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doris/be/src/runtime
zhoubintao 85521944dd [refactor](olap-scan-node) Refactor olap scannode (#7131)
1. Delete useless variables
2. Add const modifier for read-only function
3. Delete the empty destructor, the compiler will automatically generate it, refer to the 3/5/0 rule: 
    [https://en.cppreference.com/w/cpp/language/rule_of_three]
4. It is recommended to add the override keyword (instead of the virtual keyword) to the subclass virtual function. 
    Override will let the compiler help check and improve security. This is also the reason why C++11 introduces override
2021-12-16 10:33:41 +08:00
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