Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/15097
@felixcheung
it is the case when r-side pass an empty array and scala-side parameter
type is Array[T] then there is some problem (as the TODO described in
serialize.R: 166 line)...but passing an empty array as an parameter is rarely
used, so I consider close this PR for now, thanks!
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