调用方知道哪个结果对于特定的请求是正确的，因为它有正确的关联标识符。
The caller knows which result is the right one for its particular request because it has the right correlation identifier.
结果集是一个数组，该数组由0个或多个与数据库查询相匹配的行组成；结果集标识符只是一个值，您可以将该值传递给其它函数，以使它们能够使用结果集中的行。
A result set is an array consisting of 0 or more rows that match a database query; a result set identifier is simply a value that you pass to other functions to work with the rows in the result set.
从结果中不难看出，当标识符解析的过程需要进行深度搜索时，会伴随性能损失，而且性能损失的程度会随着标识符深度的增加而递增。
From the results, it's clear that there is a performance penalty associated with deep searches for identifier resolution. Each increase in identifier depth shows an increase in execution.
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