Major Description
repartition: Returns a new [[Dataset]] that has exactly `numPartitions` partitions.
coalesce: Returns a new [[Dataset]] that has exactly `numPartitions` partitions. Similar to coalesce defined on an [[RDD]], this operation results in a narrow dependency, e.g. if you go from 1000 partitions to 100 partitions, there will not be a shuffle, instead each of the 100 new partitions will claim 10 of the current partitions.
