[GitHub] spark pull request #13967: [SPARK-16278][SPARK-16279][SQL] Implement map_key...

[dongjoon-hyun <gi...@git.apache.org>]

Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13967#discussion_r69231662
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
    @@ -2753,6 +2753,22 @@ object functions {
       def size(e: Column): Column = withExpr { Size(e.expr) }
     
       /**
    +   * Returns the key array of the map.
    +   *
    +   * @group collection_funcs
    +   * @since 2.1.0
    +   */
    +  def map_keys(e: Column): Column = withExpr { MapKeys(e.expr) }
    --- End diff --
    
    I see. Thank you for confirming!


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