The author makes a further investigation on the cognitive causation of the syntactic structure of double predicate.
作者对双重谓语的特殊句式进一步分析其认知动因。
参考来源 - 双重谓语的认知研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The following query explicitly casts both sides of the join predicate to DOUBLE.
以下查询明确地将连接谓词的两端转换为DOUBLE。
As you see in Table 3, a string predicate can only be evaluated with an XML index of type VARCHAR, while a numeric predicate can only be evaluated with an index of type DOUBLE.
正如您在表3中所看到的，字符串谓词只能由varchar类型的xml索引进行计算，而数值谓词只能由double类型的索引进行计算。
If the XML index is defined as double, you cast the join predicate with xs: double.
如果将xml索引定义为double，则用xs： double转换连接谓词。
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