You must build an index for every multiline text field in the user database where a text query is used as a filter.
您必须在用户数据库中为每一个多行文本域建立一个索引,在这个数据库中文本查询相当域一个筛选程序。
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For example, if a user were to type in a string that is used to search some index, it may be important to filter the string for improper wildcard characters that might cause unbounded searches.