {
+      default: {

Review Comment:
   Yes



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