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1. apache spark - Adding a group count column to a PySpark dataframe - Stack Overflow

   2021-04-21 Tags: spark, pyspark, groupby, count, window, .spark sql by klotz
2. 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
3. Introducing Window Functions in Spark SQL - The Databricks Blog

   2018-03-27 Tags: spark, partition, window by klotz
4. Does Spark know the partitioning key of a DataFrame? - Stack Overflow

   I confirm that when I do window functions on df2 partitioned by userid there is no shuffle! Thanks @user8371915!

   2018-03-27 Tags: spark, window, partition by klotz
5. scala - How to get a single row with the maximum value while keeping the whole row? - Stack Overflow

   val w = Window.partitionBy($"id")
   val df2 = df.withColumn("maxCharge", max("charge").over(w))
   .filter($"maxCharge" === $"charge")
   .drop("charge")
   .withColumnRenamed("maxCharge", "charge")

   2018-03-27 Tags: spark, window, howto by klotz

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