Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/240#discussion_r113042124
  
    --- Diff: query_optimizer/rules/ReuseAggregateExpressions.cpp ---
    @@ -194,7 +194,7 @@ P::PhysicalPtr ReuseAggregateExpressions::applyToNode(
                 sum_it == ref_map.end() ? kInvalidRef : sum_it->second.front();
     
             for (const std::size_t idx : avg_it->second) {
    -          agg_refs[idx].reset(new AggregateReference(sum_ref, count_ref));
    +          agg_refs[idx] = std::make_unique<AggregateReference>(sum_ref, 
count_ref);
    --- End diff --
    
    Memory leaks upon system failures when using `new`.


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