zhannngchen commented on code in PR #17147:
URL: https://github.com/apache/doris/pull/17147#discussion_r1118238160


##########
be/src/olap/rowset/beta_rowset_writer.cpp:
##########
@@ -759,15 +759,21 @@ void 
BetaRowsetWriter::_build_rowset_meta(std::shared_ptr<RowsetMeta> rowset_met
     int64_t total_data_size = 0;
     int64_t total_index_size = 0;
     std::vector<KeyBoundsPB> segments_encoded_key_bounds;
+    std::unordered_set<std::string> key_set;
     {
         std::lock_guard<std::mutex> lock(_segid_statistics_map_mutex);
         for (const auto& itr : _segid_statistics_map) {
             num_rows_written += itr.second.row_num;
             total_data_size += itr.second.data_size;
             total_index_size += itr.second.index_size;
             segments_encoded_key_bounds.push_back(itr.second.key_bounds);
+            if (_context.enable_unique_key_merge_on_write) {
+                DCHECK(itr.second.key_set.get() != nullptr);
+                key_set.insert(itr.second.key_set->begin(), 
itr.second.key_set->end());

Review Comment:
   values in `unordered_set` is const type, we can't use `std::move` to avoid 
data copy here, use `insert` directly.



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