HappenLee commented on code in PR #12316:
URL: https://github.com/apache/doris/pull/12316#discussion_r964528447


##########
be/src/vec/olap/vgeneric_iterators.cpp:
##########
@@ -239,7 +254,7 @@ class VMergeIteratorContext {
     void reset_cur_batch() { _cur_batch_num = 0; }
 
     bool is_cur_block_finished() {
-        if (_index_in_block == _block.rows() - 1) {
+        if (_index_in_block == _block->rows() - 1) {

Review Comment:
   return `_index_in_block == _block->rows() - 1`



##########
be/src/vec/olap/vgeneric_iterators.cpp:
##########
@@ -298,8 +314,23 @@ Status VMergeIteratorContext::advance() {
 
 Status VMergeIteratorContext::_load_next_block() {
     do {
-        block_reset();
-        Status st = _iter->next_batch(&_block);
+        if (_block != nullptr) {
+            _block_list.push_back(_block);
+            _block = nullptr;
+        }
+        for (auto it = _block_list.begin(); it != _block_list.end(); it++) {
+            if (it->use_count() <= 1) {

Review Comment:
   only == 1, do not lower



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