Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/16689
Oh @felixcheung , I was writing a comment but I just saw you. I was looking
into this for my curiosity.
Isn't this due to R type coercion rule with POSIXlt?
```r
> str(data.frame(col1 = c(as.POSIXct("2017-01-01 12:00:01"), NA)))
'data.frame': 2 obs. of 1 variable:
$ col1: POSIXct, format: "2017-01-01 12:00:01" NA
```
```r
> str(data.frame(col1 = c(NA, as.POSIXct("2017-01-01 12:00:01"))))
'data.frame': 2 obs. of 1 variable:
$ col1: num NA 1.48e+09
```
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