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

    https://github.com/apache/spark/pull/21031#discussion_r181344225
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
    @@ -3282,6 +3282,14 @@ object functions {
        */
       def size(e: Column): Column = withExpr { Size(e.expr) }
     
    +  /**
    +   * Returns length of array or map as BigInt.
    --- End diff --
    
    Good catch, thanks


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