Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/15097
@shivaram
Oh...I found this way still has problems, Array[Nothing] in scala, after
compiling with type erasing, at last it turned into type `Ljava.lang.object`,
but primitive type Array such as Array[Int] after compile turned into `[I` so
the two type still not compatible...
Now I am thinking about another way, when R-side we pass an array with zero
length, scala/java side regard it as `null` value, so it can be assigned to any
type parameter.
A typical scenario of this problem is, we want to pass an array type
parameter from R-side, but sometime we only want to pass `null` array to
indicate we want to use the default parameter value.
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