Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22889
I think the problem is real, maybe we should not use `Seq` in the end-user
API, but always use Array to be more Java-friendly. This can also avoid bugs
like https://github.com/apache/spark/pull/22789
cc @rxin @hvanhovell what do you think?
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