diff --git a/src/observer/mysql/ob_async_plan_driver.cpp b/src/observer/mysql/ob_async_plan_driver.cpp
index a2821665c2b2337e70cf241e05a266d0ac6f26d2..3e38fb119fb01b610515b749e1ee24ce82c79b8a 100644
--- a/src/observer/mysql/ob_async_plan_driver.cpp
+++ b/src/observer/mysql/ob_async_plan_driver.cpp
@@ -93,7 +93,7 @@ int ObAsyncPlanDriver::response_result(ObMySQLResultSet& result)
 
   if (!OB_SUCC(ret) && !async_resp_used && !retry_ctrl_.need_retry()) {
     int sret = OB_SUCCESS;
-    bool is_partition_hit = session_.partition_hit().get_bool();
+    bool is_partition_hit = session_.get_err_final_partition_hit(ret);
     if (OB_SUCCESS != (sret = sender_.send_error_packet(ret, NULL, is_partition_hit))) {
       LOG_WARN("send error packet fail", K(sret), K(ret));
     }
diff --git a/src/observer/mysql/ob_sync_plan_driver.cpp b/src/observer/mysql/ob_sync_plan_driver.cpp
index 81bf887b8adcee0c4d9a3ffe6b427ad87c5b2f67..34dc27892c84fd28b971754c5bd9329422b734bd 100644
--- a/src/observer/mysql/ob_sync_plan_driver.cpp
+++ b/src/observer/mysql/ob_sync_plan_driver.cpp
@@ -191,7 +191,7 @@ int ObSyncPlanDriver::response_result(ObMySQLResultSet& result)
       OB_BATCHED_MULTI_STMT_ROLLBACK != ret) {
     // if OB_BATCHED_MULTI_STMT_ROLLBACK is err ret of batch stmt rollback,not return to client, retry
     int sret = OB_SUCCESS;
-    bool is_partition_hit = session_.partition_hit().get_bool();
+    bool is_partition_hit = session_.get_err_final_partition_hit(ret);
     if (OB_SUCCESS != (sret = sender_.send_error_packet(ret, NULL, is_partition_hit))) {
       LOG_WARN("send error packet fail", K(sret), K(ret));
     }
@@ -433,7 +433,7 @@ int ObRemotePlanDriver::response_result(ObMySQLResultSet& result)
   if (!retry_ctrl_.need_retry()) {
     if (OB_FAIL(ret) && !process_ok) {
       int sret = OB_SUCCESS;
-      bool is_partition_hit = session_.partition_hit().get_bool();
+      bool is_partition_hit = session_.get_err_final_partition_hit(ret);
       if (OB_SUCCESS != (sret = sender_.send_error_packet(ret, NULL, is_partition_hit))) {
         LOG_WARN("send error packet fail", K(sret), K(ret));
       }
diff --git a/src/observer/mysql/obmp_query.cpp b/src/observer/mysql/obmp_query.cpp
index 9c608c044737e7aa30df14e799782a6dba879a99..37d3e8d1ba31ce9aba2f98e66a92046ba039f6a8 100644
--- a/src/observer/mysql/obmp_query.cpp
+++ b/src/observer/mysql/obmp_query.cpp
@@ -739,9 +739,13 @@ OB_INLINE int ObMPQuery::do_process(
         } else {
           LOG_WARN("query failed", K(ret), K(retry_ctrl_.need_retry()));
         }
-        bool is_partition_hit = session.partition_hit().get_bool();
-        int err = send_error_packet(ret, NULL, is_partition_hit, (void*)&ctx_.reroute_info_);
-        if (OB_SUCCESS != err) {
+        // 当need_retry=false时，可能给客户端回过包了，可能还没有回过任何包。
+        // 不过，可以确定：这个请求出错了，还没处理完。如果不是已经交给异步EndTrans收尾，
+        // 则需要在下面回复一个error_packet作为收尾。否则后面没人帮忙发错误包给客户端了，
+        // 可能会导致客户端挂起等回包。
+        bool is_partition_hit = session.get_err_final_partition_hit(ret);
+        int err = send_error_packet(ret, NULL, is_partition_hit, (void *)&ctx_.reroute_info_);
+        if (OB_SUCCESS != err) {  // 发送error包
           LOG_WARN("send error packet failed", K(ret), K(err));
         }
       }
diff --git a/src/observer/mysql/obmp_stmt_execute.cpp b/src/observer/mysql/obmp_stmt_execute.cpp
index 357da1f1adc4fb5cb06b93df70d9a25c831910c7..da2afef249bed67fd12cd279b4e135a2ef593b80 100644
--- a/src/observer/mysql/obmp_stmt_execute.cpp
+++ b/src/observer/mysql/obmp_stmt_execute.cpp
@@ -716,9 +716,13 @@ int ObMPStmtExecute::do_process(
             && !THIS_WORKER.need_retry()
             && !retry_ctrl_.need_retry()) {
           LOG_WARN("query failed", K(ret), K(retry_ctrl_.need_retry()), K_(stmt_id));
-          bool is_partition_hit = session.partition_hit().get_bool();
-          int err = send_error_packet(ret, NULL, is_partition_hit, (void*)(&ctx_.reroute_info_));
-          if (OB_SUCCESS != err) {
+          // 当need_retry=false时，可能给客户端回过包了，可能还没有回过任何包。
+          // 不过，可以确定：这个请求出错了，还没处理完。如果不是已经交给异步EndTrans收尾，
+          // 则需要在下面回复一个error_packet作为收尾。否则后面没人帮忙发错误包给客户端了，
+          // 可能会导致客户端挂起等回包。
+          bool is_partition_hit = session.get_err_final_partition_hit(ret);
+          int err = send_error_packet(ret, NULL, is_partition_hit, (void *)(&ctx_.reroute_info_));
+          if (OB_SUCCESS != err) {  // 发送error包
             LOG_WARN("send error packet failed", K(ret), K(err));
           }
         }
diff --git a/src/observer/mysql/obmp_stmt_prepare.cpp b/src/observer/mysql/obmp_stmt_prepare.cpp
index d900f76fbbce3649f04f4a9cdca324dad4191253..0a951247057b8eaeaf5342612778c92fe800cfbc 100644
--- a/src/observer/mysql/obmp_stmt_prepare.cpp
+++ b/src/observer/mysql/obmp_stmt_prepare.cpp
@@ -445,7 +445,11 @@ int ObMPStmtPrepare::do_process(
 
     if (!OB_SUCC(ret) && !async_resp_used && need_response_error && conn_valid_ && !THIS_WORKER.need_retry()) {
       LOG_WARN("query failed", K(ret), K(retry_ctrl_.need_retry()), K_(sql));
-      bool is_partition_hit = session.partition_hit().get_bool();
+      // 当need_retry=false时，可能给客户端回过包了，可能还没有回过任何包。
+      // 不过，可以确定：这个请求出错了，还没处理完。如果不是已经交给异步EndTrans收尾，
+      // 则需要在下面回复一个error_packet作为收尾。否则后面没人帮忙发错误包给客户端了，
+      // 可能会导致客户端挂起等回包。
+      bool is_partition_hit = session.get_err_final_partition_hit(ret);
       int err = send_error_packet(ret, NULL, is_partition_hit);
       if (OB_SUCCESS != err) {
         LOG_WARN("send error packet failed", K(ret), K(err));
diff --git a/src/sql/engine/expr/ob_expr_trim.cpp b/src/sql/engine/expr/ob_expr_trim.cpp
index 61729f54278ccd03fd9d3a11633c715a632b79ae..366bfb659f2345ec727ba7685dfbdd10dbbe5042 100644
--- a/src/sql/engine/expr/ob_expr_trim.cpp
+++ b/src/sql/engine/expr/ob_expr_trim.cpp
@@ -370,10 +370,15 @@ inline int ObExprTrim::deduce_result_type(
   if (lib::is_oracle_mode() && type_ctx.get_session()->use_static_typing_engine()) {
     auto str_params = make_const_carray(str_type);
     LOG_DEBUG("str_type is", K(str_type));
-    OZ(aggregate_string_type_and_charset_oracle(*type_ctx.get_session(), str_params, type, true));  // prefer varchar
-    OZ(deduce_string_param_calc_type_and_charset(*type_ctx.get_session(), type, str_params));
-    if (NULL != pattern_type) {
-      pattern_type->set_calc_meta(type);
+    if (str_type->is_null()) {
+      type.set_meta(*str_type);
+    } else {
+      OZ(aggregate_string_type_and_charset_oracle(*type_ctx.get_session(), str_params,
+                                                  type, true)); // prefer varchar
+      OZ(deduce_string_param_calc_type_and_charset(*type_ctx.get_session(), type, str_params));
+      if (OB_SUCC(ret) && NULL != pattern_type) {
+        pattern_type->set_calc_meta(type);
+      }
     }
   } else {
     if (str_type->is_lob()) {
@@ -389,6 +394,8 @@ inline int ObExprTrim::deduce_result_type(
       if (NULL != pattern_type) {
         pattern_type->set_calc_type(ObVarcharType);
       }
+    } else if (str_type->is_null()) {
+      type.set_meta(*str_type);
     } else {
       const common::ObLengthSemantics default_length_semantics =
           (OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics()
diff --git a/src/sql/engine/join/ob_basic_nested_loop_join.cpp b/src/sql/engine/join/ob_basic_nested_loop_join.cpp
index 477ec9c0d1df5cc5a22855533fc54165a47facba..b115713e501f81b83112047db9a044009a59f021 100644
--- a/src/sql/engine/join/ob_basic_nested_loop_join.cpp
+++ b/src/sql/engine/join/ob_basic_nested_loop_join.cpp
@@ -51,33 +51,41 @@ int ObBasicNestedLoopJoin::prepare_rescan_params(ObBasicNestedLoopJoinCtx& join_
 {
   int ret = OB_SUCCESS;
   ObObjParam res_obj;
-  ObPhysicalPlanCtx* plan_ctx = join_ctx.exec_ctx_.get_physical_plan_ctx();
-  if (OB_ISNULL(plan_ctx) || OB_ISNULL(join_ctx.left_row_)) {
+  ObPhysicalPlanCtx *plan_ctx = join_ctx.exec_ctx_.get_physical_plan_ctx();
+  ObPhyOperator *left_child = get_child(FIRST_CHILD);
+  ObPhyOperatorCtx *left_child_ctx = NULL;
+  if (OB_ISNULL(plan_ctx) || OB_ISNULL(join_ctx.left_row_) ||
+      OB_ISNULL(left_child)) {
     ret = OB_BAD_NULL_ERROR;
     LOG_WARN("plan ctx or left row is null", K(ret));
+  } else if (NULL ==
+             (left_child_ctx = static_cast<ObPhyOperatorCtx *>(
+                  join_ctx.exec_ctx_.get_phy_op_ctx(left_child->get_id())))) {
+    LOG_WARN("fail to get phy operator ctx", K(ret));
   } else {
     int64_t param_cnt = rescan_params_.count();
-    const ObSqlExpression* expr = NULL;
+    const ObSqlExpression *expr = NULL;
+    // rescan param need deep copy, because memory of expr result from calc_buf
+    // in ObPhyOperator, when get next row next time, will free memory in
+    // calc_buf; here we use left child calc_buf, because when left child need
+    // get next row, rescan param will not used;
     for (int64_t i = 0; OB_SUCC(ret) && i < param_cnt; ++i) {
+      int64_t idx = rescan_params_.at(i).param_idx_;
       if (OB_ISNULL(expr = rescan_params_.at(i).expr_)) {
         ret = OB_BAD_NULL_ERROR;
         LOG_WARN("rescan param expr is null", K(ret), K(i));
       } else if (OB_FAIL(expr->calc(join_ctx.expr_ctx_, *join_ctx.left_row_, res_obj))) {
         LOG_WARN("failed to calc expr for rescan param", K(ret), K(i));
       } else {
-        int64_t idx = rescan_params_.at(i).param_idx_;
         res_obj.set_param_meta();
-        plan_ctx->get_param_store_for_update().at(idx) = res_obj;
-        LOG_DEBUG("prepare_rescan_params",
-            K(ret),
-            K(i),
-            K(res_obj),
-            K(idx),
-            K(expr),
-            K(plan_ctx),
-            K(*join_ctx.left_row_),
-            K(*expr),
-            K(join_ctx.expr_ctx_.phy_plan_ctx_));
+        if (OB_FAIL(deep_copy_obj(
+                left_child_ctx->get_calc_buf(), res_obj,
+                plan_ctx->get_param_store_for_update().at(idx)))) {
+          LOG_WARN("fail to deep copy ", K(ret));
+        }
+        LOG_DEBUG("prepare_rescan_params", K(ret), K(i), K(res_obj), K(idx),
+                  K(expr), K(plan_ctx), K(*join_ctx.left_row_), K(*expr),
+                  K(join_ctx.expr_ctx_.phy_plan_ctx_));
       }
     }
   }
diff --git a/src/sql/engine/join/ob_nested_loop_join.cpp b/src/sql/engine/join/ob_nested_loop_join.cpp
index 0730c0228d12f4cc70779b9985b72960e2e13db2..5ab3395d39df01d3b1e0e32ab3ec1863cf21ece8 100644
--- a/src/sql/engine/join/ob_nested_loop_join.cpp
+++ b/src/sql/engine/join/ob_nested_loop_join.cpp
@@ -122,23 +122,35 @@ int ObNestedLoopJoin::switch_iterator(ObExecContext& ctx) const
   return ret;
 }
 
-int ObNestedLoopJoin::rescan(ObExecContext& exec_ctx) const
-{
+int ObNestedLoopJoin::reset_rescan_params(ObExecContext &ctx) const {
   int ret = OB_SUCCESS;
-  ObNestedLoopJoinCtx* join_ctx = GET_PHY_OPERATOR_CTX(ObNestedLoopJoinCtx, exec_ctx, get_id());
-  ObPhysicalPlanCtx* plan_ctx = exec_ctx.get_physical_plan_ctx();
-  if (OB_ISNULL(join_ctx) || OB_ISNULL(plan_ctx)) {
-    ret = OB_BAD_NULL_ERROR;
-    LOG_WARN("join ctx is null", K(ret));
+  ObPhysicalPlanCtx *plan_ctx = NULL;
+  if (OB_ISNULL(plan_ctx = GET_PHY_PLAN_CTX(ctx))) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("physical plan context is null", K(ret));
   } else {
-    join_ctx->reset();
-    int64_t param_cnt = rescan_params_.count();
-    for (int64_t i = 0; OB_SUCC(ret) && i < param_cnt; ++i) {
+    for (int64_t i = 0; i < rescan_params_.count(); ++i) {
       int64_t idx = rescan_params_.at(i).param_idx_;
       plan_ctx->get_param_store_for_update().at(idx).set_null();
-      LOG_DEBUG("prepare_rescan_params", K(ret), K(i), K(idx));
+      LOG_TRACE("prepare_rescan_params", K(ret), K(i), K(idx));
     }
-    if (OB_FAIL(ObBasicNestedLoopJoin::rescan(exec_ctx))) {
+  }
+
+  return ret;
+}
+
+int ObNestedLoopJoin::rescan(ObExecContext &exec_ctx) const {
+  int ret = OB_SUCCESS;
+  ObNestedLoopJoinCtx *join_ctx =
+      GET_PHY_OPERATOR_CTX(ObNestedLoopJoinCtx, exec_ctx, get_id());
+  if (OB_ISNULL(join_ctx)) {
+    ret = OB_BAD_NULL_ERROR;
+    LOG_WARN("join ctx is null", K(ret));
+  } else {
+    join_ctx->reset();
+    if (OB_FAIL(reset_rescan_params(exec_ctx))) {
+      LOG_WARN("fail to reset rescan params", K(ret));
+    } else if (OB_FAIL(ObBasicNestedLoopJoin::rescan(exec_ctx))) {
       LOG_WARN("failed to rescan", K(ret));
     }
   }
@@ -204,9 +216,16 @@ int ObNestedLoopJoin::inner_get_next_row(ObExecContext& exec_ctx, const ObNewRow
       LOG_WARN("copy current row failed", K(ret));
     }
   }
+  if (OB_ITER_END == ret) {
+    if (OB_FAIL(reset_rescan_params(exec_ctx))) {
+      LOG_WARN("fail to reset rescan params", K(ret));
+    } else {
+      ret = OB_ITER_END;
+    }
+  }
 
   if (OB_SUCC(ret)) {
-    LOG_DEBUG("get next row from nested loop join", K(*row));
+    LOG_TRACE("get next row from nested loop join", K(*row));
   }
   return ret;
 }
diff --git a/src/sql/engine/join/ob_nested_loop_join.h b/src/sql/engine/join/ob_nested_loop_join.h
index 9016c0673d26c92b591be59fccdee1cb5240fc61..9fab9dde7d67890bb12d7316e7dca7a40d8b5241 100644
--- a/src/sql/engine/join/ob_nested_loop_join.h
+++ b/src/sql/engine/join/ob_nested_loop_join.h
@@ -124,7 +124,9 @@ private:
   state_operation_func_type state_operation_func_[JS_STATE_COUNT];
   state_function_func_type state_function_func_[JS_STATE_COUNT][FT_TYPE_COUNT];
   // nested loop join with index seek, batch
-  int batch_index_join_get_next(ObExecContext& exec_ctx, const common::ObNewRow*& row) const;
+  int batch_index_join_get_next(ObExecContext &exec_ctx,
+                                const common::ObNewRow *&row) const;
+  int reset_rescan_params(ObExecContext &ctx) const;
 
 private:
   int bij_fill_left_rows(ObExecContext& exec_ctx) const;
diff --git a/src/sql/engine/join/ob_nested_loop_join_op.cpp b/src/sql/engine/join/ob_nested_loop_join_op.cpp
index 4a7052d4e19122c7795e2843359a0cf70423f15f..132f2139a59585dd99f0acd7204ec684b34b16f6 100644
--- a/src/sql/engine/join/ob_nested_loop_join_op.cpp
+++ b/src/sql/engine/join/ob_nested_loop_join_op.cpp
@@ -73,12 +73,25 @@ int ObNestedLoopJoinOp::switch_iterator()
   return ret;
 }
 
-int ObNestedLoopJoinOp::rescan()
-{
+int ObNestedLoopJoinOp::set_param_null() {
+  int ret = OB_SUCCESS;
+  ObDatum null_datum;
+  null_datum.set_null();
+  for (int64_t i = 0; OB_SUCC(ret) && i < MY_SPEC.rescan_params_.count(); ++i) {
+    OZ(MY_SPEC.rescan_params_.at(i).update_dynamic_param(eval_ctx_,
+                                                         null_datum));
+    LOG_DEBUG("prepare_rescan_params", K(ret), K(i));
+  }
+  return ret;
+}
+
+int ObNestedLoopJoinOp::rescan() {
   int ret = OB_SUCCESS;
   reset_buf_state();
-  ObPhysicalPlanCtx* plan_ctx = GET_PHY_PLAN_CTX(ctx_);
-  if (OB_FAIL(ObBasicNestedLoopJoinOp::rescan())) {
+  ObPhysicalPlanCtx *plan_ctx = GET_PHY_PLAN_CTX(ctx_);
+  if (OB_FAIL(set_param_null())) {
+    LOG_WARN("failed to set param null", K(ret));
+  } else if (OB_FAIL(ObBasicNestedLoopJoinOp::rescan())) {
     LOG_WARN("failed to rescan", K(ret));
   }
 
@@ -117,6 +130,13 @@ int ObNestedLoopJoinOp::inner_get_next_row()
       }
     }  // while end
   }
+  if (OB_ITER_END == ret) {
+    if (OB_FAIL(set_param_null())) {
+      LOG_WARN("failed to set param null", K(ret));
+    } else {
+      ret = OB_ITER_END;
+    }
+  }
 
   return ret;
 }
diff --git a/src/sql/engine/join/ob_nested_loop_join_op.h b/src/sql/engine/join/ob_nested_loop_join_op.h
index b48aaf6ac630fb3b90c51e839060c36564e30e83..cd02a8a51e0a980a2ca418cf45223ad552ca02f3 100644
--- a/src/sql/engine/join/ob_nested_loop_join_op.h
+++ b/src/sql/engine/join/ob_nested_loop_join_op.h
@@ -93,6 +93,7 @@ private:
   bool is_full() const;
   // used for rescan and switch iter
   virtual void reset_buf_state();
+  int set_param_null();
 
 public:
   ObJoinState state_;
diff --git a/src/sql/engine/subquery/ob_subplan_filter.cpp b/src/sql/engine/subquery/ob_subplan_filter.cpp
index 5b372858aacc77c79491b06e0b52672ca457cc21..1700e1230fd028a0f91e6c8e2ac943b6f5a597d2 100644
--- a/src/sql/engine/subquery/ob_subplan_filter.cpp
+++ b/src/sql/engine/subquery/ob_subplan_filter.cpp
@@ -204,25 +204,34 @@ void ObSubPlanFilter::reuse()
   ObMultiChildrenPhyOperator::reuse();
 }
 
-int ObSubPlanFilter::rescan(ObExecContext& ctx) const
-{
+int ObSubPlanFilter::reset_rescan_params(ObExecContext &ctx) const {
   int ret = OB_SUCCESS;
-  ObPhyOperator* child_op = NULL;
-  ObSubPlanFilterCtx* subplan_ctx = NULL;
-  ObPhysicalPlanCtx* plan_ctx = NULL;
-  if (OB_ISNULL(subplan_ctx = GET_PHY_OPERATOR_CTX(ObSubPlanFilterCtx, ctx, get_id())) ||
-      OB_ISNULL(plan_ctx = ctx.get_physical_plan_ctx())) {
+  ObPhysicalPlanCtx *plan_ctx = NULL;
+  if (OB_ISNULL(plan_ctx = GET_PHY_PLAN_CTX(ctx))) {
     ret = OB_ERR_UNEXPECTED;
-    LOG_WARN("get physical operator context failed", K(ret));
-  } else { /*do nothing*/
+    LOG_WARN("physical plan context is null", K(ret));
+  } else {
+    for (int64_t i = 0; i < rescan_params_.count(); ++i) {
+      int64_t idx = rescan_params_.at(i).second;
+      plan_ctx->get_param_store_for_update().at(idx).set_null();
+      LOG_TRACE("prepare_rescan_params", K(ret), K(i), K(idx));
+    }
   }
 
-  for (int64_t i = 0; OB_SUCC(ret) && i < rescan_params_.count(); ++i) {
-    int64_t idx = rescan_params_.at(i).second;
-    plan_ctx->get_param_store_for_update().at(idx).set_null();
-    LOG_DEBUG("prepare_rescan_params", K(ret), K(i), K(idx));
-  }
+  return ret;
+}
 
+int ObSubPlanFilter::rescan(ObExecContext &ctx) const {
+  int ret = OB_SUCCESS;
+  ObPhyOperator *child_op = NULL;
+  ObSubPlanFilterCtx *subplan_ctx = NULL;
+  if (OB_ISNULL(subplan_ctx =
+                    GET_PHY_OPERATOR_CTX(ObSubPlanFilterCtx, ctx, get_id()))) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("get physical operator context failed", K(ret));
+  } else if (OB_FAIL(reset_rescan_params(ctx))) {
+    LOG_WARN("fail to reset rescan params", K(ret));
+  }
   for (int32_t i = 1; OB_SUCC(ret) && i < get_child_num(); ++i) {
     if (OB_ISNULL(child_op = get_child(i))) {
       ret = OB_ERR_UNEXPECTED;
@@ -620,6 +629,13 @@ int ObSubPlanFilter::inner_get_next_row(ObExecContext& ctx, const ObNewRow*& row
       OZ(copy_cur_row(*subplan_ctx, row));
     }
   }
+  if (OB_ITER_END == ret) {
+    if (OB_FAIL(reset_rescan_params(ctx))) {
+      LOG_WARN("fail to reset rescan params", K(ret));
+    } else {
+      ret = OB_ITER_END;
+    }
+  }
 
   return ret;
 }
diff --git a/src/sql/engine/subquery/ob_subplan_filter.h b/src/sql/engine/subquery/ob_subplan_filter.h
index c1811ae6c072dc49555563646b427e9e4df60733..195669654ed48709fd39791c93c37f3238e7db0f 100644
--- a/src/sql/engine/subquery/ob_subplan_filter.h
+++ b/src/sql/engine/subquery/ob_subplan_filter.h
@@ -104,6 +104,7 @@ private:
   virtual int64_t to_string_kv(char* buf, const int64_t buf_len) const;
   int handle_update_set(ObSubPlanFilterCtx* subplan_ctx, const common::ObNewRow*& row) const;
   int construct_array_params(ObExecContext& ctx) const;
+  int reset_rescan_params(ObExecContext &ctx) const;
 
 private:
   DISALLOW_COPY_AND_ASSIGN(ObSubPlanFilter);
diff --git a/src/sql/engine/subquery/ob_subplan_filter_op.cpp b/src/sql/engine/subquery/ob_subplan_filter_op.cpp
index 98845854d35139b468474b6ca01b58b7ba5b268a..d28a2e1d8a069c96381bf671a62eab4c64c3dd02 100644
--- a/src/sql/engine/subquery/ob_subplan_filter_op.cpp
+++ b/src/sql/engine/subquery/ob_subplan_filter_op.cpp
@@ -325,6 +325,13 @@ int ObSubPlanFilterOp::inner_get_next_row()
       OZ(handle_update_set());
     }
   }
+  if (OB_ITER_END == ret) {
+    if (OB_FAIL(set_param_null())) {
+      LOG_WARN("failed to set param null", K(ret));
+    } else {
+      ret = OB_ITER_END;
+    }
+  }
   return ret;
 }
 
diff --git a/src/sql/plan_cache/ob_plan_cache_util.h b/src/sql/plan_cache/ob_plan_cache_util.h
index 8e5e54efbc17fed907359b73584b4976f5edc186..6bf76dcb317a90f7ba758b76820756be705d7af9 100644
--- a/src/sql/plan_cache/ob_plan_cache_util.h
+++ b/src/sql/plan_cache/ob_plan_cache_util.h
@@ -470,7 +470,7 @@ struct ObPlanCacheCtx {
         must_be_positive_index_(),
         multi_stmt_fp_results_(allocator),
         handle_id_(MAX_HANDLE),
-      is_remote_executor_(false)
+        is_remote_executor_(false)
   {
     bl_key_.tenant_id_ = tenant_id;
     fp_result_.pc_key_.is_ps_mode_ = is_ps_mode_;
diff --git a/src/sql/plan_cache/ob_prepare_stmt_struct.cpp b/src/sql/plan_cache/ob_prepare_stmt_struct.cpp
index 828dac6081d8f941c14d2f0252a1d7810d1545b1..6ce347d7030fa5bb5a621b113b89c884d03c870c 100644
--- a/src/sql/plan_cache/ob_prepare_stmt_struct.cpp
+++ b/src/sql/plan_cache/ob_prepare_stmt_struct.cpp
@@ -264,6 +264,7 @@ ObPsStmtInfo::ObPsStmtInfo(ObIAllocator* inner_allocator)
       dep_objs_(NULL),
       dep_objs_cnt_(0),
       ps_item_(NULL),
+      is_expired_evicted_(false), 
       allocator_(inner_allocator),
       external_allocator_(NULL)
 
@@ -286,6 +287,7 @@ ObPsStmtInfo::ObPsStmtInfo(ObIAllocator* inner_allocator, ObIAllocator* external
       ps_item_(NULL),
       tenant_version_(OB_INVALID_VERSION),
       is_expired_(false),
+      is_expired_evicted_(false), 
       allocator_(inner_allocator),
       external_allocator_(external_allocator)
 {}
@@ -312,6 +314,7 @@ int ObPsStmtInfo::deep_copy(const ObPsStmtInfo& other)
     ps_item_ = other.ps_item_;
     tenant_version_ = other.tenant_version_;
     is_expired_ = other.is_expired_;
+    is_expired_evicted_ = other.is_expired_evicted_;
     if (other.get_dep_objs_cnt() > 0) {
       dep_objs_cnt_ = other.get_dep_objs_cnt();
       if (NULL == (dep_objs_ = reinterpret_cast<ObSchemaObjVersion*>(
diff --git a/src/sql/plan_cache/ob_prepare_stmt_struct.h b/src/sql/plan_cache/ob_prepare_stmt_struct.h
index 89af0417cb13efde17f572716196378db93b50aa..2d2386d7aaec2a8def1393c148d880e79eeb5ff9 100644
--- a/src/sql/plan_cache/ob_prepare_stmt_struct.h
+++ b/src/sql/plan_cache/ob_prepare_stmt_struct.h
@@ -321,14 +321,9 @@ public:
   {
     tenant_version_ = tenant_version;
   }
-  void set_is_expired()
-  {
-    ATOMIC_STORE(&is_expired_, true);
-  }
-  int64_t is_expired()
-  {
-    return ATOMIC_LOAD(&is_expired_);
-  }
+  void set_is_expired() { ATOMIC_STORE(&is_expired_, true); }
+  bool is_expired() { return ATOMIC_LOAD(&is_expired_); }
+  bool *get_is_expired_evicted_ptr() { return &is_expired_evicted_; }
 
   DECLARE_VIRTUAL_TO_STRING;
 
@@ -351,6 +346,8 @@ private:
   ObPsStmtItem* ps_item_;
   int64_t tenant_version_;
   bool is_expired_;
+  // check whether has dec ref count for ps info expired
+  bool is_expired_evicted_;
 
   // ObDataBuffer is used to use the internal memory of ObPsStmtItem,
   // The memory essentially comes from inner_allocator_ in ObPsPlancache
diff --git a/src/sql/plan_cache/ob_ps_cache.cpp b/src/sql/plan_cache/ob_ps_cache.cpp
index 26f447689a28814cf3ddf986869a513a6ea614df..36d04ce7a4ebd62113196edc26d8d9ff67bc3b96 100644
--- a/src/sql/plan_cache/ob_ps_cache.cpp
+++ b/src/sql/plan_cache/ob_ps_cache.cpp
@@ -46,19 +46,10 @@ ObPsCache::ObPsCache()
 ObPsCache::~ObPsCache()
 {
   int ret = OB_SUCCESS;
-  ObSEArray<ObPsStmtId, 512> all_stmt_id;
-  ObGetAllStmtIdOp op(&all_stmt_id);
-  if (OB_FAIL(stmt_info_map_.foreach_refactored(op))) {
-    LOG_WARN("traverse stmt_info_map_ failed", K(ret));
-  } else if (OB_FAIL(op.get_callback_ret())) {
-    LOG_WARN("traverse stmt_info_map_ failed", K(ret));
-  } else {
-    for (int64_t i = 0; i < all_stmt_id.count(); ++i) {  // ignore ret
-      if (OB_FAIL(deref_ps_stmt(all_stmt_id.at(i), true /*erase_info*/))) {
-        LOG_WARN("deref_ps_stmt faield when destroy ObPsCache", K(ret), K(all_stmt_id.at(i)), K(all_stmt_id.count()));
-      }
-    }
-  }
+  // ps_stmt_id和ps_stmt_info创建时，会给其增加引用计数
+  // 现在PsCache要析构了，对所有内部对象减去1,如果引用计数到0，会显式free内存
+  cache_evict_all_ps();
+
   if (NULL != mem_context_) {
     DESTROY_CONTEXT(mem_context_);
     mem_context_ = NULL;
diff --git a/src/sql/plan_cache/ob_ps_cache_callback.h b/src/sql/plan_cache/ob_ps_cache_callback.h
index b46103861961f52690bcc1e10a3f7b65c038b986..39a49e6de70b78b877734e3003c3185b8c67e561 100644
--- a/src/sql/plan_cache/ob_ps_cache_callback.h
+++ b/src/sql/plan_cache/ob_ps_cache_callback.h
@@ -43,8 +43,14 @@ public:
       id_time.first = entry.first;
       id_time.second = entry.second->get_last_closed_timestamp();
       if (entry.second->is_expired()) {
-        if (OB_SUCCESS != (callback_ret_ = expired_ps_->push_back(id_time))) {
-          SQL_PC_LOG(WARN, "fail to push back key", K_(callback_ret));
+        // for expired ps info, only evicted once;
+        // use cas, because auto cache evict and flush ps cache may concurrent
+        // processing
+        if (ATOMIC_BCAS(entry.second->get_is_expired_evicted_ptr(), false,
+                        true)) {
+          if (OB_SUCCESS != (callback_ret_ = expired_ps_->push_back(id_time))) {
+            SQL_PC_LOG(WARN, "fail to push back key", K_(callback_ret));
+          }
         }
       } else {
         if (OB_SUCCESS != (callback_ret_ = closed_ps_->push_back(id_time))) {
diff --git a/src/sql/resolver/dml/ob_column_namespace_checker.cpp b/src/sql/resolver/dml/ob_column_namespace_checker.cpp
index c60ed75a954e19551ccf3d0bda69658613c05d02..7360534fc2152d99f44a5f21ead05079d0f4ae37 100644
--- a/src/sql/resolver/dml/ob_column_namespace_checker.cpp
+++ b/src/sql/resolver/dml/ob_column_namespace_checker.cpp
@@ -295,6 +295,7 @@ int ObColumnNamespaceChecker::find_column_in_single_table(
   // if databasename or table name is not specified,
   // we must check the uniqueness of column in the table with the same name
   bool is_match = true;
+  LOG_TRACE("column info", K(q_name), K(table_item));
   if (!q_name.database_name_.empty()) {
     if (OB_FAIL(ObResolverUtils::name_case_cmp(
             params_.session_info_, q_name.database_name_, table_item.database_name_, OB_TABLE_NAME_CLASS, is_match))) {
@@ -314,11 +315,6 @@ int ObColumnNamespaceChecker::find_column_in_single_table(
             params_.session_info_, q_name.tbl_name_, table_item.get_object_name(), OB_TABLE_NAME_CLASS, is_match))) {
       LOG_WARN("database name case compare failed", K(ret));
     }
-    if (OB_SUCC(ret) && !is_match && !table_item.synonym_name_.empty() &&
-        OB_FAIL(ObResolverUtils::name_case_cmp(
-            params_.session_info_, q_name.tbl_name_, table_item.synonym_name_, OB_TABLE_NAME_CLASS, is_match))) {
-      LOG_WARN("database name case compare failed", K(ret));
-    }
   }
   if (OB_SUCC(ret) && is_match) {
     if (OB_FAIL(check_column_exists(table_item, q_name.col_name_, is_match))) {
diff --git a/src/sql/resolver/dml/ob_dml_resolver.cpp b/src/sql/resolver/dml/ob_dml_resolver.cpp
index 7aa540c2e60f1898156135a762f04e222b828cdb..2765afcc34d9e5f966e92e90c9e29ac8849aab93 100644
--- a/src/sql/resolver/dml/ob_dml_resolver.cpp
+++ b/src/sql/resolver/dml/ob_dml_resolver.cpp
@@ -567,6 +567,7 @@ int ObDMLResolver::resolve_basic_column_item(const TableItem& table_item, const
       col_expr->set_synonym_db_name(table_item.synonym_db_name_);
       col_expr->set_synonym_name(table_item.synonym_name_);
       col_expr->set_column_attr(table_item.get_table_name(), col_schema->get_column_name_str());
+      col_expr->set_from_alias_table(!table_item.alias_name_.empty());
       col_expr->set_database_name(table_item.database_name_);
       // column maybe from alias table, so must reset ref id by table id from table_item
       col_expr->set_ref_id(table_item.table_id_, col_schema->get_column_id());
diff --git a/src/sql/resolver/expr/ob_raw_expr.h b/src/sql/resolver/expr/ob_raw_expr.h
index 7f0495e7e6f94b238aacc59229eddec9eaea8dde..637e2a7c64d9b0357a542dc2016e0479e6b526d2 100644
--- a/src/sql/resolver/expr/ob_raw_expr.h
+++ b/src/sql/resolver/expr/ob_raw_expr.h
@@ -1989,6 +1989,7 @@ public:
         is_lob_column_(false),
         is_unpivot_mocked_column_(false),
         is_hidden_(false),
+        from_alias_table_(false),
         real_expr_(nullptr)
   {
     set_expr_class(ObExpr::EXPR_COLUMN_REF);
@@ -2010,6 +2011,7 @@ public:
         is_lob_column_(false),
         is_unpivot_mocked_column_(false),
         is_hidden_(false),
+        from_alias_table_(false),
         real_expr_(nullptr)
   {
     set_expr_class(ObExpr::EXPR_COLUMN_REF);
@@ -2031,6 +2033,7 @@ public:
         is_lob_column_(false),
         is_unpivot_mocked_column_(false),
         is_hidden_(false),
+        from_alias_table_(false),
         real_expr_(nullptr)
   {
     set_expr_class(ObExpr::EXPR_COLUMN_REF);
@@ -2119,6 +2122,9 @@ public:
   virtual int do_visit(ObRawExprVisitor& visitor) override;
 
   virtual uint64_t hash_internal(uint64_t seed) const;
+
+  bool is_from_alias_table() const { return from_alias_table_; }
+  void set_from_alias_table(bool value) { from_alias_table_ = value; }
   inline bool is_generated_column() const
   {
     return share::schema::ObSchemaUtils::is_generated_column(column_flags_);
@@ -2226,6 +2232,7 @@ private:
   bool is_lob_column_;             // TODO add lob column
   bool is_unpivot_mocked_column_;  // used for unpivot
   bool is_hidden_;                 // used for print hidden column
+  bool from_alias_table_;
   ObRawExpr* real_expr_;           // for oracle virtual table that is mapping a real table
 };
 
diff --git a/src/sql/resolver/expr/ob_raw_expr_printer.cpp b/src/sql/resolver/expr/ob_raw_expr_printer.cpp
index 2daf06483a53d327b7f8aa37a71b6fb6980a53f9..9336ecfbe0e37c00ea6963f383c095a514860ae7 100644
--- a/src/sql/resolver/expr/ob_raw_expr_printer.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_printer.cpp
@@ -280,6 +280,9 @@ int ObRawExprPrinter::print(ObColumnRefRawExpr* expr)
           is_oracle_mode ? "\"%.*s\".\"%.*s\"" : "`%.*s`.`%.*s`", LEN_AND_PTR(table_name), LEN_AND_PTR(col_name));
     } else if (OB_UNLIKELY(only_column_namespace_)) {
       DATA_PRINTF(is_oracle_mode ? "\"%.*s\"" : "`%.*s`", LEN_AND_PTR(col_name));
+    } else if (expr->is_from_alias_table()) {
+      DATA_PRINTF(is_oracle_mode ? "\"%.*s\".\"%.*s\"" : "`%.*s`.`%.*s`",
+                  LEN_AND_PTR(expr->get_table_name()), LEN_AND_PTR(col_name));
     } else {
       if (!expr->get_synonym_name().empty() && !expr->get_synonym_db_name().empty()) {
         ObString synonyn_db_name = expr->get_synonym_db_name();
diff --git a/src/sql/session/ob_basic_session_info.h b/src/sql/session/ob_basic_session_info.h
index ae02637eaa0ea1a949ad870338986ecc4143a8bf..d2d655c0ae74b7a24d7da5f0858fc4fdf3c77dfd 100644
--- a/src/sql/session/ob_basic_session_info.h
+++ b/src/sql/session/ob_basic_session_info.h
@@ -1259,48 +1259,31 @@ public:
   int get_max_allowed_packet(int64_t& max_allowed_pkt) const;
   int get_net_buffer_length(int64_t& net_buffer_len) const;
   /// @}
-  int64_t get_session_info_mem_size() const
-  {
-    return block_allocator_.get_total_mem_size();
-  }
-  int64_t get_sys_var_mem_size() const
-  {
-    return base_sys_var_alloc_.total();
-  }
-  // for improving cache miss of proxy, nothing to do with the set_partition_hit() above.
-  ObPartitionHitInfo& partition_hit()
-  {
-    return partition_hit_;
-  }
-  void set_shadow(bool is_shadow)
-  {
-    ATOMIC_STORE(&thread_data_.is_shadow_, is_shadow);
-  }
-  bool is_shadow()
-  {
-    return ATOMIC_LOAD(&thread_data_.is_shadow_);
-  }
-  uint32_t get_version() const
-  {
-    return version_;
-  }
-  uint32_t get_magic_num()
-  {
-    return magic_num_;
-  }
-  int64_t get_current_execution_id() const
-  {
-    return current_execution_id_;
-  }
-  const common::ObCurTraceId::TraceId& get_last_trace_id() const
-  {
-    return last_trace_id_;
-  }
-  void set_current_execution_id(int64_t execution_id)
-  {
-    current_execution_id_ = execution_id;
-  }
-  void set_last_trace_id(common::ObCurTraceId::TraceId* trace_id)
+  int64_t get_session_info_mem_size() const { return block_allocator_.get_total_mem_size(); }
+  int64_t get_sys_var_mem_size() const { return base_sys_var_alloc_.total(); }
+  ObPartitionHitInfo &partition_hit() { return partition_hit_; } // 和上面的set_partition_hit没有任何关系
+  bool get_err_final_partition_hit(int err_ret)
+  {
+    bool is_partition_hit = partition_hit().get_bool();
+    if (is_proxy_refresh_location_ret(err_ret)) {
+      is_partition_hit = false;
+    } else if (get_is_in_retry()
+               && is_proxy_refresh_location_ret(retry_info_.get_last_query_retry_err())) {
+      is_partition_hit = false;
+    }
+    return is_partition_hit;
+  };
+  bool is_proxy_refresh_location_ret(int err_ret) {
+    return common::OB_NOT_MASTER == err_ret;
+  }
+  void set_shadow(bool is_shadow) { ATOMIC_STORE(&thread_data_.is_shadow_, is_shadow); }
+  bool is_shadow() { return ATOMIC_LOAD(&thread_data_.is_shadow_);  }
+  uint32_t get_version() const {return version_;}
+  uint32_t get_magic_num() {return magic_num_;}
+  int64_t get_current_execution_id() const { return current_execution_id_; }
+  const common::ObCurTraceId::TraceId &get_last_trace_id() const { return last_trace_id_; }
+  void set_current_execution_id(int64_t execution_id) { current_execution_id_ = execution_id; }
+  void set_last_trace_id(common::ObCurTraceId::TraceId *trace_id)
   {
     if (OB_ISNULL(trace_id)) {
     } else {
diff --git a/src/sql/session/ob_sql_session_info.cpp b/src/sql/session/ob_sql_session_info.cpp
index f5c1f286a9b12f24b4acb43eb4f9b371eec7c4a3..1cb3093f534e84652811077830fc7e3b6dcde5f6 100644
--- a/src/sql/session/ob_sql_session_info.cpp
+++ b/src/sql/session/ob_sql_session_info.cpp
@@ -803,7 +803,9 @@ int ObSQLSessionInfo::get_ps_session_info(const ObPsStmtId stmt_id, ObPsSessionI
 int ObSQLSessionInfo::remove_ps_session_info(const ObPsStmtId stmt_id)
 {
   int ret = OB_SUCCESS;
-  ObPsSessionInfo* session_info = NULL;
+  ObPsSessionInfo *session_info = NULL;
+  LOG_TRACE("remove ps session info", K(ret), K(stmt_id), K(get_sessid()),
+            K(lbt()));
   if (OB_FAIL(ps_session_info_map_.erase_refactored(stmt_id, &session_info))) {
     LOG_WARN("ps session info not exist", K(stmt_id));
   } else if (OB_ISNULL(session_info)) {
diff --git a/unittest/sql/rewrite/result/test_transformer_stmt_after_together.result b/unittest/sql/rewrite/result/test_transformer_stmt_after_together.result
index e0ac0027128e4f6747ca104c909aa7fcf93c2397..033ef669077d6c01327ccff6bccb3a619c1980ff 100644
--- a/unittest/sql/rewrite/result/test_transformer_stmt_after_together.result
+++ b/unittest/sql/rewrite/result/test_transformer_stmt_after_together.result
@@ -65110,8 +65110,8 @@ SQL: select * from vv1;
             ]
           },
           "is_alias":false,
-          "alias_name":"(`opt`.`t1`.`c1` + 2)",
-          "expr_name":"(`opt`.`t1`.`c1` + 2)",
+          "alias_name":"(`t1`.`c1` + 2)",
+          "expr_name":"(`t1`.`c1` + 2)",
           "default": {
             "NULL":"NULL"
           },
@@ -65355,7 +65355,7 @@ SQL: select * from vv1;
           },
           "is_alias":false,
           "alias_name":"c1",
-          "expr_name":"`opt`.`t1`.`c1`",
+          "expr_name":"`t1`.`c1`",
           "default": {
             "NULL":"NULL"
           },