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1. Spark, Scala - How to get Top 3 value from each group of two column in dataframe - Stack Overflow

   df.withColumn("rank", rank().over(Window.partitionBy("Dept_id").orderBy($"salary".desc)))
   .filter($"rank" <= 3)
   .drop("rank")

   2019-06-24 Tags: spark, scala, dataframe, top n, window, rank by klotz
2. scala - Dropping a nested column from Spark DataFrame - Stack Overflow

   2016-12-16 Tags: spark, scala, etl, column, dataframe by klotz

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