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

    https://github.com/apache/spark/pull/21025#discussion_r181299913
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
 ---
    @@ -287,3 +287,67 @@ case class ArrayContains(left: Expression, right: 
Expression)
     
       override def prettyName: String = "array_contains"
     }
    +
    +
    +/**
    + * Returns the minimum value in the array.
    + */
    +@ExpressionDescription(
    +  usage = "_FUNC_(array) - Returns the minimum value in the array.",
    --- End diff --
    
    We will ignore NULL, right? Please document it.


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