Github user shivaram commented on the issue:

    https://github.com/apache/spark/pull/15421
  
    Thanks - the lines in [3], [4] will be called if we do any operation on the 
DataFrame. i.e. something like `dim(c)`. Also can we use the same test case 
that is in the test file checked in ?
    ```
     df <- data.frame(id = 1:2,
       date = c(as.Date("2016-10-01"), NA))
    DF <- collect(createDataFrame(df))
    is.na(DF$date[2]) # should be TRUE
    ```


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