dragosmg commented on code in PR #12738:
URL: https://github.com/apache/arrow/pull/12738#discussion_r853972265
##########
r/R/dplyr-funcs-datetime.R:
##########
@@ -372,3 +372,50 @@ binding_format_datetime <- function(x, format = "", tz =
"", usetz = FALSE) {
build_expr("strftime", x, options = list(format = format, locale =
Sys.getlocale("LC_TIME")))
}
+
+binding_as_date <- function(x,
+ format = NULL,
+ tryFormats = "%Y-%m-%d",
+ origin = "1970-01-01",
+ tz = "UTC",
+ base = TRUE) {
+
+ if (is.null(format) && length(tryFormats) > 1) {
+ abort("`as.Date()` with multiple `tryFormats` is not supported in Arrow")
+ }
+
+ if (call_binding("is.Date", x)) {
+ return(x)
+
+ # cast from POSIXct
+ } else if (call_binding("is.POSIXct", x)) {
+ # base::as.Date() first converts to the desired timezone and then extracts
+ # the date, which is why we need to go through timestamp() first
+ if (base || !is.null(tz)) {
+ x <- build_expr("cast", x, options = cast_options(to_type =
timestamp(timezone = tz)))
+ }
Review Comment:
We run row 395 in 2 cases: either when we call `as.Date()` or when we call
`as_date()` and the user passes a value for `tz`. So the row is run both by the
`as.Date()` and `as_date()` bindings. It encapsulates the main difference
between the 2 functions when it comes to the treatment of `tz` (either passed
as argument or attribute of the `POSIXct` object)
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