Github user nehabhardwaj01 commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1298#discussion_r136273861
--- Diff: integration/spark-common/src/main/scala/org/apache/carbondata/spark/util/CommonUtil.scala ---
@@ -347,7 +347,7 @@ object CommonUtil {
sys.error("The size of new list must be smaller than original list, please check again!")
}
val tempList = newListInfo.mkString(",").split(",")
--- End diff --
Actually, the List on which these functions are being performed stores values as a List[String]
Suppose the list has the following values: ('Korea', 'China', '(Japan, US, Africa)' , 'UK')
Without applying any function the list elements will be :
list(0) => Korea
list(1) => China
list(2) => (Japan, US, Africa) //This list of elements is stored like a string
list(3) => UK
But When we perform list.mkString(",").split(",")
The list now have every element as individual value
list(0) => Korea
list(1) => China
list(2) => (Japan
list(3) => US
list(4) => Africa)
list(5) => UK
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