Goal directives that force the optimizer to use the designated rules to return query results.

目标指示，强制优化器使用指定的规则来返回查询结果。

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By analyzing the Visual Explain output in Figure 6, from the second query, it is possible to confirm that the optimizer ran with the expected optimization goal of FIRSTIO.

通过分析图6中对于第二个查询的Visual Explain输出，可以证实优化器将达到FIRSTIO的预期优化目标。

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