Github user davies commented on the pull request:
https://github.com/apache/spark/pull/1977#issuecomment-52384600
@sryza There are similar things in Scala, but we can not compare the Python
object in Scala, so it can not use the groupByKey() in Scala directly. All the
aggregation should be implemented in Python also.
@andrewor14, I hope PySpark could catch up with Scala.
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