Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/21169 I think we should fix the doc here too: https://github.com/apache/spark/blob/cd10f9df8284ee8a5d287b2cd204c70b8ba87f5e/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L2871-L2872
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