Sun Rui created SPARK-15521:
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             Summary: Add high level APIs based on dapply and gapply for easier 
usage
                 Key: SPARK-15521
                 URL: https://issues.apache.org/jira/browse/SPARK-15521
             Project: Spark
          Issue Type: Sub-task
          Components: SparkR
            Reporter: Sun Rui


dapply() and gapply() of SparkDataFrame are two basic functions. For easier 
usage to users in the R community, some high level functions can be added based 
on them.

Candidates are:
http://exposurescience.org/heR.doc/library/heR.Misc/html/dapply.html
http://exposurescience.org/heR.doc/library/stats/html/aggregate.html




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