Github user wangmiao1981 commented on the issue:
    Last night, I debugged the problem again. Now I can reproduce it as follows:
    >  a <- as.Date("2016-10-01", "NA")
    > b <-
    > c <- createDataFrame(b)
    > a
    [1] NA
    > b
    1 <NA>
     I compared with the working case. R side function calls are the same for 
both cases and data type inferences are correct. R side writes data as `raw` 
type and the backend encounters problem when casting the byte stream based on 
    I continue debugging it now and hope to find the cause of why reading bytes 
to date type fails.
    For the above example, I don't know why "2016-10-01" is missed after 
`as.Date`. But based on my debug message, the number of args and value (`NA`) 
are correctly represented on R side before serialization.

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