Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15045
Why bother saying 'specified' or 'default' at all though? it's probably
even more informative to state that HashPartitioner doesn't work, no matter
what the source. If the user specified HashPartitioner, that's clear. If they
didn't, they'll still recognize that the other half of the message is relevant:
some thing doesn't like their array keys.
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