Spark Dataframe :How to add a index Column : Aka Distributed Data Index

Question

I read data from a csv file ,but don\'t have index.

I want to add a column from 1 to row\'s number.

What should I do,Thanks (scala)

Answer 1

For SparkR:

(Assuming sdf is some sort of spark data frame)

sdf<- withColumn(sdf, "row_id", SparkR:::monotonically_increasing_id())