diff --git a/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.cpp b/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.cpp
index 979c630554..436aefbdc6 100644
--- a/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.cpp
+++ b/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.cpp
@@ -36,11 +36,9 @@ int ObPDMLOpRowIterator::get_next_row(const ObExprPtrIArray &row)
     if (OB_ISNULL(eval_ctx_)) {
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("not init the eval_ctx", K(ret));
-    } else if (OB_SUCC(row_store_it_.get_next_row(row, *eval_ctx_))) {
-      // we should do uniq row checking after data being stored in row_store
-      // rather than before this. because we need to return all rows unfiltered to upper ops.
-      if (uniq_row_checker_) {
-        ret = uniq_row_checker_->check_rowkey_distinct(row, is_distinct);
+    } else if (OB_FAIL(row_store_it_.get_next_row(row, *eval_ctx_))) {
+      if (OB_ITER_END != ret) {
+        LOG_WARN("get next row from row store iter failed", K(ret));
       }
     }
   } while (OB_SUCC(ret) && !is_distinct);
diff --git a/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.h b/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.h
index d14a18414e..44d538b9f0 100644
--- a/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.h
+++ b/src/sql/engine/pdml/static/ob_pdml_op_batch_row_cache.h
@@ -29,12 +29,6 @@ class ObNewRow;
 namespace sql
 {
 struct ObDASTabletLoc;
-class ObDMLOpUniqueRowChecker
-{
-public:
-  virtual int check_rowkey_distinct(const ObExprPtrIArray &row, bool &is_distinct) = 0;
-};
-
 class ObExecContext;
 
 // 单个分区的新引擎数据缓存器
@@ -42,22 +36,18 @@ class ObPDMLOpRowIterator
 {
 public:
     friend class ObPDMLOpBatchRowCache;
-    ObPDMLOpRowIterator() : eval_ctx_(nullptr), uniq_row_checker_(nullptr) {}
+    ObPDMLOpRowIterator() : eval_ctx_(nullptr) {}
     virtual ~ObPDMLOpRowIterator() = default;
     // 获得row_store_it_中的下一行数据
     // 返回的数据是对应存储数据的exprs
     int get_next_row(const ObExprPtrIArray &row);
-    void set_uniq_row_checker(ObDMLOpUniqueRowChecker *uniq_row_checker)
-    { uniq_row_checker_ = uniq_row_checker; }
-    void close()
-    { row_store_it_.reset(); }
+    void close() { row_store_it_.reset(); }
 private:
     int init_data_source(ObChunkDatumStore &row_datum_store,
                          ObEvalCtx *eval_ctx);
 private:
   ObChunkDatumStore::Iterator row_store_it_;
   ObEvalCtx *eval_ctx_;
-  ObDMLOpUniqueRowChecker *uniq_row_checker_;
   DISALLOW_COPY_AND_ASSIGN(ObPDMLOpRowIterator);
 };
 
@@ -132,7 +122,8 @@ public:
   // 一般来说，分区id存储在行中的一个伪列里
   virtual int read_row(ObExecContext &ctx,
                        const ObExprPtrIArray *&row,
-                       common::ObTabletID &tablet_id) = 0;
+                       common::ObTabletID &tablet_id,
+                       bool &is_skipped) = 0;
 };
 
 class ObDMLOpDataWriter
diff --git a/src/sql/engine/pdml/static/ob_pdml_op_data_driver.cpp b/src/sql/engine/pdml/static/ob_pdml_op_data_driver.cpp
index fbba1eb6c9..a513185d37 100644
--- a/src/sql/engine/pdml/static/ob_pdml_op_data_driver.cpp
+++ b/src/sql/engine/pdml/static/ob_pdml_op_data_driver.cpp
@@ -35,7 +35,6 @@ int ObPDMLOpDataDriver::init(const ObTableModifySpec &spec,
                              ObDMLBaseRtDef &dml_rtdef,
                              ObDMLOpDataReader *reader,
                              ObDMLOpDataWriter *writer,
-                             ObDMLOpUniqueRowChecker *uniq_checker,
                              const bool is_heap_table_insert,
                              const bool with_barrier/*false*/)
 {
@@ -53,7 +52,6 @@ int ObPDMLOpDataDriver::init(const ObTableModifySpec &spec,
   } else {
     reader_ = reader;
     writer_ = writer;
-    uniq_checker_ = uniq_checker;
     dml_rtdef_ = &dml_rtdef;
     is_heap_table_insert_ = is_heap_table_insert;
     with_barrier_ = with_barrier;
@@ -179,13 +177,16 @@ int ObPDMLOpDataDriver::fill_cache_unitl_cache_full_or_child_iter_end(ObExecCont
     do {
       const ObExprPtrIArray *row = nullptr;
       ObTabletID tablet_id;
-      if (OB_FAIL(reader_->read_row(ctx, row, tablet_id))) {
+      bool is_skipped = false;
+      if (OB_FAIL(reader_->read_row(ctx, row, tablet_id, is_skipped))) {
         if (OB_ITER_END == ret) {
           // 当前reader的数据已经读取结束
           // do nothing
         } else {
           LOG_WARN("failed to read row from reader", K(ret));
         }
+      } else if (is_skipped) {
+        //need to skip this row
       } else if (is_heap_table_insert_ && OB_FAIL(set_heap_table_hidden_pk(row, tablet_id))) {
         LOG_WARN("fail to set heap table hidden pk", K(ret), K(*row), K(tablet_id));
       } else if (OB_FAIL(cache_.add_row(*row, tablet_id))) {
@@ -247,8 +248,6 @@ int ObPDMLOpDataDriver::write_partitions(ObExecContext &ctx)
         LOG_WARN("fail get row iterator", K(tablet_id), K(ret));
       } else if (OB_FAIL(DAS_CTX(ctx).extended_tablet_loc(*table_loc, tablet_id, tablet_loc))) {
         LOG_WARN("extended tablet location failed", K(ret));
-      } else if (FALSE_IT(row_iter->set_uniq_row_checker(uniq_checker_))) {
-        // nop
       } else if (OB_FAIL(writer_->write_rows(ctx, tablet_loc, *row_iter))) {
         LOG_WARN("fail write rows", K(tablet_id), K(ret));
       }
@@ -392,7 +391,6 @@ int ObPDMLOpDataDriver::switch_row_iter_to_next_partition()
     LOG_WARN("failed to get next partition iterator", K(ret),
         "part_id", returning_ctx_.tablet_id_array_.at(next_idx), K(next_idx));
   } else {
-    returning_ctx_.row_iter_->set_uniq_row_checker(nullptr);
     returning_ctx_.next_idx_++;
   }
   return ret;
diff --git a/src/sql/engine/pdml/static/ob_pdml_op_data_driver.h b/src/sql/engine/pdml/static/ob_pdml_op_data_driver.h
index dfd57f742d..1e404b66f1 100644
--- a/src/sql/engine/pdml/static/ob_pdml_op_data_driver.h
+++ b/src/sql/engine/pdml/static/ob_pdml_op_data_driver.h
@@ -40,7 +40,6 @@ public:
       cache_(eval_ctx, op_monitor_info),
       reader_(nullptr),
       writer_(nullptr),
-      uniq_checker_(nullptr),
       dml_rtdef_(nullptr),
       state_(FILL_CACHE),
       eval_ctx_(eval_ctx),
@@ -61,7 +60,6 @@ public:
            ObDMLBaseRtDef &dml_rtdef,
            ObDMLOpDataReader *reader,
            ObDMLOpDataWriter *writer,
-           ObDMLOpUniqueRowChecker *uniq_checker,
            const bool is_heap_table_insert,
            const bool with_barrier = false);
 
@@ -143,7 +141,6 @@ private:
   ObPDMLOpBatchRowCache cache_; // 用于缓存数据，需要在init函数中初始化，并且分配alloctor
   ObDMLOpDataReader *reader_;
   ObDMLOpDataWriter *writer_;
-  ObDMLOpUniqueRowChecker *uniq_checker_;
   ObDMLBaseRtDef *dml_rtdef_;
   DriverState state_; // Driver 当前状态：读写数据状态、向上返回数据状态
 
diff --git a/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.cpp b/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.cpp
index e832c48377..9db86bc3fe 100644
--- a/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.cpp
+++ b/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.cpp
@@ -65,7 +65,7 @@ int ObPxMultiPartDeleteOp::inner_open()
     LOG_WARN("failed to inner open", K(ret));
   } else if (OB_FAIL(ObDMLService::init_del_rtdef(dml_rtctx_, del_rtdef_, MY_SPEC.del_ctdef_))) {
     LOG_WARN("init delete rtdef failed", K(ret));
-  } else if (OB_FAIL(data_driver_.init(get_spec(), ctx_.get_allocator(), del_rtdef_, this, this, this, false, MY_SPEC.with_barrier_))) {
+  } else if (OB_FAIL(data_driver_.init(get_spec(), ctx_.get_allocator(), del_rtdef_, this, this, false, MY_SPEC.with_barrier_))) {
     LOG_WARN("failed to init data driver", K(ret));
   } else if (MY_SPEC.with_barrier_) {
     if (OB_ISNULL(input_)) {
@@ -81,24 +81,6 @@ int ObPxMultiPartDeleteOp::inner_open()
   return ret;
 }
 
-int ObPxMultiPartDeleteOp::check_rowkey_distinct(const ObExprPtrIArray &row,
-                                                 bool &is_distinct)
-{
-  int ret = OB_SUCCESS;
-  if (DistinctType::T_DISTINCT_NONE != MY_SPEC.del_ctdef_.distinct_algo_) {
-    ret = ObDMLService::check_rowkey_whether_distinct(row,
-                                                      MY_SPEC.del_ctdef_.distinct_algo_,
-                                                      eval_ctx_,
-                                                      ctx_,
-                                                      del_rtdef_.table_rowkey_,
-                                                      del_rtdef_.se_rowkey_dist_ctx_,
-                                                      is_distinct);
-  } else {
-    is_distinct = true;
-  }
-  return ret;
-}
-
 int ObPxMultiPartDeleteOp::inner_get_next_row()
 {
   int ret = OB_SUCCESS;
@@ -149,7 +131,8 @@ int ObPxMultiPartDeleteOp::inner_close()
 //////////// pdml data interface implementation: reader & writer ////////////
 int ObPxMultiPartDeleteOp::read_row(ObExecContext &ctx,
                                     const ObExprPtrIArray *&row,
-                                    ObTabletID &tablet_id)
+                                    ObTabletID &tablet_id,
+                                    bool &is_skipped)
 {
   int ret = OB_SUCCESS;
   UNUSED(ctx);
@@ -164,24 +147,28 @@ int ObPxMultiPartDeleteOp::read_row(ObExecContext &ctx,
   } else {
     // 每一次从child节点获得新的数据都需要进行清除计算标记
     clear_evaluated_flag();
-    // 通过partition id expr获得对应行对应的分区
-    const int64_t part_id_idx = MY_SPEC.row_desc_.get_part_id_index();
-    // 返回的值是child的output exprs
-    row = &child_->get_spec().output_;
-    if (NO_PARTITION_ID_FLAG == part_id_idx) {
-      // 如果row中没有partition id expr对应的cell，默认partition id为0
-      ObDASTableLoc *table_loc = del_rtdef_.das_rtdef_.table_loc_;
-      if (OB_ISNULL(table_loc) || table_loc->get_tablet_locs().size() != 1) {
-        ret = OB_ERR_UNEXPECTED;
-        LOG_WARN("insert table location is invalid", K(ret), KPC(table_loc));
-      } else {
-        tablet_id = table_loc->get_first_tablet_loc()->tablet_id_;
+    if (OB_FAIL(ObDMLService::process_delete_row(MY_SPEC.del_ctdef_, del_rtdef_, is_skipped, *this))) {
+      LOG_WARN("process delete row failed", K(ret));
+    } else if (!is_skipped) {
+      // 通过partition id expr获得对应行对应的分区
+      const int64_t part_id_idx = MY_SPEC.row_desc_.get_part_id_index();
+      // 返回的值是child的output exprs
+      row = &child_->get_spec().output_;
+      if (NO_PARTITION_ID_FLAG == part_id_idx) {
+        // 如果row中没有partition id expr对应的cell，默认partition id为0
+        ObDASTableLoc *table_loc = del_rtdef_.das_rtdef_.table_loc_;
+        if (OB_ISNULL(table_loc) || table_loc->get_tablet_locs().size() != 1) {
+          ret = OB_ERR_UNEXPECTED;
+          LOG_WARN("insert table location is invalid", K(ret), KPC(table_loc));
+        } else {
+          tablet_id = table_loc->get_first_tablet_loc()->tablet_id_;
+        }
+      } else if (child_->get_spec().output_.count() > part_id_idx) {
+        ObExpr *expr = child_->get_spec().output_.at(part_id_idx);
+        ObDatum &expr_datum = expr->locate_expr_datum(get_eval_ctx());
+        tablet_id = expr_datum.get_int();
+        LOG_DEBUG("get the part id", K(ret), K(expr_datum));
       }
-    } else if (child_->get_spec().output_.count() > part_id_idx) {
-      ObExpr *expr = child_->get_spec().output_.at(part_id_idx);
-      ObDatum &expr_datum = expr->locate_expr_datum(get_eval_ctx());
-      tablet_id = expr_datum.get_int();
-      LOG_DEBUG("get the part id", K(ret), K(expr_datum));
     }
   }
   return ret;
diff --git a/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.h b/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.h
index dae641309f..501a67c916 100644
--- a/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.h
+++ b/src/sql/engine/pdml/static/ob_px_multi_part_delete_op.h
@@ -76,7 +76,6 @@ public:
 
 class ObPxMultiPartDeleteOp : public ObDMLOpDataReader,
                             public ObDMLOpDataWriter,
-                            public ObDMLOpUniqueRowChecker,
                             public ObTableModifyOp
 {
   OB_UNIS_VERSION(1);
@@ -96,7 +95,8 @@ public:
   // 同时还负责计算出这一行对应的 partition_id
   int read_row(ObExecContext &ctx,
                const ObExprPtrIArray *&row,
-               common::ObTabletID &tablet_id) override;
+               common::ObTabletID &tablet_id,
+               bool &is_skipped) override;
   // impl. ObDMLDataWriter
   // 将缓存的数据批量写入到存储层
   int write_rows(ObExecContext &ctx,
@@ -107,9 +107,6 @@ public:
   virtual int inner_get_next_row();
   virtual int inner_open();
   virtual int inner_close();
-
-private:
-  int check_rowkey_distinct(const ObExprPtrIArray &row, bool &is_distinct) override;
 private:
   ObPDMLOpDataDriver data_driver_;
   ObDelRtDef del_rtdef_;
diff --git a/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.cpp b/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.cpp
index ef097295c4..6200051162 100644
--- a/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.cpp
+++ b/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.cpp
@@ -46,7 +46,7 @@ int ObPxMultiPartInsertOp::inner_open()
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("table or row desc is invalid", K(ret), K(MY_SPEC.row_desc_));
   } else if (OB_FAIL(data_driver_.init(get_spec(), ctx_.get_allocator(), ins_rtdef_, this, this,
-                                       nullptr, MY_SPEC.ins_ctdef_.is_heap_table_))) {
+                                       MY_SPEC.ins_ctdef_.is_heap_table_))) {
     LOG_WARN("failed to init data driver", K(ret));
   }
   if (OB_SUCC(ret)) {
@@ -126,28 +126,11 @@ int ObPxMultiPartInsertOp::inner_close()
   return ret;
 }
 
-int ObPxMultiPartInsertOp::process_row()
-{
-  int ret = OB_SUCCESS;
-  bool is_filtered = false;
-  OZ (ObDMLService::check_row_null(MY_SPEC.ins_ctdef_.new_row_,
-                                   eval_ctx_,
-                                   ins_rtdef_.cur_row_num_,
-                                   MY_SPEC.ins_ctdef_.column_infos_,
-                                   MY_SPEC.ins_ctdef_.das_ctdef_,
-                                   MY_SPEC.ins_ctdef_.is_single_value_,
-                                   *this));
-  OZ(ObDMLService::filter_row_for_view_check(MY_SPEC.ins_ctdef_.view_check_exprs_, eval_ctx_, is_filtered));
-  OV(!is_filtered, OB_ERR_CHECK_OPTION_VIOLATED);
-  OZ(ObDMLService::filter_row_for_check_cst(MY_SPEC.ins_ctdef_.check_cst_exprs_, eval_ctx_, is_filtered));
-  OV(!is_filtered, OB_ERR_CHECK_CONSTRAINT_VIOLATED);
-  return ret;
-}
-
 //////////// pdml data interface implementation: reader & writer ////////////
 int ObPxMultiPartInsertOp::read_row(ObExecContext &ctx,
                                     const ObExprPtrIArray *&row,
-                                    common::ObTabletID &tablet_id)
+                                    common::ObTabletID &tablet_id,
+                                    bool &is_skipped)
 {
   int ret = OB_SUCCESS;
   UNUSED(ctx);
@@ -162,32 +145,31 @@ int ObPxMultiPartInsertOp::read_row(ObExecContext &ctx,
   } else {
     // 每一次从child节点获得新的数据都需要进行清除计算标记
     clear_evaluated_flag();
-    // 通过partition id expr获得对应行对应的分区
-    const int64_t part_id_idx = MY_SPEC.row_desc_.get_part_id_index();
-    // 返回的值是child的output exprs
-    row = &child_->get_spec().output_;
-    if (NO_PARTITION_ID_FLAG == part_id_idx) {
-      ObDASTableLoc *table_loc = ins_rtdef_.das_rtdef_.table_loc_;
-      if (OB_ISNULL(table_loc) || table_loc->get_tablet_locs().size() != 1) {
-        ret = OB_ERR_UNEXPECTED;
-        LOG_WARN("insert table location is invalid", K(ret), KPC(table_loc));
-      } else {
-        tablet_id = table_loc->get_first_tablet_loc()->tablet_id_;
+    if (OB_FAIL(ObDMLService::process_insert_row(MY_SPEC.ins_ctdef_, ins_rtdef_, *this, is_skipped))) {
+      LOG_WARN("process insert row failed", K(ret));
+    } else if (!is_skipped) {
+      // 通过partition id expr获得对应行对应的分区
+      const int64_t part_id_idx = MY_SPEC.row_desc_.get_part_id_index();
+      // 返回的值是child的output exprs
+      row = &child_->get_spec().output_;
+      if (NO_PARTITION_ID_FLAG == part_id_idx) {
+        ObDASTableLoc *table_loc = ins_rtdef_.das_rtdef_.table_loc_;
+        if (OB_ISNULL(table_loc) || table_loc->get_tablet_locs().size() != 1) {
+          ret = OB_ERR_UNEXPECTED;
+          LOG_WARN("insert table location is invalid", K(ret), KPC(table_loc));
+        } else {
+          tablet_id = table_loc->get_first_tablet_loc()->tablet_id_;
+        }
+      } else if (child_->get_spec().output_.count() > part_id_idx) {
+        ObExpr *expr = child_->get_spec().output_.at(part_id_idx);
+        ObDatum &expr_datum = expr->locate_expr_datum(get_eval_ctx());
+        tablet_id = expr_datum.get_int();
+        LOG_DEBUG("get the part id", K(ret), K(expr_datum));
       }
-    } else if (child_->get_spec().output_.count() > part_id_idx) {
-      ObExpr *expr = child_->get_spec().output_.at(part_id_idx);
-      ObDatum &expr_datum = expr->locate_expr_datum(get_eval_ctx());
-      tablet_id = expr_datum.get_int();
-      LOG_DEBUG("get the part id", K(ret), K(expr_datum));
-    }
-  }
-  if (!MY_SPEC.is_pdml_index_maintain_ && OB_SUCC(ret)) {
-    if (OB_FAIL(process_row())) {
-      LOG_WARN("fail process row", K(ret));
     }
   }
   if (OB_SUCC(ret)) {
-    LOG_TRACE("read row from pdml cache", "read_row", ROWEXPR2STR(eval_ctx_, *row), K(tablet_id));
+    LOG_TRACE("read row from pdml cache", "read_row", ROWEXPR2STR(eval_ctx_, *row), K(tablet_id), K(is_skipped));
   }
   return ret;
 }
diff --git a/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.h b/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.h
index eac99d0ba8..6c7f4ffbd8 100644
--- a/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.h
+++ b/src/sql/engine/pdml/static/ob_px_multi_part_insert_op.h
@@ -93,7 +93,10 @@ public:
 public:
   virtual bool has_foreign_key() const  { return false; } // 默认实现，先不考虑外键的问题
 
-  int read_row(ObExecContext &ctx, const ObExprPtrIArray *&row, common::ObTabletID &tablet_id) override;
+  int read_row(ObExecContext &ctx,
+               const ObExprPtrIArray *&row,
+               common::ObTabletID &tablet_id,
+               bool &is_skipped) override;
   int write_rows(ObExecContext &ctx,
                  const ObDASTabletLoc *tablet_loc,
                  ObPDMLOpRowIterator &iterator) override;
@@ -101,8 +104,6 @@ public:
   virtual int inner_get_next_row();
   virtual int inner_open();
   virtual int inner_close();
-private:
-  int process_row();
 protected:
   ObPDMLOpDataDriver data_driver_;
   ObInsRtDef ins_rtdef_;
diff --git a/src/sql/engine/pdml/static/ob_px_multi_part_update_op.cpp b/src/sql/engine/pdml/static/ob_px_multi_part_update_op.cpp
index 47d180905e..eee919ab46 100644
--- a/src/sql/engine/pdml/static/ob_px_multi_part_update_op.cpp
+++ b/src/sql/engine/pdml/static/ob_px_multi_part_update_op.cpp
@@ -36,8 +36,7 @@ int ObPxMultiPartUpdateOp::inner_open()
   } else if (!(MY_SPEC.row_desc_.is_valid())) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("table or row desc is invalid", K(ret), K(MY_SPEC.row_desc_));
-  } else if (OB_FAIL(data_driver_.init(get_spec(), ctx_.get_allocator(), upd_rtdef_, this, this,
-                                       nullptr, false))) {
+  } else if (OB_FAIL(data_driver_.init(get_spec(), ctx_.get_allocator(), upd_rtdef_, this, this, false))) {
     LOG_WARN("failed to init data driver", K(ret));
   } else if (OB_FAIL(ObDMLService::init_upd_rtdef(dml_rtctx_,
                                                   upd_rtdef_,
@@ -100,17 +99,9 @@ int ObPxMultiPartUpdateOp::inner_close()
 int ObPxMultiPartUpdateOp::update_row_to_das(const ObDASTabletLoc *tablet_loc)
 {
   int ret = OB_SUCCESS;
-  bool is_skipped = false;
   ObChunkDatumStore::StoredRow* stored_row = nullptr;
-  ++upd_rtdef_.cur_row_num_;
-  if (OB_FAIL(ObDMLService::process_update_row(MY_SPEC.upd_ctdef_, upd_rtdef_, is_skipped, *this))) {
-    LOG_WARN("process update row failed", K(ret));
-  } else if (is_skipped) {
-    //do nothing
-  } else if (OB_FAIL(ObDMLService::update_row(MY_SPEC.upd_ctdef_, upd_rtdef_, tablet_loc, tablet_loc, dml_rtctx_, stored_row, stored_row, stored_row))) {
+  if (OB_FAIL(ObDMLService::update_row(MY_SPEC.upd_ctdef_, upd_rtdef_, tablet_loc, tablet_loc, dml_rtctx_, stored_row, stored_row, stored_row))) {
     LOG_WARN("insert row with das failed", K(ret));
-  } else {
-    ++upd_rtdef_.found_rows_;
   }
   return ret;
 }
@@ -118,12 +109,12 @@ int ObPxMultiPartUpdateOp::update_row_to_das(const ObDASTabletLoc *tablet_loc)
 //////////// pdml data interface implementation: reader & writer ////////////
 int ObPxMultiPartUpdateOp::read_row(ObExecContext &ctx,
                                     const ObExprPtrIArray *&row,
-                                    common::ObTabletID &tablet_id)
+                                    common::ObTabletID &tablet_id,
+                                    bool &is_skipped)
 {
   // 从child中读取数据，数据存储在child的output exprs中
   int ret = OB_SUCCESS;
   ObPhysicalPlanCtx *plan_ctx = NULL;
-  bool is_update_timestamp = false;
   if (OB_ISNULL(plan_ctx = ctx.get_physical_plan_ctx())) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("get physical plan context failed", K(ret));
@@ -137,78 +128,34 @@ int ObPxMultiPartUpdateOp::read_row(ObExecContext &ctx,
   } else {
     // 每一次从child节点获得新的数据都需要进行清除计算标记
     clear_evaluated_flag();
-    // 通过partition id expr获得对应行对应的分区
-    const int64_t part_id_idx = MY_SPEC.row_desc_.get_part_id_index();
-    // 返回的值是child的output exprs
-    row = &child_->get_spec().output_;
-    if (NO_PARTITION_ID_FLAG == part_id_idx) {
-      ObDASTableLoc *table_loc = upd_rtdef_.dupd_rtdef_.table_loc_;
-      if (OB_ISNULL(table_loc) || table_loc->get_tablet_locs().size() != 1) {
-        ret = OB_ERR_UNEXPECTED;
-        LOG_WARN("insert table location is invalid", K(ret), KPC(table_loc));
-      } else {
-        tablet_id = table_loc->get_first_tablet_loc()->tablet_id_;
-      }
-    } else if (child_->get_spec().output_.count() > part_id_idx) {
-      ObExpr *expr = child_->get_spec().output_.at(part_id_idx);
-      ObDatum &expr_datum = expr->locate_expr_datum(get_eval_ctx());
-      tablet_id = expr_datum.get_int();
-      LOG_DEBUG("get the part id", K(ret), K(expr_datum));
-    }
-
-    // 做auto_failed_timestamp的检查
-    // 如果assign_column包含了ON UPDATE CURRENT_TIMESTAMP类型的时间戳列
-    // 第一步先检查主表是否发生update，如果主表当前行没有发生update，那么吧old_row中的当前列拷贝到new_row中
-    // pdml的索引表在检查当前行是否发生update时，不会跳过ON UPDATE CURRENT_TIMESTAMP列，会比较value
-    if (MY_SPEC.upd_ctdef_.is_primary_index_
-        && lib::is_mysql_mode()
-        && is_update_auto_filled_timestamp()) {
-      // update the timestamp column, then check whether row is updated
-      if (OB_FAIL(ObDMLService::check_row_whether_changed(MY_SPEC.upd_ctdef_, upd_rtdef_, get_eval_ctx()))) {
-        LOG_WARN("fail to check_row_whether_changed", K(ret));
-      } else if (!upd_rtdef_.is_row_changed_) {
-        // copy old_row timestamp column as new_row timestamp column
-        const ObExprPtrIArray &old_row = MY_SPEC.upd_ctdef_.old_row_;
-        const ObExprPtrIArray &new_row = MY_SPEC.upd_ctdef_.new_row_;
-        FOREACH_CNT_X(info, MY_SPEC.upd_ctdef_.assign_columns_, OB_SUCC(ret)) {
-          const uint64_t idx = info->projector_index_;
-          if (info->auto_filled_timestamp_) {
-            ObDatum *old_datum = NULL;
-            ObDatum *new_datum = NULL;
-            if (OB_FAIL(old_row.at(idx)->eval(get_eval_ctx(), old_datum))
-                || OB_FAIL(new_row.at(idx)->eval(get_eval_ctx(), new_datum))) {
-              LOG_WARN("evaluate value failed", K(ret));
-            } else if (OB_ISNULL(old_datum) || OB_ISNULL(new_datum)) {
-              ret = OB_ERR_UNEXPECTED;
-              LOG_WARN("datum is null, unexpected", K(ret), KPC(old_datum), KPC(new_datum));
-            } else {
-              new_row.at(idx)->locate_datum_for_write(get_eval_ctx()) = *old_datum;
-              new_row.at(idx)->set_evaluated_projected(get_eval_ctx());
-            }
-            LOG_TRACE("after copy timestamp column to new_row", K(ret), K(idx),
-                      "old_row", ROWEXPR2STR(get_eval_ctx(), old_row),
-                      "new_row", ROWEXPR2STR(get_eval_ctx(), new_row));
-          }
+    ++upd_rtdef_.cur_row_num_;
+    if (OB_FAIL(ObDMLService::process_update_row(MY_SPEC.upd_ctdef_, upd_rtdef_, is_skipped, *this))) {
+      LOG_WARN("process update row failed", K(ret));
+    } else if (!is_skipped) {
+      // 通过partition id expr获得对应行对应的分区
+      ++upd_rtdef_.found_rows_;
+      const int64_t part_id_idx = MY_SPEC.row_desc_.get_part_id_index();
+      // 返回的值是child的output exprs
+      row = &child_->get_spec().output_;
+      if (NO_PARTITION_ID_FLAG == part_id_idx) {
+        ObDASTableLoc *table_loc = upd_rtdef_.dupd_rtdef_.table_loc_;
+        if (OB_ISNULL(table_loc) || table_loc->get_tablet_locs().size() != 1) {
+          ret = OB_ERR_UNEXPECTED;
+          LOG_WARN("insert table location is invalid", K(ret), KPC(table_loc));
+        } else {
+          tablet_id = table_loc->get_first_tablet_loc()->tablet_id_;
         }
+      } else if (child_->get_spec().output_.count() > part_id_idx) {
+        ObExpr *expr = child_->get_spec().output_.at(part_id_idx);
+        ObDatum &expr_datum = expr->locate_expr_datum(get_eval_ctx());
+        tablet_id = expr_datum.get_int();
+        LOG_DEBUG("get the part id", K(ret), K(expr_datum));
       }
     }
-
   }
   return ret;
 }
 
-bool ObPxMultiPartUpdateOp::is_update_auto_filled_timestamp()
-{
-  bool updated = false;
-  FOREACH_CNT_X(info, MY_SPEC.upd_ctdef_.assign_columns_, !updated) {
-    const uint64_t idx = info->projector_index_;
-    if (info->auto_filled_timestamp_) {
-      updated = true;
-    }
-  }
-  return updated;
-}
-
 
 int ObPxMultiPartUpdateOp::write_rows(ObExecContext &ctx,
                                       const ObDASTabletLoc *tablet_loc,
diff --git a/src/sql/engine/pdml/static/ob_px_multi_part_update_op.h b/src/sql/engine/pdml/static/ob_px_multi_part_update_op.h
index 2864fc32e9..d6cd4cbed0 100644
--- a/src/sql/engine/pdml/static/ob_px_multi_part_update_op.h
+++ b/src/sql/engine/pdml/static/ob_px_multi_part_update_op.h
@@ -79,14 +79,13 @@ public:
 public:
   int read_row(ObExecContext &ctx,
                const ObExprPtrIArray *&row,
-               common::ObTabletID &tablet_id) override;
+               common::ObTabletID &tablet_id,
+               bool &is_skipped) override;
 
   int write_rows(ObExecContext &ctx,
                  const ObDASTabletLoc *tablet_loc,
                  ObPDMLOpRowIterator &iterator) override;
 
-  bool is_update_auto_filled_timestamp();
-
   virtual int inner_get_next_row();
   virtual int inner_open();
   virtual int inner_close();
diff --git a/src/sql/optimizer/ob_del_upd_log_plan.cpp b/src/sql/optimizer/ob_del_upd_log_plan.cpp
index 68167752b0..8a6c3b1a7e 100644
--- a/src/sql/optimizer/ob_del_upd_log_plan.cpp
+++ b/src/sql/optimizer/ob_del_upd_log_plan.cpp
@@ -264,8 +264,8 @@ int ObDelUpdLogPlan::check_table_rowkey_distinct(
       if (OB_ISNULL(index_dml_info)) {
         ret = OB_ERR_UNEXPECTED;
         LOG_WARN("index dml info is null", K(ret));
-      } else if (!use_pdml() && !index_dml_info->is_primary_index_) {
-        // for PDML, primary table & index table both need unique checker.
+      } else if (!index_dml_info->is_primary_index_) {
+        // only primary table need unique checker.
       } else if (OB_FAIL(index_dml_info->get_rowkey_exprs(rowkey_exprs))) {
         LOG_WARN("failed to get rowkey exprs", K(ret));
       } else if (OB_FAIL(ObOptimizerUtil::is_exprs_unique(rowkey_exprs,