dblink_write implement [FEAT MERGE]

Co-authored-by: zzg19950727 <1071026277@qq.com>
Co-authored-by: xianyu-w <707512433@qq.com>

src/sql/optimizer/ob_delete_log_plan.h

@@ -29,10 +29,12 @@ public:
     : ObDelUpdLogPlan(ctx, delete_stmt)
   {}
   virtual ~ObDeleteLogPlan() {}
-  virtual int generate_raw_plan() override;
   const ObDeleteStmt *get_stmt() const override
   { return reinterpret_cast<const ObDeleteStmt*>(stmt_); }
 
+protected:
+  virtual int generate_normal_raw_plan() override;
+
 private:
   DISALLOW_COPY_AND_ASSIGN(ObDeleteLogPlan);
   // 分配普通delete计划的delete log operator