The filter factor is a number between 0 and 1 that estimates the proportion of rows in a table for which the predicate is true.

过滤因子是0到1之间的一个数值，它用来评估表中谓词为真的行所占的比例。

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The result of this predicate is true only if the program exits with the same exit_code mentioned in the predicate.

只有在程序退出且退出码与谓词中的exit _ code相同的情况下，这个谓词的结果才是true。

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If the predicate returns true, it adds it to the results array.

如果谓词返回true，则它将此值添加到结果数组中。

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