[GitHub] [doris] yixiutt commented on a diff in pull request #15749: [improvement](reader) use union merge when rowset are noneoverlapping

[GitBox <gi...@apache.org>]

yixiutt commented on code in PR #15749:
URL: https://github.com/apache/doris/pull/15749#discussion_r1068116639


##########
be/src/vec/olap/vcollect_iterator.cpp:
##########
@@ -129,6 +132,19 @@ Status VCollectIterator::build_heap(std::vector<RowsetReaderSharedPtr>& rs_reade
                     new Level1Iterator(_children, _reader, _merge, _is_reverse, _skip_same));
         }
     } else {
+        bool have_multiple_child = false;
+        bool is_first_child = true;
+        for (auto iter = _children.begin(); iter != _children.end();) {
+            auto s = (*iter)->init_for_union(is_first_child, have_multiple_child);
+            if (!s.ok()) {
+                delete (*iter);
+                iter = _children.erase(iter);
+            } else {

Review Comment:
   fixed



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