TangSiyang2001 commented on code in PR #15339:
URL: https://github.com/apache/doris/pull/15339#discussion_r1112109843


##########
be/src/vec/aggregate_functions/aggregate_function_collect.h:
##########
@@ -202,27 +266,36 @@ class AggregateFunctionCollect final
     }
 
     DataTypePtr get_return_type() const override {
-        return std::make_shared<DataTypeArray>(make_nullable(_argument_type));
+        return std::make_shared<DataTypeArray>(make_nullable(return_type));
     }
 
+    bool allocates_memory_in_arena() const override { return ENABLE_ARENA; }
+
     void add(AggregateDataPtr __restrict place, const IColumn** columns, 
size_t row_num,
              Arena* arena) const override {
-        assert(!columns[0]->is_null_at(row_num));
-        if constexpr (alloc_memory_in_arena) {
-            this->data(place).add(*columns[0], row_num, arena);
+        auto& data = this->data(place);
+        if constexpr (HasLimit::value) {
+            data.max_size =
+                    (UInt64) static_cast<const 
ColumnInt32*>(columns[1])->get_element(row_num);

Review Comment:
   May you specify it please?  Thanks a lot.



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