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

    https://github.com/apache/spark/pull/21037#discussion_r181283242
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
 ---
    @@ -287,3 +287,61 @@ case class ArrayContains(left: Expression, right: 
Expression)
     
       override def prettyName: String = "array_contains"
     }
    +
    +/**
    + * A function that returns the position of the first occurrence of element 
in the given array
    + * as long. Returns 0 if substr could not be found in str.
    + * Returns null if either of the arguments are null and
    --- End diff --
    
    Good catch, thanks


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