如何高效地处理说明性查询语言中嵌入的用户自定义函数，是查询优化的一个重要内容。

How to process user defined functions incorporated in declarative query languages efficiently is an important aspect of query optimization.

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这些查询用编程语言本身表示，而不表示为嵌入在应用程序代码中的字符串。

These queries are expressed in the programming language itself, rather than as string literals embedded in the application code.

youdao

这些查询用编程语言本身表示，而不表示为嵌入在应用程序代码中的字符串。

These queries are expressed in the programming language itself, rather than as string literals embedded in the application code.

youdao