Github user wangmiao1981 commented on the issue: https://github.com/apache/spark/pull/15421 By putting debug messages to [3] https://github.com/apache/spark/blob/d88a1bae6a9c975c39549ec2326d839ea93949b2/R/pkg/inst/worker/worker.R#L159 [4] https://github.com/apache/spark/blob/d88a1bae6a9c975c39549ec2326d839ea93949b2/R/pkg/inst/worker/worker.R#L78 Neither is called. I also put debug message on [1] https://github.com/apache/spark/blob/d88a1bae6a9c975c39549ec2326d839ea93949b2/R/pkg/R/context.R#L140 For > a <- as.Date(c("2016-11-11", "NA")) > b <- as.data.frame(a) > c <- createDataFrame(b > a [1] "2016-11-11" NA > b a 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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