Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5248#discussion_r27429547
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullFunctions.scala
---
@@ -74,3 +74,26 @@ case class IsNotNull(child: Expression) extends
Predicate with trees.UnaryNode[E
child.eval(input) != null
}
}
+
+/**
+ * A predicate that is evaluated to be true if there are at least `n` null
values in the children.
--- End diff --
`null` -> `non-null`.
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