diff --git a/be/src/vec/aggregate_functions/aggregate_function_collect.h b/be/src/vec/aggregate_functions/aggregate_function_collect.h
index ccb327226eec09..5c4988eca23ff1 100644
--- a/be/src/vec/aggregate_functions/aggregate_function_collect.h
+++ b/be/src/vec/aggregate_functions/aggregate_function_collect.h
@@ -399,15 +399,7 @@ struct AggregateFunctionArrayAggData {
     }
 
     void merge(const Self& rhs) {
-        const auto size = rhs.null_map->size();
-        null_map->resize(size);
-        nested_column->reserve(size);
-        for (size_t i = 0; i < size; i++) {
-            const auto null_value = rhs.null_map->data()[i];
-            const auto data_value = rhs.nested_column->get_data()[i];
-            null_map->data()[i] = null_value;
-            nested_column->get_data().push_back(data_value);
-        }
+        column_data->insert_range_from(*rhs.column_data, 0, rhs.column_data->size());
     }
 };
 
@@ -495,15 +487,7 @@ struct AggregateFunctionArrayAggData<StringRef> {
     }
 
     void merge(const Self& rhs) {
-        const auto size = rhs.null_map->size();
-        null_map->resize(size);
-        nested_column->reserve(size);
-        for (size_t i = 0; i < size; i++) {
-            const auto null_value = rhs.null_map->data()[i];
-            auto s = rhs.nested_column->get_data_at(i);
-            null_map->data()[i] = null_value;
-            nested_column->insert_data(s.data, s.size);
-        }
+        column_data->insert_range_from(*rhs.column_data, 0, rhs.column_data->size());
     }
 };