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4.7K gcsemaths (dot)online @MathsGCSETutor The cardinality of the continuum says no 1:34 PM · Oct 11, 2026 · 42 Views ...

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cardinality 本身不支持多字段，但可以通过 script 来实现。 不过脚本聚合的性能很差，每次都要执行脚本计算，不建议在大数据量场景使用。 更常见的需求是处理缺失值。 如果某个文档的 user_id 字段为空，默认情况下它不会被计入 cardinality 。