Github user kmadhugit commented on the pull request:
https://github.com/apache/spark/pull/7020#issuecomment-117213182
On other hand if we keep current behavior for any group operation not just
join alone, it would silent truncate the results which would unexpected. I'm
very new to SPARK, I could be missing something here, but I feel RDD with zero
number partitions should behave similar to empty RDD in all group operations.
Since default_paritioner is called via cogroup it should be okay to not to
select user defined partitioner for result RDD.
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