[scn] fix failure of mittest after refresh feature scn

src/sql/optimizer/ob_log_temp_table_access.h

@@ -45,9 +45,6 @@ public:
                                        int64_t &buf_len,
                                        int64_t &pos,
                                        ExplainType type);
-
-  int get_temp_table_plan(ObLogicalOperator *& insert_op);
-
 private:
   DISALLOW_COPY_AND_ASSIGN(ObLogTempTableAccess);