diff --git a/src/storage/access/ob_index_tree_prefetcher.cpp b/src/storage/access/ob_index_tree_prefetcher.cpp
index a1deb0d54..346cc3173 100755
--- a/src/storage/access/ob_index_tree_prefetcher.cpp
+++ b/src/storage/access/ob_index_tree_prefetcher.cpp
@@ -1204,7 +1204,7 @@ public:
     } else if (OB_UNLIKELY(!index_info.is_valid() || !rowkey.is_valid())) {
       ret = OB_INVALID_ARGUMENT;
       LOG_WARN("Invalid MicroIndexInfo", K(ret), K(index_info), K(rowkey));
-    } else if (OB_FAIL(index_info.endkey_->compare(rowkey, datum_utils_, cmp_ret))) {
+    } else if (OB_FAIL(index_info.endkey_->compare(rowkey, datum_utils_, cmp_ret, false))) {
       LOG_WARN("fail to compare rowkey", K(ret), KPC(index_info.endkey_), K(rowkey));
     }
     return cmp_ret;
@@ -1268,7 +1268,7 @@ int ObIndexTreeMultiPassPrefetcher<DATA_PREFETCH_DEPTH, INDEX_PREFETCH_DEPTH>::c
     int64_t start_idx = start_pos % max_micro_handle_cnt_;
     int64_t end_idx = end_pos % max_micro_handle_cnt_;
     if (!is_reverse) {
-      if (OB_FAIL(micro_data_infos_[end_idx].endkey_->compare(border_rowkey, datum_utils, cmp_ret))) {
+      if (OB_FAIL(micro_data_infos_[end_idx].endkey_->compare(border_rowkey, datum_utils, cmp_ret, false))) {
         LOG_WARN("Fail to compare endkey", K(ret), K(border_rowkey), K(micro_data_infos_[start_idx].endkey_));
       } else if (cmp_ret < 0) {
         for (int64_t pos = start_pos; pos < end_pos; pos++) {
@@ -1286,7 +1286,7 @@ int ObIndexTreeMultiPassPrefetcher<DATA_PREFETCH_DEPTH, INDEX_PREFETCH_DEPTH>::c
           } else {
             cmp_ret = 0;
             // split to [start_idx, max_micro_handle_cnt_ - 1], [0, end_idx - 1]
-            if (OB_FAIL(micro_data_infos_[max_micro_handle_cnt_ - 1].endkey_->compare(border_rowkey, datum_utils, cmp_ret))) {
+            if (OB_FAIL(micro_data_infos_[max_micro_handle_cnt_ - 1].endkey_->compare(border_rowkey, datum_utils, cmp_ret, false))) {
               LOG_WARN("Fail to compare endkey", K(ret), K(border_rowkey), K(micro_data_infos_[max_micro_handle_cnt_ - 1]));
             } else if (cmp_ret < 0) {
               for (int64_t idx = start_idx; idx < max_micro_handle_cnt_; idx++) {
@@ -1315,7 +1315,7 @@ int ObIndexTreeMultiPassPrefetcher<DATA_PREFETCH_DEPTH, INDEX_PREFETCH_DEPTH>::c
         } else {
           cmp_ret = 0;
           // split to [start_idx, max_micro_handle_cnt_ - 1], [0, end_idx]
-          if (OB_FAIL(micro_data_infos_[0].endkey_->compare(border_rowkey, datum_utils, cmp_ret))) {
+          if (OB_FAIL(micro_data_infos_[0].endkey_->compare(border_rowkey, datum_utils, cmp_ret, false))) {
             LOG_WARN("Fail to compare endkey", K(ret), K(border_rowkey), K(micro_data_infos_[0]));
           } else if (cmp_ret > 0) {
             for (int64_t idx = start_idx; idx < max_micro_handle_cnt_; idx++) {
diff --git a/src/storage/blocksstable/ob_datum_rowkey.cpp b/src/storage/blocksstable/ob_datum_rowkey.cpp
index 368d72652..7a0c8ba76 100644
--- a/src/storage/blocksstable/ob_datum_rowkey.cpp
+++ b/src/storage/blocksstable/ob_datum_rowkey.cpp
@@ -94,7 +94,8 @@ int ObDatumRowkey::equal(const ObDatumRowkey &rhs, const ObStorageDatumUtils &da
   return ret;
 }
 
-int ObDatumRowkey::compare(const ObDatumRowkey &rhs, const ObStorageDatumUtils &datum_utils, int &cmp_ret) const
+int ObDatumRowkey::compare(const ObDatumRowkey &rhs, const ObStorageDatumUtils &datum_utils, int &cmp_ret,
+                           const bool compare_datum_cnt) const
 {
   int ret = OB_SUCCESS;
 
@@ -114,7 +115,7 @@ int ObDatumRowkey::compare(const ObDatumRowkey &rhs, const ObStorageDatumUtils &
           STORAGE_LOG(WARN, "Failed to compare datum rowkey", K(ret), K(i), K(*this), K(rhs));
         }
       }
-      if (0 == cmp_ret) {
+      if (0 == cmp_ret && compare_datum_cnt) {
         cmp_ret = datum_cnt_ - rhs.datum_cnt_;
       }
     }
diff --git a/src/storage/blocksstable/ob_datum_rowkey.h b/src/storage/blocksstable/ob_datum_rowkey.h
index 650180b0b..012e5e827 100644
--- a/src/storage/blocksstable/ob_datum_rowkey.h
+++ b/src/storage/blocksstable/ob_datum_rowkey.h
@@ -73,7 +73,8 @@ public:
   #undef DEF_ROWKEY_TYPE_FUNCS
 
   int equal(const ObDatumRowkey &rhs, const ObStorageDatumUtils &datum_utils, bool &is_equal) const;
-  int compare(const ObDatumRowkey &rhs, const ObStorageDatumUtils &datum_utils, int &cmp_ret) const;
+  int compare(const ObDatumRowkey &rhs, const ObStorageDatumUtils &datum_utils, int &cmp_ret,
+              const bool compare_datum_cnt = true) const;
   int from_rowkey(const ObRowkey &rowkey, common::ObIAllocator &allocator);
   int from_rowkey(const ObRowkey &rowkey, ObStorageDatumBuffer &datum_buffer);
   int to_store_rowkey(const common::ObIArray<share::schema::ObColDesc> &col_descs,
diff --git a/src/storage/blocksstable/ob_index_block_row_scanner.cpp b/src/storage/blocksstable/ob_index_block_row_scanner.cpp
index e20115c35..4326abaae 100644
--- a/src/storage/blocksstable/ob_index_block_row_scanner.cpp
+++ b/src/storage/blocksstable/ob_index_block_row_scanner.cpp
@@ -414,10 +414,10 @@ int ObIndexBlockRowScanner::check_blockscan(
         LOG_WARN("Fail to get last row of micro block", K(ret), K_(end));
       } else if (OB_FAIL(last_endkey.assign(tmp_datum_row.storage_datums_, datum_utils_->get_rowkey_count()))) {
         LOG_WARN("Fail to assign storage datum to endkey", K(ret), K(tmp_datum_row));
-      } else if (OB_FAIL(last_endkey.compare(rowkey, *datum_utils_, cmp_ret))) {
+      } else if (OB_FAIL(last_endkey.compare(rowkey, *datum_utils_, cmp_ret, false))) {
         LOG_WARN("Fail to compare rowkey", K(ret), K(last_endkey), K(rowkey));
       }
-    } else if (OB_FAIL((idx_data_header_->rowkey_array_ + end_)->compare(rowkey, *datum_utils_, cmp_ret))) {
+    } else if (OB_FAIL((idx_data_header_->rowkey_array_ + end_)->compare(rowkey, *datum_utils_, cmp_ret, false))) {
       LOG_WARN("Fail to compare rowkey", K(ret), K(rowkey));
     }