Github user titicaca commented on a diff in the pull request:
https://github.com/apache/spark/pull/16689#discussion_r98611766
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1138,6 +1138,11 @@ setMethod("collect",
if (!is.null(PRIMITIVE_TYPES[[colType]]) && colType !=
"binary") {
vec <- do.call(c, col)
stopifnot(class(vec) != "list")
+ class(vec) <-
+ if (colType == "timestamp")
+ c("POSIXct", "POSIXt")
--- End diff --
Because `PRIMITIVE_TYPES[["timestamp"]]` is POSIXct, it usually comes with
POSIXt together. POSIXt is virtual class used to allow operations such as
subtraction to mix the two classes POSIXct and POSIXlt.
The previous convertion will also convert timestamp to c("POSIXct",
"POSIXt").
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