[GitHub] spark pull request: [SPARK-12462][SQL] Add ExpressionDescription t...

[frreiss <gi...@git.apache.org>]

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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