LeaseExpiredException: No lease error on HDFS
August 23, 2021How to calculate median in Hive?
August 27, 2021Pretty simple. Use the except() to subtract or find the difference between two dataframes.
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Solution
except() will list the elements that are in dataframe 1 and not in dataframe 2. except() will still remove an element even if the element is listed multiple times in dataframe 1 and only once in dataframe 2.
import spark.implicits._ scala> val data1 = Seq(10, 20, 20, 30, 40) data1: Seq[Int] = List(10, 20, 20, 30, 40) scala> val data2 = Seq(20, 30) data2: Seq[Int] = List(20, 30) scala> val df1 = data1.toDF() df1: org.apache.spark.sql.DataFrame = [value: int] scala> val df2 = data2.toDF() df2: org.apache.spark.sql.DataFrame = [value: int] scala> df1.except(df2).show +-----+ |value| +-----+ | 40| | 10| +-----+ scala> df2.except(df1).show +-----+ |value| +-----+ +-----+
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