diff --git a/cpp/src/groupby/sort/aggregate.cpp b/cpp/src/groupby/sort/aggregate.cpp
index 83c6c1bca57..7bce5a3e0fa 100644
--- a/cpp/src/groupby/sort/aggregate.cpp
+++ b/cpp/src/groupby/sort/aggregate.cpp
@@ -117,14 +117,22 @@ void aggregate_result_functor::operator()<aggregation::ARGMAX>(aggregation const
 {
   if (cache.has_result(values, agg)) return;
 
-  cache.add_result(values,
-                   agg,
-                   detail::group_argmax(get_grouped_values(),
-                                        helper.num_groups(stream),
-                                        helper.group_labels(stream),
-                                        helper.key_sort_order(stream),
-                                        stream,
-                                        mr));
+  auto result = values.type().id() == type_id::STRUCT
+                  ? detail::group_argminmax_struct(aggregation::ARGMAX,
+                                                   get_grouped_values(),
+                                                   helper.num_groups(stream),
+                                                   helper.group_labels(stream),
+                                                   helper.key_sort_order(stream),
+                                                   stream,
+                                                   mr)
+                  : detail::group_argmax(get_grouped_values(),
+                                         helper.num_groups(stream),
+                                         helper.group_labels(stream),
+                                         helper.key_sort_order(stream),
+                                         stream,
+                                         mr);
+
+  cache.add_result(values, agg, std::move(result));
 };
 
 template <>
@@ -132,14 +140,22 @@ void aggregate_result_functor::operator()<aggregation::ARGMIN>(aggregation const
 {
   if (cache.has_result(values, agg)) return;
 
-  cache.add_result(values,
-                   agg,
-                   detail::group_argmin(get_grouped_values(),
-                                        helper.num_groups(stream),
-                                        helper.group_labels(stream),
-                                        helper.key_sort_order(stream),
-                                        stream,
-                                        mr));
+  auto result = values.type().id() == type_id::STRUCT
+                  ? detail::group_argminmax_struct(aggregation::ARGMIN,
+                                                   get_grouped_values(),
+                                                   helper.num_groups(stream),
+                                                   helper.group_labels(stream),
+                                                   helper.key_sort_order(stream),
+                                                   stream,
+                                                   mr)
+                  : detail::group_argmin(get_grouped_values(),
+                                         helper.num_groups(stream),
+                                         helper.group_labels(stream),
+                                         helper.key_sort_order(stream),
+                                         stream,
+                                         mr);
+
+  cache.add_result(values, agg, std::move(result));
 };
 
 template <>
diff --git a/cpp/src/groupby/sort/scan.cpp b/cpp/src/groupby/sort/scan.cpp
index b22f82ce7e4..eed6bd52faf 100644
--- a/cpp/src/groupby/sort/scan.cpp
+++ b/cpp/src/groupby/sort/scan.cpp
@@ -81,11 +81,18 @@ void scan_result_functor::operator()<aggregation::MIN>(aggregation const& agg)
 {
   if (cache.has_result(values, agg)) return;
 
-  cache.add_result(
-    values,
-    agg,
-    detail::min_scan(
-      get_grouped_values(), helper.num_groups(stream), helper.group_labels(stream), stream, mr));
+  auto result =
+    values.type().id() == type_id::STRUCT
+      ? detail::minmax_scan_struct(aggregation::MIN,
+                                   get_grouped_values(),
+                                   helper.num_groups(stream),
+                                   helper.group_labels(stream),
+                                   stream,
+                                   mr)
+      : detail::min_scan(
+          get_grouped_values(), helper.num_groups(stream), helper.group_labels(stream), stream, mr);
+
+  cache.add_result(values, agg, std::move(result));
 }
 
 template <>
@@ -93,11 +100,18 @@ void scan_result_functor::operator()<aggregation::MAX>(aggregation const& agg)
 {
   if (cache.has_result(values, agg)) return;
 
-  cache.add_result(
-    values,
-    agg,
-    detail::max_scan(
-      get_grouped_values(), helper.num_groups(stream), helper.group_labels(stream), stream, mr));
+  auto result =
+    values.type().id() == type_id::STRUCT
+      ? detail::minmax_scan_struct(aggregation::MAX,
+                                   get_grouped_values(),
+                                   helper.num_groups(stream),
+                                   helper.group_labels(stream),
+                                   stream,
+                                   mr)
+      : detail::max_scan(
+          get_grouped_values(), helper.num_groups(stream), helper.group_labels(stream), stream, mr);
+
+  cache.add_result(values, agg, std::move(result));
 }
 
 template <>