如何在 spark scala 中获取 groupby 的 output 如下

Question

After running groupby i got the result as

+--------------------+-----+
|                City|count|
+--------------------+-----+
|               Tyler|    2|
|           Fairbanks|    1|
|         Springfield|   12|
|          Charleston|    7|
|              Corona|    2|

I want the same result as below

Tyler : 2
Fairbanks : 1
Springfield : 12

I have to do it in scala spark.. not pysaprk

Answer 1

This question is a bit unclear. Please add more data like how your are printing the first output (putting the code will help). Rest, based on output I can think of you are just taking some values from RDD and printing on console with default println. If thats the case, try mapping the data based on your output requirement and then use.mkstring("\n") over it. So pseudo code will look like

collectedResult.map(x=>s"${x._1}: ${x._2}").mkString("\n")

Note: this is just an example may not run just like that in editor. Also if the size of result is too big, this approach is not at all recommended.