Github user maropu commented on the issue:
https://github.com/apache/spark/pull/16605
The workaround @cloud-fan said is good to me though, IMO the most critical
issue here is that this cast exception happens not in analysis phases but in
runtime. So, at least I think we should modify code to throw an exception in
analysis phases and the exception might include a message like "you should use
`Seq[T]` instread of `Array[T]`". I think we could do this with less amount of
code. Thought?
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