Github user wangmiao1981 commented on the issue:
    By putting debug messages to 
    Neither is called.
    I also put debug message on
    > a <- as.Date(c("2016-11-11", "NA"))
    > b <-
    > c <- createDataFrame(b
    > a
    [1] "2016-11-11" NA          
    > b
    1 2016-11-11
    2       <NA>
    `slices` that is in lapply is:
    slice list(17116) slice list(NA)
    `"2016-11-11"` becomes `17116` and `"NA"` is `NA`.

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