Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21698
> Given this, there is no ambiguity in cardinality of zip().map() ... which
two tuples from rdd1 and rdd2 get zip'ed together can be arbitrary : and I
agree about that.
yes, but the following `.groupByKey().map()` has ambiguity in cardinality
because the tulples get zipped can be arbitrary, isn't it?
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