But in some cases, it may be necessary to add index information and statistics to the nickname after it is created in order to get the optimizer to push down predicates used with the nickname.

但是在某些情况下，在创建昵称之后，可能需要添加索引信息和统计信息，以便让优化器下推与昵称一起使用的谓词。

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At first, simple key word searching does not meet the needs of users any more. They may add some conditions to filter the information to get the right answers.

首先，用户不再满足于简单关键词的查找，他们会通过添加一系列条件过滤掉不相关信息来得到所需知识。

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