Github user kmadhugit commented on the pull request:
https://github.com/apache/spark/pull/7020#issuecomment-117240603
I think I understood, in case of non-join operations like reduceByKey we
would be silently switching the default partitioner which could change the
answers..
In that case we can modify the default partitioner only when number of RDDs
passed to defaultParatitioner() is > 1.
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