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Clojure 语法问题

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Clojure 语法问题

Clojure 新人。
看Metabase源码的时候看到的下面的代码。
image.png
想问 ((set k-or-ks) (first x)) 这行是怎么计算的？ 最终((set k-or-ks) (first x)) 返回的是什么是boolean 还是数据集合？


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