Github user wangmiao1981 commented on the issue:
https://github.com/apache/spark/pull/15421
I print out binary of serialized data before sending and the bytes sent by
R side. They are the same. I also called `unserialize` after serialization on R
side. It deserializes successfully.
So `list(NA)` should have a special handling for serialization on R side.
From R source code, I didn't get the point.
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