imay commented on a change in pull request #2933: Use `std::bind` to replace 
`boost::bind` in flush-executor
URL: https://github.com/apache/incubator-doris/pull/2933#discussion_r380666858
 
 

 ##########
 File path: be/src/olap/memtable_flush_executor.cpp
 ##########
 @@ -35,15 +31,15 @@ std::ostream& operator<<(std::ostream& os, const 
FlushStatistic& stat) {
 }
 
 OLAPStatus FlushToken::submit(std::shared_ptr<MemTable> memtable) {
 
 Review comment:
   why not use `const std::shared_ptr<MemTable>&` to avoid a copy assignment?

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