Github user anabranch commented on a diff in the pull request:
https://github.com/apache/spark/pull/16138#discussion_r97470513
--- 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 --
Take a look at the next push, I think that this will resolve it. Because
this is not an action I don't think it's relevant to define what will happen
when the data is collected. That is already documented according to how the
types line up with one another.
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