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

    https://github.com/apache/flink/pull/1975#discussion_r83316946
  
    --- Diff: 
flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/KeyedStream.scala
 ---
    @@ -224,45 +224,95 @@ class KeyedStream[T, K](javaStream: 
KeyedJavaStream[T, K]) extends DataStream[T]
       /**
        * Applies an aggregation that that gives the current minimum element of 
the data stream by
        * the given position by the given key. An independent aggregate is kept 
per key. 
    -   * When equality, the first element is returned with the minimal value.
    +   * When equality, the first element is returned with the minimal value 
by default.
        *
        */
       def minBy(position: Int): DataStream[T] = aggregate(AggregationType
    -    .MINBY, position)
    -    
    -   /**
    +    .MINBY, position, true)
    +
    +  /**
        * Applies an aggregation that that gives the current minimum element of 
the data stream by
    -   * the given field by the given key. An independent aggregate is kept 
per key.
    -   * When equality, the first element is returned with the minimal value.
    +   * the given position by the given key. An independent aggregate is kept 
per key. 
    +   * When equality, returns either the first or last one depending on the 
parameter setting.
    +   *
    +   */
    +  def minBy(position: Int, first: Boolean): DataStream[T] = 
aggregate(AggregationType
    --- End diff --
    
    Please add `@PublicEvolving` to new public methods.


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