When a query references a function template, the query optimizer tries to generate a feasible plan that allows this function reference to be evaluated on the remote data source.

当一个查询引用一个函数模板时，查询优化器尝试生成一个灵活的计划，允许在远程数据源上计算这个函数引用。

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Note that this function takes a hash reference, not an actual file name.

注意，该函数接受散列引用，而不是实际的文件名。

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This feature is richer than function Pointers because it allows the inner class instance to retain a reference to the environment in which it was created.

该特性比函数指针更强大，因为它允许内部类实例保持对创建它的环境的引用。

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