Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/16138#discussion_r97462770
--- Diff: R/pkg/R/functions.R ---
@@ -1730,24 +1730,82 @@ setMethod("toRadians",
#' to_date
#'
-#' Converts the column into DateType.
+#' Converts the column into DateType, optionally with a format. Returns
null if input is invalid.
--- End diff --
`Returns null if input is invalid.` - seems like this could confuse things
since the sql function we don't actually NULL - would the column contains NULL
value as a result? If so we should explain that here. Also, I'm pretty sure
null in JVM gets turn into `NA` in R, might want to check for this case.
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