dragosmg commented on a change in pull request #12707:
URL: https://github.com/apache/arrow/pull/12707#discussion_r837850177
##########
File path: r/R/dplyr-funcs-datetime.R
##########
@@ -300,6 +314,34 @@ register_bindings_duration <- function() {
build_expr("cast", x, options = cast_options(to_type = duration(unit =
"s")))
})
+ register_binding("decimal_date", function(date) {
+ y <- build_expr("year", date)
+ start <- call_binding("make_datetime", year = y, tz = "UTC")
+ sofar <- call_binding("difftime", date, start, units = "secs")
+ total <- call_binding(
+ "if_else",
+ build_expr("is_leap_year", date),
+ call_binding("as.integer64", 31622400L), # number of seconds in a leap
year (366 days)
+ call_binding("as.integer64", 31536000L) # number of seconds in a
regular year (365 days)
+ )
+ y + sofar$cast(int64()) / total
+ })
+ register_binding("date_decimal", function(decimal, tz = "UTC") {
+ y <- build_expr("floor", decimal)
+
+ start <- call_binding("make_datetime", year = y, tz = tz)
+ seconds <- call_binding(
+ "if_else",
+ build_expr("is_leap_year", start),
+ call_binding("as.integer64", 31622400L), # number of seconds in a leap
year (366 days)
+ call_binding("as.integer64", 31536000L) # number of seconds in a
regular year (365 days)
+ )
Review comment:
https://issues.apache.org/jira/browse/ARROW-16066
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