Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16605
Well, it will be good if we can support `Array` in `ScalaUDF`, but it's not
a big deal as users can easily do `udf { (seq: Seq[Int]) => val a =
seq.toArray; // do anything you like with the array }`.
considering the size of this PR, I don't think it worth.
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