diff --git a/be/src/runtime/workload_group/workload_group_manager.cpp b/be/src/runtime/workload_group/workload_group_manager.cpp
index 8d6547a053ce9db..735bba09617e977 100644
--- a/be/src/runtime/workload_group/workload_group_manager.cpp
+++ b/be/src/runtime/workload_group/workload_group_manager.cpp
@@ -281,17 +281,6 @@ void WorkloadGroupMgr::get_wg_resource_usage(vectorized::Block* block) {
         nullable_column->get_null_map_data().emplace_back(0);
     };
 
-    auto insert_string_value = [&](int col_index, std::string str_val, vectorized::Block* block) {
-        vectorized::MutableColumnPtr mutable_col_ptr;
-        mutable_col_ptr = std::move(*block->get_by_position(col_index).column).assume_mutable();
-        auto* nullable_column =
-                reinterpret_cast<vectorized::ColumnNullable*>(mutable_col_ptr.get());
-        vectorized::IColumn* col_ptr = &nullable_column->get_nested_column();
-        reinterpret_cast<vectorized::ColumnString*>(col_ptr)->insert_data(str_val.data(),
-                                                                          str_val.size());
-        nullable_column->get_null_map_data().emplace_back(0);
-    };
-
     int64_t be_id = ExecEnv::GetInstance()->master_info()->backend_id;
     int cpu_num = CpuInfo::num_cores();
     cpu_num = cpu_num <= 0 ? 1 : cpu_num;