如何对Java中的列组合对火花数据框进行排序？

Question

I have a spark data frame in Java, something like below:

I want it to be sorted based on "Col3" but all the values of Col1 and Col2 should be in a group. The result should be something like below:

Answer 1

The groupBy() function is used during aggregation while your requirement just requires orderBy()

Assuming dataframe df with 3 columns Col1, Col2, Col3, you can do the below in Spark

val sortedDf = df.orderBy(col("Col1").desc,col("Col2").desc,col("Col3").asc)

POC for the same is available here SQLFIDDLE