[doris] 29/38: [performance](group_concat) avoid extra copy in group_concat (#21880)

[morningman]

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morningman pushed a commit to branch branch-1.2-lts
in repository https://gitbox.apache.org/repos/asf/doris.git

commit 85b077e32c54af01e247c22b2762ff0acfe1cf9a
Author: Mryange <59914473+mrya...@users.noreply.github.com>
AuthorDate: Tue Jul 18 00:02:26 2023 +0800

    [performance](group_concat) avoid extra copy in group_concat (#21880)
    
    pick from #21432
---
 be/src/vec/aggregate_functions/aggregate_function_group_concat.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/be/src/vec/aggregate_functions/aggregate_function_group_concat.h 
b/be/src/vec/aggregate_functions/aggregate_function_group_concat.h
index 33c83fc7b0..fde7ef864d 100644
--- a/be/src/vec/aggregate_functions/aggregate_function_group_concat.h
+++ b/be/src/vec/aggregate_functions/aggregate_function_group_concat.h
@@ -58,7 +58,7 @@ struct AggregateFunctionGroupConcatData {
         }
     }
 
-    std::string get() const { return data; }
+    const std::string& get() const { return data; }
 
     void write(BufferWritable& buf) const {
         write_binary(data, buf);
@@ -132,7 +132,7 @@ public:
     }
 
     void insert_result_into(ConstAggregateDataPtr __restrict place, IColumn& 
to) const override {
-        std::string result = this->data(place).get();
+        const std::string& result = this->data(place).get();
         static_cast<ColumnString&>(to).insert_data(result.c_str(), 
result.length());
     }
 };


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