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1. how to add leading zeroes to a pyspark dataframe column - Stack Overflow

   2021-04-21 Tags: pyspark, dataframe, string, number by klotz
2. Working with Spark DataFrame Map (MapType) column — SparkByExamples

   3.1 Getting all map Keys from DataFrame MapType column

   2021-02-18 Tags: spark, avro, dataframe, map by klotz
3. A Decent Guide to DataFrames in Spark 3.0 for Beginners | by David Vrba | Jan, 2021 | Towards Data Science

   2021-01-29 Tags: pyspark, pandas, dataframe, spark, spark 3.0, introduction by klotz
4. 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
5. sql - get TopN of all groups after group by using Spark DataFrame - Stack Overflow

   mport org.apache.spark.sql.expressions.Window
   import org.apache.spark.sql.functions.{rank, desc}
   
   val n: Int = ???
   
   // Window definition
   val w = Window.partitionBy($"user").orderBy(desc("rating"))
   
   // Filter
   df.withColumn("rank", rank.over(w)).where($"rank" <= n)

   2019-06-10 Tags: spark, topn, group, dataframe by klotz
6. scala - Querying Spark SQL DataFrame with complex types - Stack Overflow

   Try

   2017-10-18 Tags: spark, sql, dataframe, nested by klotz
7. Using stat.bloomFilter in Spark 2.0.0 to filter another dataframe

   2017-04-04 Tags: spark, dataframe, filter, join by klotz
8. 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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