diff --git a/src/storage/access/ob_table_access_param.h b/src/storage/access/ob_table_access_param.h
index e39564f96..3ddaa13c6 100644
--- a/src/storage/access/ob_table_access_param.h
+++ b/src/storage/access/ob_table_access_param.h
@@ -96,11 +96,18 @@ public:
   {
     return (read_info_ != nullptr && read_info_ != rowkey_read_info_) ? read_info_->get_group_idx_col_index() : common::OB_INVALID_INDEX;
   }
-  bool can_be_reused(const uint32_t cg_idx, const sql::ObExpr *expr) const
+  bool can_be_reused(const uint32_t cg_idx, const common::ObIArray<sql::ObExpr*> &exprs, const bool is_aggregate)
   {
-    // there is only one column in cg now
-    bool can_reuse = cg_idx == cg_idx_ && nullptr != output_exprs_
-                  && 1 == output_exprs_->count() && output_exprs_->at(0) == expr;
+    bool can_reuse = cg_idx == cg_idx && enable_pd_aggregate() == is_aggregate
+                      && nullptr != output_exprs_ && output_exprs_->count() == exprs.count() ;
+    if (can_reuse) {
+      for (int64_t i = 0; i < exprs.count(); ++i) {
+        if (output_exprs_->at(i) != exprs.at(i)) {
+          can_reuse = false;
+          break;
+        }
+      }
+    }
     return can_reuse;
   }
   OB_INLINE bool need_fill_group_idx() const
diff --git a/src/storage/column_store/ob_cg_iter_param_pool.cpp b/src/storage/column_store/ob_cg_iter_param_pool.cpp
index 03fac625a..47d5f64c9 100644
--- a/src/storage/column_store/ob_cg_iter_param_pool.cpp
+++ b/src/storage/column_store/ob_cg_iter_param_pool.cpp
@@ -37,6 +37,28 @@ int ObCGIterParamPool::get_iter_param(
     const int32_t cg_idx,
     const ObTableIterParam &row_param,
     sql::ObExpr *expr,
+    ObTableIterParam *&iter_param)
+{
+  int ret = OB_SUCCESS;
+  iter_param = nullptr;
+  if (OB_UNLIKELY(0 > cg_idx || !row_param.is_valid())) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("Invalid argument", K(ret), K(cg_idx), K(row_param));
+  } else {
+    common::ObSEArray<sql::ObExpr*, 1> exprs;
+    if (nullptr != expr && OB_FAIL(exprs.push_back(expr))) {
+      LOG_WARN("Fail to push back", K(ret));
+    } else if (OB_FAIL(get_iter_param(cg_idx, row_param, exprs, iter_param))) {
+      LOG_WARN("Fail to get cg iter param", K(ret));
+    }
+  }
+  return ret;
+}
+
+int ObCGIterParamPool::get_iter_param(
+    const int32_t cg_idx,
+    const ObTableIterParam &row_param,
+    const common::ObIArray<sql::ObExpr*> &exprs,
     ObTableIterParam *&iter_param,
     const bool is_aggregate)
 {
@@ -45,26 +67,21 @@ int ObCGIterParamPool::get_iter_param(
   if (OB_UNLIKELY(0 > cg_idx || !row_param.is_valid())) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("Invalid argument", K(ret), K(cg_idx), K(row_param));
-  } else if (!is_aggregate) {
+  } else {
     for (int64_t i = 0; OB_SUCC(ret) && i < iter_params_.count(); ++i) {
       ObTableIterParam* tmp_param = iter_params_.at(i);
       if (OB_ISNULL(tmp_param)) {
         ret = OB_ERR_UNEXPECTED;
         LOG_WARN("Unexpected null iter param", K(ret));
-      } else if (tmp_param->can_be_reused(cg_idx, expr)) {
+      } else if (tmp_param->can_be_reused(cg_idx, exprs, is_aggregate)) {
         iter_param = tmp_param;
         break;
       }
     }
   }
   if (OB_FAIL(ret) || OB_NOT_NULL(iter_param)) {
-  } else {
-    common::ObSEArray<sql::ObExpr*, 1> exprs;
-    if (OB_FAIL(exprs.push_back(expr))) {
-      LOG_WARN("Fail to push back", K(ret));
-    } else if (OB_FAIL(new_iter_param(cg_idx, row_param, exprs, iter_param, is_aggregate))) {
-      LOG_WARN("Fail to new cg iter param", K(ret));
-    }
+  } else if (OB_FAIL(new_iter_param(cg_idx, row_param, exprs, iter_param, is_aggregate))) {
+    LOG_WARN("Fail to new cg iter param", K(ret));
   }
   return ret;
 }
@@ -102,11 +119,11 @@ int ObCGIterParamPool::new_iter_param(
     }
   } else if (OB_FAIL(fill_cg_iter_param(row_param, cg_idx, exprs, *iter_param))) {
     STORAGE_LOG(WARN, "Failed to mock cg iter param", K(ret), K(row_param), K(cg_idx), K(exprs));
-  } else if (OB_FAIL(put_iter_param(iter_param))) {
-    LOG_WARN("Fail to put iter param", K(ret));
   }
   if (OB_SUCC(ret)) {
-    if (!is_aggregate) {
+    if (OB_FAIL(put_iter_param(iter_param))) {
+      LOG_WARN("Fail to put iter param", K(ret));
+    } else if (!is_aggregate) {
       iter_param->disable_pd_aggregate();
     }
   } else if (nullptr != iter_param) {
diff --git a/src/storage/column_store/ob_cg_iter_param_pool.h b/src/storage/column_store/ob_cg_iter_param_pool.h
index 2cbb48eab..cef8af90b 100644
--- a/src/storage/column_store/ob_cg_iter_param_pool.h
+++ b/src/storage/column_store/ob_cg_iter_param_pool.h
@@ -28,18 +28,23 @@ public:
   ~ObCGIterParamPool() { reset(); }
   void reset();
   int get_iter_param(
-      const int32_t cg_idx,
-      const ObTableIterParam &row_param,
-      sql::ObExpr *expr,
-      ObTableIterParam *&iter_param,
-      const bool is_aggregate = false);
+    const int32_t cg_idx,
+    const ObTableIterParam &row_param,
+    sql::ObExpr *expr,
+    ObTableIterParam *&iter_param);
+  int get_iter_param(
+    const int32_t cg_idx,
+    const ObTableIterParam &row_param,
+    const common::ObIArray<sql::ObExpr*> &exprs,
+    ObTableIterParam *&iter_param,
+    const bool is_aggregate = false);
+private:
   int new_iter_param(
       const int32_t cg_idx,
       const ObTableIterParam &row_param,
       const common::ObIArray<sql::ObExpr*> &exprs,
       ObTableIterParam *&iter_param,
       const bool is_aggregate = false);
-private:
   int fill_cg_iter_param(
       const ObTableIterParam &row_param,
       const int32_t cg_idx,
diff --git a/src/storage/column_store/ob_co_sstable_row_scanner.cpp b/src/storage/column_store/ob_co_sstable_row_scanner.cpp
index 63cfcff72..beeff305c 100644
--- a/src/storage/column_store/ob_co_sstable_row_scanner.cpp
+++ b/src/storage/column_store/ob_co_sstable_row_scanner.cpp
@@ -423,7 +423,7 @@ int ObCOSSTableRowScanner::construct_cg_iter_params(
     } else if (0 == row_param.output_exprs_->count()) {
       const uint32_t cg_idx = OB_CS_VIRTUAL_CG_IDX;
       if (project_single_row) {
-      } else if (OB_FAIL(cg_param_pool_->new_iter_param(cg_idx, row_param, *row_param.output_exprs_,
+      } else if (OB_FAIL(cg_param_pool_->get_iter_param(cg_idx, row_param, *row_param.output_exprs_,
                                                         cg_param, row_param.enable_pd_aggregate()))) {
         LOG_WARN("Fail to get cg iter param", K(ret), K(cg_idx), K(row_param));
       } else if (OB_FAIL(iter_params.push_back(cg_param))) {
@@ -475,7 +475,7 @@ int ObCOSSTableRowScanner::construct_cg_agg_iter_params(
   } else if (0 == row_param.output_exprs_->count()) {
     // only COUNT(*) and without filter
     const uint32_t cg_idx = OB_CS_VIRTUAL_CG_IDX;
-    if (OB_FAIL(cg_param_pool_->new_iter_param(cg_idx, row_param, *row_param.aggregate_exprs_,
+    if (OB_FAIL(cg_param_pool_->get_iter_param(cg_idx, row_param, *row_param.aggregate_exprs_,
         cg_param, row_param.enable_pd_aggregate()))) {
       LOG_WARN("Fail to get cg iter param", K(ret), K(cg_idx), K(row_param));
     } else if (OB_FAIL(iter_params.push_back(cg_param))) {
@@ -510,7 +510,7 @@ int ObCOSSTableRowScanner::construct_cg_agg_iter_params(
         }
       }
       if (OB_FAIL(ret) || 0 == exprs.count()) {
-      } else if (OB_FAIL(cg_param_pool_->new_iter_param(cg_idx, row_param, exprs, cg_param, row_param.enable_pd_aggregate()))) {
+      } else if (OB_FAIL(cg_param_pool_->get_iter_param(cg_idx, row_param, exprs, cg_param, row_param.enable_pd_aggregate()))) {
         LOG_WARN("Fail to get cg iter param", K(ret), K(cg_idx), K(row_param));
       } else if (OB_FAIL(iter_params.push_back(cg_param))) {
         LOG_WARN("Fail to push back cg iter param", K(ret), K(cg_param));