Github user cenyuhai commented on the issue:
https://github.com/apache/spark/pull/14737
@srowen Why I set this value 2, because a "JOIN" action needs 2
elements.Because Users always don't care about how many partitions the graphs
has, they just want to know the relations from DAG graphs. I have changed the
codes as @markhamstra said, it will not remove elements by default. Users can
set this value as they like. But I recommend that 2 is better.
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