thisisnic commented on a change in pull request #10507:
URL: https://github.com/apache/arrow/pull/10507#discussion_r655221384
##########
File path: r/R/dplyr-functions.R
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@@ -442,3 +442,37 @@ nse_funcs$strptime <- function(x, format = "%Y-%m-%d
%H:%M:%S", tz = NULL, unit
Expression$create("strptime", x, options = list(format = format, unit =
unit))
}
+
+nse_funcs$wday <- function(x, label = FALSE, abbr = TRUE, week_start =
getOption("lubridate.week.start", 7)) {
+ if (label) {
+ arrow_not_supported("Label argument")
Review comment:
The label argument allows the return of the day of the week in the
correct language.
In `lubridate`, there's a whole lot of work around defining the locale and
then setting the weekday names appropriately, though essentially, it just uses
the format function to extract the relevant date.
I think that we wouldn't want to implement this at the C++ level as it
doesn't feel like it fits there as it's doing quite a lot more work than
calculating a value, (i.e. returning locale-specific dates), and we could still
achieve this with good performance at the R level by implementing this
functionality using the ifelse kernel once its R bindings are implemented.
How about if I leave it as unsupported now, but create a ticket to implement
it later, that lists the ifelse R binding as a dependency?
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