Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/10795#issuecomment-172394248
I don't think that we should add this to the core RDD API itself. This
method is probably more useful / discoverable as part of one of the `ml` or
`mllib` subpackages. In addition, the implementation here is not more efficient
than what a user could write themselves (i.e. it's just syntactic sugar for ~
two lines of code).
If you'd still like to propose this change, please see the instructions at
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark and
follow the process for filing a JIRA.
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