Github user frreiss commented on a diff in the pull request:
https://github.com/apache/spark/pull/10437#discussion_r55442828
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -180,6 +190,9 @@ case class NaNvl(left: Expression, right: Expression)
/**
* An expression that is evaluated to true if the input is null.
*/
+@ExpressionDescription(
+ usage = "_FUNC_(expr) - Returns true if the input is null",
+ extended = "> SELECT _FUNC_(null);\ntrue")
--- End diff --
Might want to add an example of the standard SQL "[val] IS NULL" syntax
here.
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