Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21482#discussion_r192547355
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -557,6 +557,14 @@ class Column(val expr: Expression) extends Logging {
(this >= lowerBound) && (this <= upperBound)
}
+ /**
+ * True if the current expression is NaN.
--- End diff --
? is this the same with `isNaN`?
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