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klotz: window* + partition*

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1. Introducing Window Functions in Spark SQL - The Databricks Blog

   2018-03-27 Tags: spark, partition, window by klotz
2. 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

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