目录业务场景：功能实现：DDL 脚本语法：1、新增字段create_time语法2、修改字段create_time语法3、新增字段update_time 语法4、修改字段update_time 语法总结业务场景：
I have a loop here and I want to make it run faster. I am passing in a large array. I recently heard of Duff\'s Device ca开发者_运维百科n it be applied to this for loop? any ideas?
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