Github user kiszk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21031#discussion_r180763490
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
 ---
    @@ -59,6 +60,36 @@ case class Size(child: Expression) extends 
UnaryExpression with ExpectsInputType
       }
     }
     
    +@ExpressionDescription(
    --- End diff --
    
    good catch, thanks


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