Github user wangmiao1981 commented on the issue:

    https://github.com/apache/spark/pull/15421
  
    I modified the code on `readString`. When len is negative, I read 3 bytes. 
`NA` is read on scala side, which is correct field value. But the integer of 
len is not serialized. It seems that R side serialization doesn't add length 
for `NA`. I am debugging R side now.  


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