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? ??? ??? MySQL ???? Spark RDD?? SQL? `ROW_NUMBER()` ??? ??????? ??? ??????

Spark RDD?? SQL? `ROW_NUMBER()` ??? ??????? ??? ??????

Dec 22, 2024 am 09:41 AM

How to Simulate SQL's `ROW_NUMBER()` Function in Spark RDD?

Spark RDD? ??? SQL ? ??

Spark?? SQL? row_number()? ??? ? ??? ????(partition by .. . order by ...) RDD? ?? Spark 1.4? ??? ??? ???? ??? ? ????. ??.

???:

  1. ??? RDD ??:
val sample_data = Seq(((3, 4), 5, 5, 5),
((3, 4), 5, 5, 9),
((3, 4), 7, 5, 5),
((1, 2), 1, 2, 3),
((1, 2), 1, 4, 7),
((1, 2), 2, 2, 3))

val temp1 = sc.parallelize(sample_data)
  1. ?? ???? ??:

Spark 1.4? ??? rowNumber() ??? ???? ??? ?? ????.

import org.apache.spark.sql.expressions.Window

val partitionedRdd = temp1
  .map(x => (x._1, x._2._1, x._2._2, x._2._3))
  .groupBy(_._1)
  .mapGroups((_, entries) =>
    entries.toList
      .sortBy(x => (x._2, -x._3, x._4))
      .zipWithIndex
      .map(x => (x._1._1, x._1._2, x._1._3, x._1._4, x._2 + 1))
  )
  1. ?? ??:
partitionedRdd.foreach(println)

// Example output:
// ((1,2),1,4,7,1)
// ((1,2),1,2,3,2)
// ((1,2),2,2,3,3)
// ((3,4),5,5,5,4)
// ((3,4),5,5,9,5)
// ((3,4),7,5,5,6)

? ??? Spark RDD?? SQL? `ROW_NUMBER()` ??? ??????? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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